# Service difficulty reports: Cessna 421 A list on [Cessna 421](https://openairdocs.org/model/cessna-421.md). Newest first. General aviation reporting is voluntary. Page 1 of 2 · 57 reports - [SDR 2023FA0000152](https://openairdocs.org/sdr/2023FA0000152.md): Unknown · unknown · Mar 22, 2023 · Cessna 421 · Standard Practices/Structures > 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 METAL CORROSION, I HAVE 3 THAT RAN OFF RUNWAY DUE TO RIGHT BRAKE FAILURE. PLEASE CHECK HARD LINE FO - [SDR CA090209001](https://openairdocs.org/sdr/CA090209001.md): Attach Bolt · cracked · Jan 23, 2009 · Cessna 421 · Wing Main, Frame Structure > 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. THIS COULD BE MISTAKEN AS DAMAGE FROM A DRIFT OR HAMMER DONE DURING INSTALLATION. THE PART WAS REMO - [SDR 2006FA0001178](https://openairdocs.org/sdr/2006FA0001178.md): Clamp · cracked · Dec 12, 2006 · Cessna 421 · Exhaust Turbocharger > DURING PROGRESSIVE INSPECTION FOUND LT ENGINE TURBOCHARGER TO TAILPIPE CLAMP CRACKED ALONG CIRCUMFERENCE, APPROX. 4 INCH CRACK. FOUND SAME PN CLAMP ON THE RT ENGINE OF THIS AIRCRAFT TO BE CRACKED 7 HOURS PREVIOUSLY. - [SDR CA061030003](https://openairdocs.org/sdr/CA061030003.md): Gear · broken · Jun 27, 2006 · Cessna 421 · Engine Starter > (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 INSIDE THE CRANKCASE. FINAL RESULT WAS LOSS OF POWER TO THE RT ENGINE AND UNSCHEDULED LANDING. (TC NR - [SDR 2004FA0000915](https://openairdocs.org/sdr/2004FA0000915.md): Exhaust Rocker · broken · Oct 22, 2004 · N4068L · Cessna 421 · Reciprocating Engine Cylinder Section > 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 AND STUCK VALVE FOR NR 3 CYLINDER ON THE LEFT ENGINE. ALSO, NOTED IS AN APPARENT INCLUSION IN TH - [SDR 2004FA0000914](https://openairdocs.org/sdr/2004FA0000914.md): Rocker · broken · Oct 22, 2004 · N4068L · Cessna 421 · Reciprocating Engine Cylinder Section > 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 AND STUCK VALVE FOR NR 3 CYLINDER ON THE LEFT ENGINE. ALSO, NOTED IS AN APPARENT INCLUSION IN TH - [SDR AUS20020774](https://openairdocs.org/sdr/AUS20020774.md): Hose · transposed · Jul 24, 2002 · Cessna 421 · Engine Oil Distribution (Airframe Furnished) > (AUS) LH ENGINE OIL FILTER SUPPLY AND DISCHARGE HOSES TRANSPOSED. OIL FILTER RUPTURED. PERSONNEL/MAINTENANCE ERROR. - [SDR 2000ZZZX626](https://openairdocs.org/sdr/2000ZZZX626.md): Beam · cracked · Mar 14, 2000 · N3121K · Cessna 421 · Nacelle/Pylon, Main Frame > 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 1.1250 INCHES. THE OUTBOARD BEAM ASSEMBLY (5054030-13) ALSO HAD 3 RIVETS WITH HEADS MISSING ON THE INBO - [SDR 2000ZZZX625](https://openairdocs.org/sdr/2000ZZZX625.md): Manifold · cracked · Mar 14, 2000 · N3121K · Cessna 421 · Reciprocating Engine Power Section > 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 FOR ATTACHING THE INTERCOOLER. - [SDR 20000331SH025](https://openairdocs.org/sdr/20000331SH025.md): Stud · failed · Mar 6, 2000 · N421CH · Cessna 421 · Reciprocating Engine Cylinder Section > 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.md): Rudder Opening · contaminated · Dec 30, 1999 · N5AY · Cessna 421 · Vertical Stabilizer > 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 PLACE. - [SDR 99ZZZX302](https://openairdocs.org/sdr/99ZZZX302.md): Line · leaking · Dec 11, 1998 · N789AC · Cessna 421 · Engine Oil Distribution (Airframe Furnished) > 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 TURBOCHARGER OIL SUPPLY HOSE. INSPECTION OF THE TURBO OIL SUPPLY HOSE REVEALED THE HOSE WAS ROUTED IMPROP - [SDR 98ZZZX3931](https://openairdocs.org/sdr/98ZZZX3931.md): Hinge · loose · Oct 6, 1998 · N62DW · Cessna 421 · Ailerons > 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 SKIN IN ONE PLACE; AS WELL AS OUTER MOST PART OF REAR SPAR NOT BEING SUPPORTED WHEN AIR LOADS ARE - [SDR 98ZZZX3930](https://openairdocs.org/sdr/98ZZZX3930.md): Hinge · loose · Oct 6, 1998 · N62DW · Cessna 421 · Ailerons > 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 SKIN IN ONE PLACE; AS WELL AS OUTER MOST PART OF REAR SPAR NOT BEING SUPPORTED WHEN AIR LOADS ARE - [SDR 97ZZZX3153](https://openairdocs.org/sdr/97ZZZX3153.md): Alternator · failed · Jun 13, 1997 · N421Z · Cessna 421 · DC Generator-Alternator > 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.md): Gear · detached · Feb 6, 1997 · N4584L · Cessna 421 · Alternator-Generator Drive > PILOT LOST POWER FROM THE ALTERNATOR. UPON INVESTIGATING THE PROBLEM, DISCOVERED THE ALTERNATOR DRIVE GEAR HAD FALLEN OFF THE ALTERNATOR, INSIDE THE ENGINE, CAUSING SUBSTANTIAL DAMAGE IN THE FORWARD RIGHT-HAND HALF OF THE CRANKCASE. UPON DISASSEMBLY OF THE E - [SDR 97ZZZX1826](https://openairdocs.org/sdr/97ZZZX1826.md): Crank Gear · screws loose · Feb 6, 1997 · N4584L · Cessna 421 · Reciprocating Engine Rear Section > 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 LOOSE. SEE TELEDYNE CONTINENTAL MOTORS SIL 93-15 FOR CORRECT USE OF SAFETY WIRE, KEYS, AND LOCK TABS. - [SDR 97ZZZX1193](https://openairdocs.org/sdr/97ZZZX1193.md): Wastegate · cracked · Jan 1, 1997 · Cessna 421 · Exhaust Turbocharger > 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.md): Nut · corroded · Dec 1, 1996 · Cessna 421 · Propeller Assembly > NUT CORRODED. - [SDR EY2R9601307](https://openairdocs.org/sdr/EY2R9601307.md): Hub · corroded · Dec