# Cessna 421

- Type: Aircraft model (FAA registry)
- Registry code: 2076010
- Manufacturer (registry): CESSNA
- Model: 421
- Aircraft type: Fixed wing multi engine
- Category: Airplane
- Engines: 2 · Reciprocating
- Seats: 8
- Weight class: Up to 12,499 lb
- Cruise speed: 172 mph
- Certification: Type certificated
- Data sheet: [TCDS A7CE](https://openairdocs.org/tcds/A7CE) (OpenAirDocs)
- Holder: Textron Aviation Inc.
- Registered aircraft: 28
- Page: https://openairdocs.org/model/cessna-421

Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker.

## ADs that may apply (OpenAirDocs)

Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

- [AD 2023-09-09](https://openairdocs.org/ad/2023-09-09): Exhaust Turbine System (Recip) · Aerostar PA-60-600 (Aerostar 600), PA-60-601 (Aerostar 601), PA-60-601P (Aerostar 601P) and 292 more. Effective Jul 17, 2023
- [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023
- [AD 2018-03-03 R1](https://openairdocs.org/ad/2018-03-03-R1): Fuselage · Textron 401, 401A, 401B and 13 more. Effective May 23, 2018
- [AD 2016-17-08](https://openairdocs.org/ad/2016-17-08): Elevator Tab Control System · Textron 310, 310A, 310B and 46 more. Effective Sep 12, 2016
- [AD 2014-03-03](https://openairdocs.org/ad/2014-03-03): Placards and Markings · Cessna 310, 310A, 310B and 37 more. Effective Apr 7, 2014
- [AD 2005-20-25](https://openairdocs.org/ad/2005-20-25): Avionics bus circuit breaker switches · Cessna 401, 401A, 401B and 15 more. Effective Nov 9, 2005
- [AD 2005-18-20](https://openairdocs.org/ad/2005-18-20): "FASTprop" propeller de-icers · Hartzell PHC-C3YF-1RF/F8468A(B,K)-8R constant speed propeller (STC SA00718LA or 17 others). Effective Oct 14, 2005
- [AD 2004-25-16 R1](https://openairdocs.org/ad/2004-25-16-R1): Fuel regulator shutoff valve · Bombardier CL-215-1A10, CL-215-6B11 (CL-215T Variant), CL-215-6B11 (CL-415 Variant) and 64 more. Effective Jun 20, 2005
- [AD 2005-01-19](https://openairdocs.org/ad/2005-01-19): Mode S transponders · GARMIN International GTX 330D, GTX 330, GTX 33D and 830 more. Effective Feb 23, 2005
- [AD 2004-21-05](https://openairdocs.org/ad/2004-21-05): B-Seires Combustion Heaters · Bombardier CL-215-1A10, CL-215-6B11 (CL-215T Variant), CL-215-6B11 (CL-415 Variant) and 41 more. Effective Nov 19, 2004
- [AD 2004-08-15](https://openairdocs.org/ad/2004-08-15): TAWS8000 terrain awareness warning systems (TAWS) · Cessna 421, 500, 501 and 18 more. Effective Jun 7, 2004
- [AD 2000-01-16](https://openairdocs.org/ad/2000-01-16): Exhaust System · Cessna 320, 320-1, 320A and 28 more. Effective Feb 15, 2000
- [AD 98-25-02](https://openairdocs.org/ad/98-25-02): Top-mounted Antenna · Bell Helicopter Textron Canada 407, 172, 172A and 243 more. Effective Dec 22, 1998
- [AD 98-14-03](https://openairdocs.org/ad/98-14-03): Transponders · Cessna 172, 172A, 172B and 230 more. Effective Aug 16, 1998
- [AD 97-01-13](https://openairdocs.org/ad/97-01-13): Fuel, Oil and Hydraulic Hoses · Cessna 150, 150A, 150B and 232 more. Effective Feb 3, 1997
- [AD 96-12-22](https://openairdocs.org/ad/96-12-22): Full Flow Engine Oil Adapter · Bellanca CH-300 Pacemaker, 120, 140 and 361 more. Effective Jul 31, 1996
- [AD 92-16-18](https://openairdocs.org/ad/92-16-18): Passenger Seat Reinforcement · Cessna 401, 402, 402A and 9 more. Effective Sep 10, 1992
- [AD 90-02-13](https://openairdocs.org/ad/90-02-13): Main Landing Gear · Cessna 310, 310A, 310B and 40 more. Effective Feb 5, 1990
- [AD 87-21-02 R1](https://openairdocs.org/ad/87-21-02-R1): Fuel Filler Openings · Cessna 310D, 310E, 310F and 41 more. Effective Jun 16, 1989
- [AD 76-08-02 R2](https://openairdocs.org/ad/76-08-02-R2): Wing Tip Nose Cap · Cessna 310, 310A, 310B and 41 more. Effective Jan 31, 1983
- [AD 72-14-08 R1](https://openairdocs.org/ad/72-14-08-R1): Flexible Hose Assemblies · Cessna 310, 310A, 310B and 33 more. Effective Sep 4, 1981
- [AD 78-13-05](https://openairdocs.org/ad/78-13-05): Improperly Installed Seats · Cessna 340, 340A, 402B and 7 more. Effective Jul 5, 1978
- [AD 78-05-06](https://openairdocs.org/ad/78-05-06): Flexible Fuel Cells · Cessna 180, 182, 185 and 98 more. Effective Jun 30, 1978
- [AD 73-22-01](https://openairdocs.org/ad/73-22-01): Fuel In Wing Leading Edge · Cessna 340, 401, 401A and 11 more. Effective May 29, 1978
- [AD 76-13-07](https://openairdocs.org/ad/76-13-07): Fork Bolts · Cessna 401, 401A, 401B and 11 more. Effective Jul 7, 1976
- [AD 72-11-05](https://openairdocs.org/ad/72-11-05): Auxiliary Fuel Cell Leaks · Cessna 411, 411A, 421 and 3 more. Effective Jun 2, 1972
- [AD 72-03-07](https://openairdocs.org/ad/72-03-07): Landing Gear Failure · Cessna 310, 310A, 310B and 30 more. Effective Feb 9, 1972
- [AD 72-02-01](https://openairdocs.org/ad/72-02-01): Propeller Attachment Nuts · Cessna 411, 411A, 421 and 2 more. Effective Jan 18, 1972
- [AD 69-14-01](https://openairdocs.org/ad/69-14-01): Fuel Starvation · Cessna 310G, 310H, 310I and 22 more

Historical (superseded or no longer in force):

- [AD 2018-03-03](https://openairdocs.org/ad/2018-03-03) (historical): Fuselage · Textron 401, 401A, 401B and 13 more. Effective Feb 28, 2018
- [AD 2016-07-24](https://openairdocs.org/ad/2016-07-24) (historical): Elevator Tab Control System · Textron 310, 310A, 310B and 46 more. Effective Apr 26, 2016

## Information bulletins (advisory) (13)

- [SAIB CE-13-27R1](https://openairdocs.org/saib/CE-13-27R1): Flight Controls  Frayed Flap Extend Cables. Issued Jan 5, 2022
- [SAIB AIR-21-20](https://openairdocs.org/saib/AIR-21-20): TE FLAP CONTROL SYSTEM, Flight Controls –Flap Cable Tension. Issued Dec 16, 2021
- [SAIB CE-14-11R1](https://openairdocs.org/saib/CE-14-11R1): Landing Gear; Nose Landing Gear Trunnions. Issued Sep 23, 2015
- [SAIB CE-14-19](https://openairdocs.org/saib/CE-14-19): Landing Gear; Main Landing Gear (MLG) Torque Link. Issued May 30, 2014
- [SAIB CE-14-11](https://openairdocs.org/saib/CE-14-11) (historical): Landing Gear; Nose Landing Gear Trunnions. Issued Feb 25, 2014
- [SAIB CE-13-22](https://openairdocs.org/saib/CE-13-22): Electrical Power System  Circuit Breaker Switch. Issued Mar 13, 2013
- [SAIB CE-10-01](https://openairdocs.org/saib/CE-10-01): Fuel: Fuel Tank Selector Valve Systems. Issued Oct 5, 2009
- [SAIB CE-09-16](https://openairdocs.org/saib/CE-09-16): Landing Gear: Main Landing Gear Torque Tube. Issued Mar 3, 2009
- [SAIB CE-06-46R1](https://openairdocs.org/saib/CE-06-46R1): . Issued Sep 18, 2006
- [SAIB CE-03-41](https://openairdocs.org/saib/CE-03-41): . Issued Jun 27, 2003
- [SAIB ACE-99-06](https://openairdocs.org/saib/ACE-99-06): . Issued Nov 17, 1998
- [SAIB ACE-99-05](https://openairdocs.org/saib/ACE-99-05): . Issued Nov 17, 1998
- [SAIB ACE-96-05](https://openairdocs.org/saib/ACE-96-05): . Issued Oct 1, 1996

## Registered aircraft (28)

- [N100JL](https://openairdocs.org/aircraft/N100JL): [Bytelogics Inc](https://openairdocs.org/faa-owner/BYTELOGICS%20INC), [New York, NY](https://openairdocs.org/faa-place/NY/New%20York), S/N 421-0008
- [N1027D](https://openairdocs.org/aircraft/N1027D): [Robins Jack S](https://openairdocs.org/faa-owner/ROBINS%20JACK%20S), [Saint Charles, ID](https://openairdocs.org/faa-place/ID/Saint%20Charles), built 1968, S/N 421-0196
- [N12KN](https://openairdocs.org/aircraft/N12KN): [Jane Air LLC](https://openairdocs.org/faa-owner/JANE%20AIR%20LLC), [Kalamazoo, MI](https://openairdocs.org/faa-place/MI/Kalamazoo), built 1968, S/N 421-0130
- [N1421U](https://openairdocs.org/aircraft/N1421U): [Aviation Services Of Tn Inc](https://openairdocs.org/faa-owner/AVIATION%20SERVICES%20OF%20TN%20INC), [Sparta, TN](https://openairdocs.org/faa-place/TN/Sparta), built 1967, S/N 421-0046
- [N18T](https://openairdocs.org/aircraft/N18T): [N18t Ltd](https://openairdocs.org/faa-owner/N18T%20LTD), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1968, S/N 421-0144
- [N25FE](https://openairdocs.org/aircraft/N25FE): [Round Trip Lc](https://openairdocs.org/faa-owner/ROUND%20TRIP%20LC), [Elkhart, KS](https://openairdocs.org/faa-place/KS/Elkhart), S/N 421-0055
- [N269F](https://openairdocs.org/aircraft/N269F): [Air2615 LLC](https://openairdocs.org/faa-owner/AIR2615%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1968, S/N 421-0177
- [N285N](https://openairdocs.org/aircraft/N285N): [Totem Air Inc](https://openairdocs.org/faa-owner/TOTEM%20AIR%20INC), [Seattle, WA](https://openairdocs.org/faa-place/WA/Seattle), built 1968, S/N 421-0169
- [N318TW](https://openairdocs.org/aircraft/N318TW): [Flg Air Transport LLC](https://openairdocs.org/faa-owner/FLG%20AIR%20TRANSPORT%20LLC), [Miramar, FL](https://openairdocs.org/faa-place/FL/Miramar), S/N 421-0170
- [N4070L](https://openairdocs.org/aircraft/N4070L): [Desert Air LLC](https://openairdocs.org/faa-owner/DESERT%20AIR%20LLC), [Hagerman, NM](https://openairdocs.org/faa-place/NM/Hagerman), built 1968, S/N 421-0070
- [N4074L](https://openairdocs.org/aircraft/N4074L): [Eminent Technology](https://openairdocs.org/faa-owner/EMINENT%20TECHNOLOGY), [Tallahassee, FL](https://openairdocs.org/faa-place/FL/Tallahassee), built 1968, S/N 421-0074
- [N421BV](https://openairdocs.org/aircraft/N421BV): [Wichita, KS](https://openairdocs.org/faa-place/KS/Wichita), built 1968, S/N 421-0064, Registration pending, pending cancellation
- [N421DN](https://openairdocs.org/aircraft/N421DN): [Del Mar College](https://openairdocs.org/faa-owner/DEL%20MAR%20COLLEGE), [Corpus Christi, TX](https://openairdocs.org/faa-place/TX/Corpus%20Christi), built 1968, S/N 421-0146
- [N421MR](https://openairdocs.org/aircraft/N421MR): [Quest Aviation Inc](https://openairdocs.org/faa-owner/QUEST%20AVIATION%20INC), [Lake City, FL](https://openairdocs.org/faa-place/FL/Lake%20City), built 1968, S/N 421-0112
- [N421MW](https://openairdocs.org/aircraft/N421MW): [Rice Melvin Gaylon](https://openairdocs.org/faa-owner/RICE%20MELVIN%20GAYLON), [Bridgeport, TX](https://openairdocs.org/faa-place/TX/Bridgeport), built 1968, S/N 421-0058
- [N421RD](https://openairdocs.org/aircraft/N421RD): [Munn Laurie P](https://openairdocs.org/faa-owner/MUNN%20LAURIE%20P), [Bellflower, CA](https://openairdocs.org/faa-place/CA/Bellflower), built 1968, S/N 421-0157
- [N421RR](https://openairdocs.org/aircraft/N421RR): [Blue Star Aviation LLC](https://openairdocs.org/faa-owner/BLUE%20STAR%20AVIATION%20LLC), [Billings, MT](https://openairdocs.org/faa-place/MT/Billings), built 1968, S/N 4210085
- [N421Z](https://openairdocs.org/aircraft/N421Z): [Xxx, OK](https://openairdocs.org/faa-place/OK/Xxx), built 1968, S/N 421-0077, Sale reported
- [N4572L](https://openairdocs.org/aircraft/N4572L): [Fiegel Donald H](https://openairdocs.org/faa-owner/FIEGEL%20DONALD%20H), [Ward, AR](https://openairdocs.org/faa-place/AR/Ward), built 1968, S/N 421-0172
- [N4AF](https://openairdocs.org/aircraft/N4AF): [N4af LLC](https://openairdocs.org/faa-owner/N4AF%20LLC), [Conroe, TX](https://openairdocs.org/faa-place/TX/Conroe), built 1968, S/N 421-0142
- [N52JR](https://openairdocs.org/aircraft/N52JR): [Ag Tech Farm Services](https://openairdocs.org/faa-owner/AG%20TECH%20FARM%20SERVICES), [Gamaliel, KY](https://openairdocs.org/faa-place/KY/Gamaliel), built 1968, S/N 421-0197
- [N577SW](https://openairdocs.org/aircraft/N577SW): [Air Plains Services Corp](https://openairdocs.org/faa-owner/AIR%20PLAINS%20SERVICES%20CORP), [Wellington, KS](https://openairdocs.org/faa-place/KS/Wellington), S/N 421-0023
- [N5874C](https://openairdocs.org/aircraft/N5874C): [Vola Acosta LLC](https://openairdocs.org/faa-owner/VOLA%20ACOSTA%20LLC), [Lake Forest, CA](https://openairdocs.org/faa-place/CA/Lake%20Forest), S/N 421C0882
- [N5CH](https://openairdocs.org/aircraft/N5CH): [Hartshorn William T](https://openairdocs.org/faa-owner/HARTSHORN%20WILLIAM%20T), [Tucson, AZ](https://openairdocs.org/faa-place/AZ/Tucson), built 1968, S/N 421-0113
- [N62DW](https://openairdocs.org/aircraft/N62DW): [Sagamore Sky LLC](https://openairdocs.org/faa-owner/SAGAMORE%20SKY%20LLC), [Jericho, NY](https://openairdocs.org/faa-place/NY/Jericho), S/N 4210188
- [N68WA](https://openairdocs.org/aircraft/N68WA): [Chuss Edward J](https://openairdocs.org/faa-owner/CHUSS%20EDWARD%20J), [Metamora, MI](https://openairdocs.org/faa-place/MI/Metamora), built 1968, S/N 421-0137
- [N70DC](https://openairdocs.org/aircraft/N70DC): [Arcadia, CA](https://openairdocs.org/faa-place/CA/Arcadia), built 1968, S/N 421-0103, Sale reported
- [N863CP](https://openairdocs.org/aircraft/N863CP): [Net Quest Management Services LLC](https://openairdocs.org/faa-owner/NET%20QUEST%20MANAGEMENT%20SERVICES%20LLC), [Winter Haven, FL](https://openairdocs.org/faa-place/FL/Winter%20Haven), built 1968, S/N 421-0117

## STCs approved for it (263, first 50)

- [STC SA00057SE](https://openairdocs.org/stc/SA00057SE): Installation of emergency medical stretcher, oxygen, and electrical systems.. LifePort LLC
- [STC SA00061LA](https://openairdocs.org/stc/SA00061LA): Installation of JPI digital tachometer.. J P Instruments
- [STC SA00068SE](https://openairdocs.org/stc/SA00068SE): Installation of fuel flow/pressure instruments. (W/TSIO-360-MB1). Electronics International Inc.
- [STC SA00079NY](https://openairdocs.org/stc/SA00079NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K008 on single and multi engine fixed wing light aircraft incorporating Teledyne Continental reciprocating engines of 450 horsepower or less.. Airwolf Filter Corporation
- [STC SA00103WI](https://openairdocs.org/stc/SA00103WI): Installation of a heated windshield panel. Aviation Fabricators Inc
- [STC SA00149BO](https://openairdocs.org/stc/SA00149BO): Installation of Aircraft Components, Inc. Volt and Vac Alert System, P/N 2044-1. Aircraft Components Inc
- [STC SA00161BO (2 OF 3](https://openairdocs.org/stc/SA00161BO%20(2%20OF%203): Installation of Avidyne Corporation FlightMax 700-00007-( ) EX500 Multi-Function Display.. Avidyne Corporation
- [STC SA00165BO](https://openairdocs.org/stc/SA00165BO): Installation of Avidyne Corporation Datalink Coupler, part number 700-00015-000 per Avidyne Corporation Master Document List, Document No. AVACP-006 dtd 1/2/93 or later FAA-approved revisions.. Avidyne Corporation
- [STC SA00228NY](https://openairdocs.org/stc/SA00228NY): Installation of Sky Harbour Aircraft Refinishing Ltd Ice Damage Prevention Plates.. Sky Harbour Aircraft Refinishing
- [STC SA00243BO (3 OF 5)](https://openairdocs.org/stc/SA00243BO%20(3%20OF%205)): Installation of Centurion Consulting, Inc. GPS Steering Assist Module (SAM) with roll steering (p/n 0025-5100), or without roll steering (p/n 0025-5200).. Icarus Avionics, LLC
- [STC SA00269BO](https://openairdocs.org/stc/SA00269BO): Installation of Avidyne Corporation TWX 670 Tactical Weather Detection System P/N 850-00026-000-( ) consisting of Avidyne Processor P/N 700-00033-000-( ), Sensor Systems Inc. Antenna P/N S72-1715-1 with doubler plate P/N S72-171530-1, and Avidyne Mounting Tray P/N 700-00034-000.. Avidyne Corporation
- [STC SA00281BO](https://openairdocs.org/stc/SA00281BO): Installation of Avidyne Corporation MLX770 MultiLink Broadcast Transceiver P/N 700-00163-( ), Sensor Systems Inc. Antenna P/N S67-1575-109, or equivalent, and optional Avidyne Mounting Tray P/N 700-00165-000. Avidyne Corporation
- [STC SA00290BO](https://openairdocs.org/stc/SA00290BO): Installation of Avidyne Corporation Part Number  700-00167-XXX Multi-Function Display and Mounting Tray Assembly Part Number 700-00168-XXX. Avidyne Corporation
- [STC SA00308WI](https://openairdocs.org/stc/SA00308WI): Installation of replacement wing rear spar caps. Callahan Aircraft Services
- [STC SA00329SE](https://openairdocs.org/stc/SA00329SE): Installation of vortex generators on wings and vertical stabilizer.. Aeronautical Testing Service Inc.
- [STC SA00343BO](https://openairdocs.org/stc/SA00343BO): Installation of a single configuration or a dual configuration Avidyne Corporation Integrated Flight Display, Model IFD540 loaded with Release 10.0 software (or later FAA approved release). Avidyne Corporation
- [STC SA00344BO PAGE 1](https://openairdocs.org/stc/SA00344BO%20PAGE%201): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights.. Whelen Aerospace Technologies
- [STC SA00352BO PAGE 1](https://openairdocs.org/stc/SA00352BO%20PAGE%201): Installation of an Avidyne Corporation Mode A/C/S Transponder with ADS-B Out capability, Model AXP340 loaded with Version 3.13 software (or later FAA approved version),. Avidyne Corporation
- [STC SA00404WI](https://openairdocs.org/stc/SA00404WI): Installation of a starter engagement indication system.. Miller Aviation, Inc
- [STC SA00419NY](https://openairdocs.org/stc/SA00419NY): Installation of cockpit utility light.. Burns Richard G
- [STC SA00432SE](https://openairdocs.org/stc/SA00432SE): Installation of EGT 701 series fuel flow instrument.. J P Instruments
- [STC SA00537SE](https://openairdocs.org/stc/SA00537SE): Installation of vortex generators on the wing and rudder surfaces, and installation of nacelle strakes.. Micro AeroDynamics Inc
- [STC SA00680SE (4 OF 6](https://openairdocs.org/stc/SA00680SE%20(4%20OF%206): Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer.. Electronics International
- [STC SA00709LA](https://openairdocs.org/stc/SA00709LA): Installation of control wheel. Includes provisions only for a push-to-talk (PTT) switch. Separate FAA approval of PTT switch is required.. Trevor Burward-Hoy
- [STC SA00729SE](https://openairdocs.org/stc/SA00729SE): Installation of twin temperature indicating system with fuel flow in accordance with J.P. Instruments (JPI) Installation manual Report No. 760, Revision -, dated 7/20/99, or later FAA approved revision.. J P Instruments
- [STC SA00744DE](https://openairdocs.org/stc/SA00744DE): Installation of the Automatic Dependent Surveillance  Broadcast (ADS-B) Out Equipment using a Trig Avionics TT31 Transponder and an approved position sensor. Peregrine
- [STC SA00747AT](https://openairdocs.org/stc/SA00747AT): Installation of left hand and right hand inboard fuel cell assemblies.. FFC Manufacturing
- [STC SA00749AT](https://openairdocs.org/stc/SA00749AT): Modification of flush type fuel caps for installation of a locking cylinder and keeper. (1964 and subsequent). Aero Trim, Inc
- [STC SA00756DE](https://openairdocs.org/stc/SA00756DE): Installation of Automatic Dependent Surveillance  Broadcast (ADS-B) Out Equipment using a Trig Avionics TT22 Transponder and an approved Global Positioning System (GPS) Position Sensor. Peregrine
- [STC SA00761AT](https://openairdocs.org/stc/SA00761AT): Installation of left and right side fuel cell assemblies.. FFC Manufacturing
- [STC SA00765DE](https://openairdocs.org/stc/SA00765DE): Installation of Automatic Dependent Surveillance  Broadcast (ADS-B) Out functionality using the BendixKing KT74 Transponder and qualified position sensor. Peregrine
- [STC SA00780SE](https://openairdocs.org/stc/SA00780SE): Installation of the True Lock Safety Retention Axle Lock Nut System. True Lock LLC
- [STC SA00804SE](https://openairdocs.org/stc/SA00804SE): Installation of an engine failure indicator system, also referred to as a 'low Thrust Detector system.'. Advanced Aero Safety Inc.
- [STC SA00823CH](https://openairdocs.org/stc/SA00823CH): Installation of various de-icer wire harnesses.. SMR Technologies
- [STC SA00833WI](https://openairdocs.org/stc/SA00833WI): Installation of a seat headrest.. Aviation Fabricators Inc
- [STC SA00861SE](https://openairdocs.org/stc/SA00861SE): Installation of J.P. Instruments (JPI) fuel flow indicating system. J P Instruments
- [STC SA00944CH](https://openairdocs.org/stc/SA00944CH): Replace Janitrol combustion heater Model 81D94-X (XX) with C&D Associates combustion heater Model CD25K, CD35K, and CD45K. Hartzell Engine Technologies, LLC
- [STC SA00948CH](https://openairdocs.org/stc/SA00948CH): Installation of various de-icer wire harnesses. (E90 modified by STC SA3593NM, F90 modified by STC SA4131NM, B200 modified by STC SA2698NM-S, DHC-6 Series modified by STC SA3532NM). SMR Technologies Inc
- [STC SA01085LA](https://openairdocs.org/stc/SA01085LA): Installation of the VNS 1000 Voice Navigation System.. VNS Incorporated
- [STC SA01105WI-D (1 OF 2)](https://openairdocs.org/stc/SA01105WI-D%20(1%20OF%202)): Installation of Bendix/King KMD 550/850 Multi-Function Display System with Optional Traffic, Terrain and Weather Sensors.  This STC also is approved for some single-engine aircraft.  See SA01105WI-D (2 of 2).. Honeywell International Inc.
- [STC SA01114CH](https://openairdocs.org/stc/SA01114CH): Installation of P2 Incorporated 6600 Audio Advisory system. P2 Incorporated
- [STC SA01118WI](https://openairdocs.org/stc/SA01118WI): Installation of the Concorde FLA or VRSLA RG series batteries. Concorde Battery Corporation
- [STC SA01158WI](https://openairdocs.org/stc/SA01158WI): Installation of Aero Enhancements UV250-1 Supplemental Instrument Panel Lightning System.. Aero Enhancements Inc.
- [STC SA01205WI-D (1 OF 2)](https://openairdocs.org/stc/SA01205WI-D%20(1%20OF%202)): Installation of the KMD 250 Multi-Function Display System with Optional Internal VFR GPS and Optional Traffic and Weather Sensors.. Honeywell International Inc
- [STC SA01213CH](https://openairdocs.org/stc/SA01213CH): Install air ambulance conversion in accordance with Spectrum Aeromed Inc.  Drawings as listed on AML SA01213CH, or later FAA approved revision.. Spectrum Aeromed LLC dba Spectrum Aeromed
- [STC SA01229SE PAGE 1](https://openairdocs.org/stc/SA01229SE%20PAGE%201): Installation of GNS 480 (CNX80) GPS WAAS Navigator with integrated VHF Navigation and Communication radios. Garmin International Inc
- [STC SA01316LA](https://openairdocs.org/stc/SA01316LA): Installation of Sandel Avionics Terrain Awareness and Warning System.. Sandel Avionics LLC
- [STC SA01420WI](https://openairdocs.org/stc/SA01420WI): Installation of Garmin GNS 430A / 530A COMM/NAV/GPS Systems.  Data required:  (1)  Scandinavian Avionics Design GmbH Drawing List 2027438-DL-02, Issue 2; or later EASA approved revisions.  (2)   Scandinavian Avionics Design GmbH Approved Aircraft Flight Manual Supplement, Doc. 2027438-AM-02A, Issue 1, and Doc. 2027438-AM-02B, Issue 2, both approved by EASA under approval No. EASA.A.S.01389 dated 07-09-2005, or later EASA approved revision.. Scandinavian Avionics Design GmbH
- [STC SA01436SE (1 OF 2)](https://openairdocs.org/stc/SA01436SE%20(1%20OF%202)): Cockpit sunvisor retrofit kit.. Rosen Sunvisor Systems LLC
- [STC SA01452CH](https://openairdocs.org/stc/SA01452CH): Installation of an air ambulance conversion kit.. Med-Pac Inc.

All 263: https://openairdocs.org/model/cessna-421/stcs.md

## NTSB investigations (62, newest 50)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN23LA267](https://openairdocs.org/ntsb/CEN23LA267), Jun 24, 2023: Cessna 421 (N123SM), Rockport, TX, substantial damage. Probable cause: The failure of the left engine starter adapter gear, which resulted in catastrophic damage to other engine components, and the subsequent loss of engine power.
- [NTSB ERA19FA283](https://openairdocs.org/ntsb/ERA19FA283), Sep 29, 2019: Cessna 421 (N731PF), Deland, FL, destroyed, 3 fatal. Probable cause: The pilot’s failure to maintain control of the airplane, which resulted in a collision with terrain. Contributing was the pilot’s lack of training and experience in the accident airplane make and…
- [NTSB CEN14LA256](https://openairdocs.org/ntsb/CEN14LA256), Apr 22, 2014: Cessna 421 (N866BS), Horseshoe Bay, TX, substantial damage. Probable cause: The failure of the drive mechanism for the gearbox motor, which resulted in the gear not extending for the landing.
- [NTSB CHI07LA154](https://openairdocs.org/ntsb/CHI07LA154), May 23, 2007: Cessna 421 (N4082L), Chesterfield, MO, substantial damage. Probable cause: Maintenance personnel failed to comply with an Airworthiness Directive which resulted in the total failure of the starter adapter gear teeth and the crankshaft gear teeth and the pilot failed to…
- [NTSB SEA07LA055](https://openairdocs.org/ntsb/SEA07LA055), Jan 30, 2007: Cessna 421 (N4584L), Pocatello, ID, substantial damage. Probable cause: The separation of the bolt that attaches the elevator trim tab actuator rod to the elevator trim tab horn, resulting in violent flutter of the elevator, and eventually to the separation of the…
- [NTSB DEN05FA038](https://openairdocs.org/ntsb/DEN05FA038), Dec 17, 2004: Cessna 421 (N421FR), Englewood, CO, destroyed, 3 fatal. Probable cause: loss of engine power due to fuel starvation, and the instructor's failure to maintain aircraft control. Contributing factors were a partially blocked fuel line resulting in restricted fuel flow, the…
- [NTSB IAD03FA032](https://openairdocs.org/ntsb/IAD03FA032), Feb 17, 2003: Cessna 421 (N421TJ), Ferguson, KY, destroyed, 3 fatal. Probable cause: The pilot's failure to follow the instrument approach procedure, which resulted in an early descent into trees and terrain. Factors included the low ceiling and the night lighting conditions.
- [NTSB DEN03FA025](https://openairdocs.org/ntsb/DEN03FA025), Dec 25, 2002: Cessna 421 (N421D), Akron, CO, destroyed, 2 fatal. Probable cause: The fractured connecting rods and the pilot not maintaining aircraft control following the engine failure. Factors contributing to the accident were the low altitude, the pilot not maintaining…
- [NTSB ATL01FA036](https://openairdocs.org/ntsb/ATL01FA036), Feb 14, 2001: Cessna 421 (N5AY), Munford, AL, destroyed, 5 fatal. Probable cause: The pilot continued visual flight into instrument weather conditions that resulted in the inflight collision with a river bank. Factors were reduced visibility and dark night.
- [NTSB CHI98FA187](https://openairdocs.org/ntsb/CHI98FA187), Jun 1, 1998: Cessna 421 (N541N), Little Falls, MN, destroyed, 1 fatal. Probable cause: the pilot's continued operation with a known deficiency in equipment.
- [NTSB FTW97FA130](https://openairdocs.org/ntsb/FTW97FA130), Mar 20, 1997: Cessna 421 (N4050L), League City, TX, substantial damage, 1 fatal. Probable cause: The pilot's failure to refuel the airplane which resulted in the loss of power to the right engine due to fuel exhaustion, and the pilot's failure to maintain airspeed during the single engine…
- [NTSB CHI96FA146](https://openairdocs.org/ntsb/CHI96FA146), Apr 29, 1996: Cessna 421 (N341DA), Bernard, IA, destroyed, 3 fatal. Probable cause: the pilot's operation of the airplane with known deficiencies, subsequent loss of oil from the left engine, and the pilot's failure to maintain minimum controllable airspeed (VMC), while diverting to…
- [NTSB SEA95LA194](https://openairdocs.org/ntsb/SEA95LA194), Aug 18, 1995: Cessna 421 (N3121K), Creswell, OR, substantial damage. Probable cause: the company mechanic's failure to properly fabricate a fuel line.
- [NTSB MIA94LA019](https://openairdocs.org/ntsb/MIA94LA019), Nov 10, 1993: Cessna 421 (N1600B), Miami, FL, substantial damage. Probable cause: FAILURE OF THE PILOT-IN-COMMAND TO OBTAIN THE PROPER ASSISTANCE AFTER BEING NOTIFIED OF A FUEL LEAK FROM THE LEFT WING FUEL TANKS AFTER REFUELING.
- [NTSB DEN91LA066](https://openairdocs.org/ntsb/DEN91LA066), May 1, 1991: Cessna 421 (N18DF), Englewood, CO, substantial damage. Probable cause: POWER LOSS ON BOTH ENGINES AS A RESULT OF EXHAUST SYSTEM FAILURE.
- [NTSB LAX91LA142](https://openairdocs.org/ntsb/LAX91LA142), Mar 23, 1991: Cessna 421 (N4071L), El Monte, CA, substantial damage. Probable cause: THE PILOT RETRACTING THE LANDING GEAR DURING THE LANDING ROLL.
- [NTSB FTW89LA135](https://openairdocs.org/ntsb/FTW89LA135), Jul 13, 1989: Cessna 421 (N699PC), Okmulgee, OK, substantial damage. Probable cause: FAILURE OF THE NOSE GEAR EXTENSION ASSEMBLY AND THE PILOT'S IMPROPER PRECAUTIONARY LANDING PROCEDURES THAT INCLUDED SECURING THE ENGINES PRIOR TO A POINT WHERE A SAFE LANDING WAS ASSURED.
- [NTSB LAX89LA217](https://openairdocs.org/ntsb/LAX89LA217), Jun 17, 1989: Cessna 421 (N421S), Picacho, AZ, destroyed. Probable cause: FAILURE OF THE NUMBER THREE EXHAUST VALVE ON THE LEFT ENGINE. A MAJOR FACTOR WAS THE HIGH DENSITY ALTITUDE WHERE THE AIRPLANE WOULD NOT OPERATE ON SINGLE ENGINE.
- [NTSB FTW89FA074](https://openairdocs.org/ntsb/FTW89FA074), Mar 29, 1989: Cessna 421 (N4595L), Brownsville, TX, destroyed, 1 fatal. Probable cause: THE PILOT'S IMPROPER EMERGENCY PROCEDURE AFTER LOSSING POWER IN THE RIGHT ENGINE, AND HIS FAILURE TO MAINTAIN MINIMUM CONTROL SPEED (VMC), WHICH RESULTED IN A LOSS OF AIRCRAFT CONTROL. FACTORS…
- [NTSB NYC88FA181](https://openairdocs.org/ntsb/NYC88FA181), Jul 14, 1988: Cessna 421 (N825DW), Taunton, MA, destroyed, 1 fatal
- [NTSB MIA87FA239](https://openairdocs.org/ntsb/MIA87FA239), Sep 2, 1987: Cessna 421 (N421DT), Coral Springs, FL, destroyed, 1 fatal
- [NTSB FTW86FA133](https://openairdocs.org/ntsb/FTW86FA133), Jul 19, 1986: Cessna 421 (N6VR), Addison, TX, destroyed, 4 fatal
- [NTSB FTW85LA218](https://openairdocs.org/ntsb/FTW85LA218), May 10, 1985: Cessna 421 (N888K), Mckinney, TX, substantial damage
- [NTSB CHI84FA303](https://openairdocs.org/ntsb/CHI84FA303), Jul 20, 1984: Cessna 421 (N14TC), Birchwood, WI, destroyed, 3 fatal
- [NTSB LAX83LA168](https://openairdocs.org/ntsb/LAX83LA168), Mar 29, 1983: Piper PA-28-161 (N81191), Glendale, AZ, substantial damage
- [NTSB ATL83LA120](https://openairdocs.org/ntsb/ATL83LA120), Feb 24, 1983: Cessna 421 (N123SM), Dayton, TN, substantial damage
- [NTSB CHI82FA209](https://openairdocs.org/ntsb/CHI82FA209), Jun 15, 1982: Cessna 421 (N421CB), Racine, WI, substantial damage
- [NTSB CHI82FA091](https://openairdocs.org/ntsb/CHI82FA091), Mar 18, 1982: Cessna 421 (N33KC), Richmond, IN, destroyed, 1 fatal
- [NTSB CHI81FEV31](https://openairdocs.org/ntsb/CHI81FEV31), Aug 16, 1981: Cessna 421 (N14TC), Springfield, IL, substantial damage
- [NTSB LAX81FUA13](https://openairdocs.org/ntsb/LAX81FUA13), Aug 9, 1981: Cessna 421 (N19RJ), Long Beach, CA, destroyed
- [NTSB ATL81FKG20](https://openairdocs.org/ntsb/ATL81FKG20), May 29, 1981: Cessna 421 (N76ES), Statesboro, GA, substantial damage
- [NTSB MKC81FA035](https://openairdocs.org/ntsb/MKC81FA035), May 18, 1981: Cessna 421 (N1600B), Spencer, IA, substantial damage
- [NTSB MIA81FA042](https://openairdocs.org/ntsb/MIA81FA042), Feb 3, 1981: Cessna 421 (N4484), Ft Lauderdale, FL, destroyed, 6 fatal
- [NTSB MIA80DLE06](https://openairdocs.org/ntsb/MIA80DLE06), Sep 22, 1980: Cessna 421 (N66PC), Orlando, FL, substantial damage
- [NTSB LAX80FUG58](https://openairdocs.org/ntsb/LAX80FUG58), Sep 19, 1980: Cessna 421 (N4091L), Palm Springs, CA, destroyed
- [NTSB LAX80FUQ22](https://openairdocs.org/ntsb/LAX80FUQ22), Aug 17, 1980: Cessna 421A (N3138K), Lancaster, CA, substantial damage
- [NTSB SEA80FYK13](https://openairdocs.org/ntsb/SEA80FYK13), Aug 11, 1980: Cessna 421 (N3150K), Redmond, OR, substantial damage
- [NTSB IAD79FID24](https://openairdocs.org/ntsb/IAD79FID24), Aug 5, 1979: Cessna 421 (N3126K), Norfolk, VA, destroyed
- [NTSB IAD79FA046](https://openairdocs.org/ntsb/IAD79FA046), May 4, 1979: Cessna 421 (N123SM), Sevierville, TN, substantial damage
- [NTSB FTW79FRG25](https://openairdocs.org/ntsb/FTW79FRG25), Apr 9, 1979: Cessna 421 (N4584L), Lakeway, TX, substantial damage
- [NTSB UNK79X0106](https://openairdocs.org/ntsb/UNK79X0106), Dec 7, 1978: Cessna 421 (N4589L), Bezier, France, substantial damage
- [NTSB MKC77FCD26](https://openairdocs.org/ntsb/MKC77FCD26), Jul 1, 1977: Cessna 421 (N4048L), Cedar Rapids, IA, substantial damage
- [NTSB FTW76FPD27](https://openairdocs.org/ntsb/FTW76FPD27), Jan 28, 1976: Cessna 421 (N3160K), Iowa Park, TX, substantial damage
- [NTSB NYC76AN036](https://openairdocs.org/ntsb/NYC76AN036), Sep 27, 1975: Dassault Falcon (N25FE), Warwick, RI, substantial damage
- [NTSB NYC75AN037](https://openairdocs.org/ntsb/NYC75AN037), Sep 13, 1974: Cessna 421 (N3160K), Westfield, MA, substantial damage
- [NTSB MKC74FCG43](https://openairdocs.org/ntsb/MKC74FCG43), Jun 14, 1974: Cessna 421 (N4572L), Springfield, MO, substantial damage
- [NTSB MKC74AK056](https://openairdocs.org/ntsb/MKC74AK056), Mar 29, 1974: Cessna 421 (N3139K), Bunker, MO, destroyed, 5 fatal
- [NTSB NYC74FHJ20](https://openairdocs.org/ntsb/NYC74FHJ20), Jan 27, 1974: Cessna 421 (N3126K), Farmingdale, NY, substantial damage
- [NTSB FTW74FPM18](https://openairdocs.org/ntsb/FTW74FPM18), Jan 11, 1974: Cessna 411 (N4005L), Tulsa, OK, destroyed
- [NTSB CHI74AC042](https://openairdocs.org/ntsb/CHI74AC042), Nov 14, 1973: Cessna 421 (N550T), Plymouth, IN, destroyed, 5 fatal

All 62: https://openairdocs.org/model/cessna-421/ntsb.md

## FAA accident and incident reports (100, newest 50)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20230624010359A](https://openairdocs.org/incident/20230624010359A), Jun 24, 2023: Cessna 421 (N123SM), Rockport, TX, Substantial damage. [privacy data omitted] Serial number 421-0193 a Cessna 421 departed corpus christi (kcrp) with a destination to houston (k''') on a part 91 [privacy data…
- [Accident 20190929018389A](https://openairdocs.org/incident/20190929018389A), Sep 29, 2019: Cessna 421 (N731PF), Deland, FL, Destroyed, 3 fatal. Aircraft departed Deland airport on a local flight with one pilot and two passengers. About 25 minutes after takeoff aircraft crashed into the woods. During…
- [Incident 20170825017379I](https://openairdocs.org/incident/20170825017379I), Aug 25, 2017: Cessna 421 (N269F), Manchester, NH, Minor damage. This office notifed 8/25/2017 that N269F, C421, declared an emegency due to one engine out. Aircraft landed kmht, runway 6 without incident, exited and was…
- [Accident 20140422012409A](https://openairdocs.org/incident/20140422012409A), Apr 22, 2014: Cessna 421 (N866BS), Marble Falls, TX, Substantial damage. Pilot heard a loud pop upon selecting gear down. He was unable to obtain a green gear down indication following several attempts including emergency extension.…
- [Accident 20070523009519A](https://openairdocs.org/incident/20070523009519A), May 23, 2007: Cessna 421 (N4082L), St Louis, MO, Substantial damage. (-23) The pilot was departing from sus after dropping off a passenger at midwest aviation. Less than 90 seconds after take off from runway 26L, the pilot…
- [Accident 20070130000909A](https://openairdocs.org/incident/20070130000909A), Jan 30, 2007: Cessna 421 (N4584L), Pocatello, ID, Substantial damage. (-23) Ida to U01, climbing through 9400' MSL to 10500' MSL, pilot heard a bang, experienced flight control flutter and controllability issues. Pilot declared…
- [Accident 20041217033829A](https://openairdocs.org/incident/20041217033829A), Dec 17, 2004: Cessna 421 (N421FR), Denver, CO, Destroyed, 3 fatal. (-23) N421FR declared an emergency on departure runway 17L, kapa, due to an unspecified engine problem. The aircraft crashed and burned 1/4 mile southwest of…
- [Accident 20030216001879A](https://openairdocs.org/incident/20030216001879A), Feb 16, 2003: Cessna 421 (N421TJ), Ferguson, KY, Substantial damage, 3 fatal. (-23) On 2-16-03, at approximately 2000 local time, N421TJ crashed into a wooded ridge while conducting a GPS rwy 22 instrument approach to somerset, KY…
- [Accident 20021225034989A](https://openairdocs.org/incident/20021225034989A), Dec 25, 2002: Cessna 421 (N421D), Akron, CO, Destroyed, 2 fatal. (-23) The flight departed on an instrument flight rules (IFR) flight plan from centennial airport (apa) englewood, CO at 0933MST on December 25, 2002. At…
- [Incident 20010409006099I](https://openairdocs.org/incident/20010409006099I), Apr 9, 2001: Cessna 421 (N20GS), Palm Springs, CA. (-23) On April 9, 2001, at 11:54 PST, a Cessna 421 departed long beach, CA. Enroute to roswell, NM. The a/c diverted to Palm Springs airport, Palm Springs, CA.…
- [Accident 20010213001869A](https://openairdocs.org/incident/20010213001869A), Feb 13, 2001: Cessna 421 (N5AY), Anniston, AL, Destroyed, 5 fatal. (-23) On February 13, 2001AT 1840 CST, Cessna N5AY, collided with the southeast bank of the choccolocco creek near munford, Alabama, while manuevering for a…
- [Accident 19980601026769A](https://openairdocs.org/incident/19980601026769A), Jun 1, 1998: Cessna 421 (N541N), Little Falls, MN, Destroyed, 1 fatal. Witnesses reported that the aircraft was not gaining altitude shortly after take-off. The wings were dipping up then down. The pilot was then seen trying to…
- [Incident 19971110046639I](https://openairdocs.org/incident/19971110046639I), Nov 10, 1997: Cessna 421 (N333AK), Morristown, TN, Minor damage. (-23) M & d report to be filed on gear.
- [Incident 19970406004899I](https://openairdocs.org/incident/19970406004899I), Apr 6, 1997: Cessna 421 (N285N), Bend, OR, Minor damage. Narrative: on 4-6-97, 1836 PDT, at Sunriver, Oregon airport, aircraft N285N, Cessna 421 touched down and the left main gear collapsed. The aircraft went off…
- [Accident 19970320003319A](https://openairdocs.org/incident/19970320003319A), Mar 20, 1997: Cessna 421 (N4050L), Houston, TX, Substantial damage, 1 fatal. Lost right engine power on descent. Pilot reported out of fuel, crashed into water. (-23) on March 19, 1997, at 2333 central standard time, a Cessna 421,…
- [Accident 19960429046099A](https://openairdocs.org/incident/19960429046099A), Apr 29, 1996: Cessna 421 (N341DA), Bernard, IA, Destroyed, 3 fatal. (.4)During flight, the pilot reported shutting down the left engine due to a loss of oil pressure. He declared an emergency and diverted toward an alternate…
- [Accident 19950818038759A](https://openairdocs.org/incident/19950818038759A), Aug 18, 1995: Cessna 421 (N3121K), Creswell, OR, Substantial damage. Fire in left engine on landing. Evacuated. Put out fire. Fuel line repaired by bogas line to save money.
- [Accident 19931110042579A](https://openairdocs.org/incident/19931110042579A), Nov 10, 1993: Cessna 421 (N1600B), Miami, FL, Substantial damage. Warned fuel leak left wing. Ignored. Backfire on engine start. Left wing exploded. Ground crew overfilled tank.
- [Incident 19930401011889I](https://openairdocs.org/incident/19930401011889I), Apr 1, 1993: Cessna 421B (N100JL), Lufkin, TX. Aircraft started a pitch oscillation on descent. Landed safely. Found left elevator middle hinge bolt missing.
- [Incident 19910806047699I](https://openairdocs.org/incident/19910806047699I), Aug 6, 1991: Cessna 421 (N4044L), Mena, AR, Minor damage. Landing gear collapsed on landing rollout. Found down limit switch part failed.
- [Accident 19910501013889A](https://openairdocs.org/incident/19910501013889A), May 1, 1991: Cessna 421 (N18DF), Denver, CO, Substantial damage. Lost both engines on initial climbout. Collapsed gear landing in a field. Both exhaust pipes failed at welds.
- [Accident 19910322007209A](https://openairdocs.org/incident/19910322007209A), Mar 22, 1991: Cessna 421A (N4071L), El Monte, CA, Substantial damage. Left main gear collapsed on landing roll. No mechanical defects. Damage shows gear intransit on touchdown.
- [Incident 19910306019289I](https://openairdocs.org/incident/19910306019289I), Mar 6, 1991: Cessna 421 (N421FR), Green Bay, WI, Minor damage. Aircraft encountered icing and unable to maintain altitude. Requested vectors to airport. Made a hard landing.
- [Incident 19910218007019I](https://openairdocs.org/incident/19910218007019I), Feb 18, 1991: Cessna 421 (N421FR), Perico, TX. Fuel low. Precautionary landing on highway. Added fuel and departed. Higher winds aloft than forcasted.
- [Incident 19910110011949I](https://openairdocs.org/incident/19910110011949I), Jan 10, 1991: Cessna 421 (N20GS), San Jose, CA. Aircraft departed end of runway on landing rollout. Brake system had no fluid. Person named as pilot unavailable.
- [Incident 19901222062859I](https://openairdocs.org/incident/19901222062859I), Dec 22, 1990: Cessna 421 (N140DP), Little Rock, AR, Minor damage. Landed short of runway. Damaged threshold lights and left gear collapsed.
- [Accident 19890713022279A](https://openairdocs.org/incident/19890713022279A), Jul 13, 1989: Cessna 421 (N699PC), Okmulgee, OK, Substantial damage. Unable to lock down nose gear. Secured both engines too soon on gear up landing. Landed short. Retract rod failed.
- [Incident 19890623017369I](https://openairdocs.org/incident/19890623017369I), Jun 23, 1989: Cessna 421 (N285N), Friday Harbor, WA, Minor damage. Gear collapsed on landing rollout when the aircraft weight was fully on the wheels.
- [Accident 19890617016179A](https://openairdocs.org/incident/19890617016179A), Jun 17, 1989: Cessna 421 (N421S), Pichaco, AZ, Destroyed. Lost left engine on initial climbout, 114 temp and density altitude precluded further climb. Exhaust valve failure.
- [Incident 19890521030609I](https://openairdocs.org/incident/19890521030609I), May 21, 1989: Cessna 421 (N888K), Paris, TX. Manifold pressure dropped on left engine. Precautionary landing. Turbocharger induction duct had blown off.
- [Incident 19890429020459I](https://openairdocs.org/incident/19890429020459I), Apr 29, 1989: Cessna 421 (N4268T), Ramona, CA, Minor damage. Main gear collapsed on rollout. Came to rest off runway. Bolt attaching bellcrank had sheared off.
- [Accident 19890329004829A](https://openairdocs.org/incident/19890329004829A), Mar 29, 1989: Cessna 421 (N4595L), Brownsville, TX, Destroyed, 1 fatal. Starved right engine of fuel on self check out. Failed feather, put gear and flaps down. Below VMC stalled. Crashed
- [Incident 19890306017809I](https://openairdocs.org/incident/19890306017809I), Mar 6, 1989: Cessna 421 (N4004L), Mc Allen, TX, Minor damage. Right main gear collapsed on rollout. Slid off runway. Bolt in the landing gear retraction system had sheared.
- [Incident 19890305026969I](https://openairdocs.org/incident/19890305026969I), Mar 5, 1989: Cessna 421 (N699PC), Tulsa, OK, Minor damage. Nose landing gear collapsed on rollout. Nose landing gear intermediate retraction tube bent.
- [Incident 19890210019649I](https://openairdocs.org/incident/19890210019649I), Feb 10, 1989: Cessna 421 (N52JR), Crookston, MN, Minor damage. Right engine lost power, then left engine. Landed off airport. Aux pump in right tank inop. Left aux tank pump inop.
- [Incident 19890127005959I](https://openairdocs.org/incident/19890127005959I), Jan 27, 1989: Cessna 421 (N421SH), Atlanta, GA, Minor damage. Left main gear collapsed while taxiing for takeoff. Cause undetermined.
- [Incident 19880725062409I](https://openairdocs.org/incident/19880725062409I), Jul 25, 1988: Cessna 421 (N11VF), Manti, UT, Substantial damage. Loss of power on base leg. Landed short of runway. Drifted off runway and hit VASI light. Skidded to stop on nose.
- [Incident 19880723043619I](https://openairdocs.org/incident/19880723043619I), Jul 23, 1988: Gulstm 690B (N62DW), Marquette, MI, Minor damage. Pilot watching another aircraft forgot to lower landing gear and landed gear up.
- [Accident 19880714026649A](https://openairdocs.org/incident/19880714026649A), Jul 14, 1988: Cessna 421 (N825DW), Taunton, MA, Destroyed, 1 fatal. Right engine smoked,lost oil pressure. Starter bolts had sheared.
- [Incident 19880520038759I](https://openairdocs.org/incident/19880520038759I), May 20, 1988: Cessna 421 (N1027D), Fallon, NV, Minor damage. Left gear collapsed taxiing to the ramp. Found the downlock link had failed in the threaded area of the rod end.
- [Incident 19870904070439I](https://openairdocs.org/incident/19870904070439I), Sep 4, 1987: Cessna 421 (N410RH), Paducah, KY, Minor damage. The pilot was unable to retract gear after takeoff. It collapsed on landing. Bellcrank broken. Unknown cause.
- [Accident 19870902050049A](https://openairdocs.org/incident/19870902050049A), Sep 2, 1987: Cessna 421 (N421DT), Coral Springs, FL, Destroyed, 1 fatal. Crashed into the everglades.IFR conditions in crash area. VFR pilot had no prior experience or checkout in aircraft
- [Incident 19870323028939I](https://openairdocs.org/incident/19870323028939I), Mar 23, 1987: Cessna 421 (N421DN), Lancaster, PA. Battery voltage low, no radio communications heard en route. Landed with ATC light signals. Circuit breaker popped.
- [Accident 19860719047019A](https://openairdocs.org/incident/19860719047019A), Jul 19, 1986: Cessna 421 (N6VR), Addison, TX, Destroyed, 3 fatal. Aircraft rolled inverted after liftoff. Impacted ground vertically. Pilots lack of experience in aircraft a factor.
- [Incident 19851113067149I](https://openairdocs.org/incident/19851113067149I), Nov 13, 1985: Cessna 421 (N66PC), Iraan, TX, Minor damage. Aircraft dropped suddenly and impacted runway during landing. Right main gear collapsed.
- [Incident 19850708034899I](https://openairdocs.org/incident/19850708034899I), Jul 8, 1985: Cessna 421 (N100LP), Houston, TX. Engines lost power on descent. After landing, water and black sediment was drained from fuel cells.
- [Accident 19850510016649A](https://openairdocs.org/incident/19850510016649A), May 10, 1985: Cessna 421 (N888K), Mckinney, TX, Substantial damage. Nose gear collapsed while taxiing back on the runway after landing. Claimed soft asphalt on runway caused collapse.
- [Incident 19850415029349I](https://openairdocs.org/incident/19850415029349I), Apr 15, 1985: Cessna 421 (N4010L), Ormond Beach, FL, Substantial damage. Right main gear collapsed on rollout. Found actuator rod bearing jammed preventing gear from locking over center.
- [Accident 19840720033699A](https://openairdocs.org/incident/19840720033699A), Jul 20, 1984: Cessna 421 (N14TC), Birchwood, WI, Destroyed, 2 fatal. Switched to aux tanks too soon, vented fuel overboard. Fuel exhaustion, both engines quit. Steep angle impact.
- [Incident 19831118073979I](https://openairdocs.org/incident/19831118073979I), Nov 18, 1983: Cessna 421 (N2740Y), Roanoke Rapids, NC, Minor damage. Unsafe left gear light until gear recycled. Got 3 greens and landed. Left main collapsed on rollout.

All 100: https://openairdocs.org/model/cessna-421/incidents.md

## Service difficulty reports (57, newest 50)

As reported by operators and repair stations, by the model named in the report.

- [SDR 2023FA0000152](https://openairdocs.org/sdr/2023FA0000152), Mar 22, 2023: UNKNOWN. UNKNOWN. I HAVE 3 CESSNA 421C SERIAL NUMBER RANGES FROM 421C0005-421C 1075 THE RIGHT BRAKE HARD LINE IN CABIN IS UNDER THE SCAT TUBING IN THE AIRCRAFT CAUSING DISSIMILAR
- [SDR CA090209001](https://openairdocs.org/sdr/CA090209001), Jan 23, 2009: ATTACH BOLT. CRACKED. THIS BOLT WAS INSPECTED DURING THE ANNUAL INSPECTION OF THIS AIRCRAFT. IT WAS VISUALLY SEEN TO HAVE WHAT LOOKED LIKE A CRACK ON THE HEAD SURFACE OF THE BOLT. TH
- [SDR 2006FA0001178](https://openairdocs.org/sdr/2006FA0001178), Dec 12, 2006: CLAMP. CRACKED. DURING PROGRESSIVE INSPECTION FOUND LT ENGINE TURBOCHARGER TO TAILPIPE CLAMP CRACKED ALONG CIRCUMFERENCE, APPROX. 4 INCH CRACK. FOUND SAME PN CLAMP ON THE RT EN
- [SDR CA061030003](https://openairdocs.org/sdr/CA061030003), Jun 27, 2006: GEAR. BROKEN. (CAN) (1)GEAR TOOTH BROKE OFF THE STARTER SHAFT GEAR IN A NEW STARTER ADAPTER ASSEMBLY CAUSING FOREIGN MATERIAL TO ENTER THE ENGINE LEADING TO FURTHER DAMAGE IN
- [SDR 2004FA0000915](https://openairdocs.org/sdr/2004FA0000915), Oct 22, 2004: EXHAUST ROCKER. BROKEN. ANNUAL PRE-INSPECTION RUN-UP RAN GOOD. POST INSPECTION RUN-UP RAN ROUGH. SUSPECTED A STICKING VALVE. FURTHER INVESTIGATION REVEALED A BROKEN EXHAUST ROCKER ARM 
- [SDR 2004FA0000914](https://openairdocs.org/sdr/2004FA0000914), Oct 22, 2004: ROCKER. BROKEN. ANNUAL PRE-INSPECTION RUN-UP RAN GOOD. POST INSPECTION RUN-UP RAN ROUGH. SUSPECTED A STICKING VALVE. FURTHER INVESTIGATION REVEALED A BROKEN EXHAUST ROCKER ARM 
- [SDR AUS20020774](https://openairdocs.org/sdr/AUS20020774), Jul 24, 2002: HOSE. TRANSPOSED. (AUS) LH ENGINE OIL FILTER SUPPLY AND DISCHARGE HOSES TRANSPOSED. OIL FILTER RUPTURED. PERSONNEL/MAINTENANCE ERROR.
- [SDR 2000ZZZX626](https://openairdocs.org/sdr/2000ZZZX626), Mar 14, 2000: BEAM. CRACKED. THE LEFT ENGINE AFT BEAM ASSEMBLY IS CRACKED. CRACK IS AT THE OUTBOARD BEAM ASSEMBLY (P/N 5054030-13) ATTACHMENT POINT AT THE TOP SIDE, AFT END, EXTENDING 1.125
- [SDR 2000ZZZX625](https://openairdocs.org/sdr/2000ZZZX625), Mar 14, 2000: MANIFOLD. CRACKED. DURING ANNUAL INSPECTION, A CRACK EXTENDING ABOUT 2 INCHES EACH SIDE OF THE THREADED BOSS. THE BOSS HAD BEEN DRILLED AND TAPPED FOR A HELICOIL. THREADED BOSS IS
- [SDR 20000331SH025](https://openairdocs.org/sdr/20000331SH025), Mar 6, 2000: STUD. FAILED. DURING INSPECTION OF OIL LEAK, FOUND NR 5 CYLINDER BASE FRONT LOWER MOUNT STUD BROKEN. POSSIBLY, THE STUD WAS HARD AND BROKE UNDER STRESS. (X)
- [SDR 2000ZZZX378](https://openairdocs.org/sdr/2000ZZZX378), Dec 30, 1999: RUDDER OPENING. CONTAMINATED. A LARGE AND VERY WELL HIDDEN BIRD'S NEST WAS FOUND IN RUDDER OPENING. FORWARD MIDWAY WHERE RUDDER TRIM COMES IN. EVERYTHING HAD SCREENS, BUT THE BIRDS FOUND A P
- [SDR 99ZZZX302](https://openairdocs.org/sdr/99ZZZX302), Dec 11, 1998: LINE. LEAKING. PILOT REPORTED A SEVERE OIL LEAK ON THE LT ENGINE. REMOVAL OF ENG COWLINGS REVEALED OIL LEAKING FROM INSIDE OF THE FIRE SLEEVE ON THE FORWARD END OF THE TURBOCH
- [SDR 98ZZZX3931](https://openairdocs.org/sdr/98ZZZX3931), Oct 6, 1998: HINGE. LOOSE. RIGHT AND LEFT OUTBOARD AILERON HINGE AS ATTACHED TO SPAR. RIVETS THAT PASS THROUGH HINGE, SPAR, AND LAST RIB HAVE SHEARED LEAVING LAST RIB UNSUPPORTED CRACKING
- [SDR 98ZZZX3930](https://openairdocs.org/sdr/98ZZZX3930), Oct 6, 1998: HINGE. LOOSE. RIGHT AND LEFT OUTBOARD AILERON HINGE AS ATTACHED TO SPAR. RIVETS THAT PASS THROUGH HINGE, SPAR, AND LAST RIB HAVE SHEARED LEAVING LAST RIB UNSUPPORTED CRACKING
- [SDR 97ZZZX3153](https://openairdocs.org/sdr/97ZZZX3153), Jun 13, 1997: ALTERNATOR. FAILED. ALTERNATOR FAILED AFTER 136.6 HOURS OF OPERATION. OVERHAULED 10-3-96. SUBMITTER STATED CONTINUE TO HAVE SHORT SERVICE LIFE ON THESE UNITS.
- [SDR 97ZZZX1827](https://openairdocs.org/sdr/97ZZZX1827), Feb 6, 1997: GEAR. DETACHED. PILOT LOST POWER FROM THE ALTERNATOR. UPON INVESTIGATING THE PROBLEM, DISCOVERED THE ALTERNATOR DRIVE GEAR HAD FALLEN OFF THE ALTERNATOR, INSIDE THE ENGINE, CAU
- [SDR 97ZZZX1826](https://openairdocs.org/sdr/97ZZZX1826), Feb 6, 1997: CRANK GEAR. SCREWS LOOSE. UPON ENGINE DISASSEMBLY FOUND ALL 6 CRANK GEAR RETAINING SCREWS 'GANG WIRED'. IN ADDITION TO NOT BEING LOCK WIRED CORRECTLY, THE CRANK GEAR SCREWS WERE ALL LOOS
- [SDR 97ZZZX1193](https://openairdocs.org/sdr/97ZZZX1193), Jan 1, 1997: WASTEGATE. CRACKED. DURING AN OIL AND FILTER CHANGE, THE WASTEGATE CRACK DEFECT WAS FOUND. DEFECT NOT PRESENT AT 50 HOUR CHECK 50 HOURS PREVIOUS.
- [SDR EY2R9601308](https://openairdocs.org/sdr/EY2R9601308), Dec 1, 1996: NUT. CORRODED. NUT CORRODED.
- [SDR EY2R9601307](https://openairdocs.org/sdr/EY2R9601307), Dec 1, 1996: HUB. CORRODED. HUB FOUND CORRODED.
- [SDR EY2R9601281](https://openairdocs.org/sdr/EY2R9601281), Dec 1, 1996: BLADE. CORRODED. BLADE SHANK, SN K76153, FOUND CORRODED.
- [SDR EY2R9601280](https://openairdocs.org/sdr/EY2R9601280), Dec 1, 1996: BLADE. CORRODED. BLADE SHANK, SN K76140, FOUND CORRODED.
- [SDR EY2R9601279](https://openairdocs.org/sdr/EY2R9601279), Dec 1, 1996: BLADE. CORRODED. BLADE SHANK, SN K76136, FOUND CORRODED.
- [SDR EY2R9601261](https://openairdocs.org/sdr/EY2R9601261), Dec 1, 1996: BLADE. CORRODED. BLADE, SN C31669YS, FOUND CORRODED.
- [SDR EY2R9601028](https://openairdocs.org/sdr/EY2R9601028), Oct 1, 1996: SLIP RING. CORRODED. CORROSION FOUND ON SPLIT RING.
- [SDR EY2R9601027](https://openairdocs.org/sdr/EY2R9601027), Oct 1, 1996: RETAIN BEARING. CORRODED. RETAIN BEARING CORRODED.
- [SDR EY2R9601026](https://openairdocs.org/sdr/EY2R9601026), Oct 1, 1996: SPLIT RETAINER. CORRODED. CORROSION FOUND ON SPLIT RETAINER.
- [SDR EY2R9600914](https://openairdocs.org/sdr/EY2R9600914), Aug 1, 1996: PROP. CORRODED. PROP ASSY CORRODED
- [SDR EY2R9601545](https://openairdocs.org/sdr/EY2R9601545), Jun 1, 1996: FEATHER CYLINDER. DEFECTIVE. PROP ASSY FEATHER ASSY .067 LARGER THAN NORMAL
- [SDR EY2R9600770](https://openairdocs.org/sdr/EY2R9600770), Jun 1, 1996: DOWEL. CORRODED. DOWEL CORRODED.
- [SDR EY2R9600757](https://openairdocs.org/sdr/EY2R9600757), Jun 1, 1996: BLADE. CORRODED. BLADE FOUND CORRODED.
- [SDR EY2R9600756](https://openairdocs.org/sdr/EY2R9600756), Jun 1, 1996: BLADE. CORRODED. BLADE, SN OA037YS, FOUND CORRODED.
- [SDR EY2R9600755](https://openairdocs.org/sdr/EY2R9600755), Jun 1, 1996: BLADE. CORRODED. BLADE, SN HL062YS, FOUND CORRODED.
- [SDR EY2R9600754](https://openairdocs.org/sdr/EY2R9600754), Jun 1, 1996: BLADE. CORRODED. BLADE, SN HL080YS, FOUND CORRODED.
- [SDR EY2R9600753](https://openairdocs.org/sdr/EY2R9600753), Jun 1, 1996: HUB. CORRODED. HUB FOUND CORRODED.
- [SDR EY2R9600752](https://openairdocs.org/sdr/EY2R9600752), Jun 1, 1996: NUT. CORRODED. NUT CORRODED.
- [SDR EY2R9600751](https://openairdocs.org/sdr/EY2R9600751), Jun 1, 1996: FERRULE. CORRODED. FERRULE FOUND CORRODED.
- [SDR EY2R9600750](https://openairdocs.org/sdr/EY2R9600750), Jun 1, 1996: BLADE ACT PIN. CORRODED. BLADE ACT PIN FOUND CORRODED.
- [SDR EY2R9600749](https://openairdocs.org/sdr/EY2R9600749), Jun 1, 1996: BLADE. CORRODED. BLADE, SN IA029, FOUND CORRODED.
- [SDR EY2R9600071](https://openairdocs.org/sdr/EY2R9600071), Jun 1, 1996: HUB. CRACKED. HUB ASSY CRACKED
- [SDR EY2R9601502](https://openairdocs.org/sdr/EY2R9601502), May 1, 1996: PISTON ROD ASSY. WORN. PROP ASSY PISTON ROD ASSY IS WORN
- [SDR EY2R9600618](https://openairdocs.org/sdr/EY2R9600618), May 1, 1996: PROPELLER. CORRODED. EXCESSIVE INTERNAL DAMAGE & CORR
- [SDR EY2R9600617](https://openairdocs.org/sdr/EY2R9600617), May 1, 1996: ACT PIN ASSY. CORRODED. ACT PIN ASSY FOUND CORRODED.
- [SDR EY2R9600616](https://openairdocs.org/sdr/EY2R9600616), May 1, 1996: ACT PIN ASSY. CORRODED. ACT PIN ASSY FOUND CORRODED.
- [SDR EY2R9600612](https://openairdocs.org/sdr/EY2R9600612), May 1, 1996: RETAIN BEARING. CORRODED. RETAIN BEARING FOUND WITH CORROSION.
- [SDR EY2R9600061](https://openairdocs.org/sdr/EY2R9600061), May 1, 1996: HUB. CRACKED. HUB CRACKED IN RETENTION THREADS
- [SDR EY2R9600060](https://openairdocs.org/sdr/EY2R9600060), May 1, 1996: HUB. CRACKED. HUB CRACKED IN RETENTION THREADS
- [SDR EY2R9601480](https://openairdocs.org/sdr/EY2R9601480), Apr 1, 1996: HUB. STRIPPED. PROP ASSY HUB DOWEL PIN HOLE STUD STRIPPED
- [SDR EY2R9600524](https://openairdocs.org/sdr/EY2R9600524), Apr 1, 1996: CYLINDER PIN. CORRODED. CORROSION FOUND ON CYLINDER PIN.
- [SDR EY2R9600523](https://openairdocs.org/sdr/EY2R9600523), Apr 1, 1996: BLADE. CORRODED. BLADE, SN B24646YS, FOUND CORRODED.

All 57: https://openairdocs.org/model/cessna-421/reports.md

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.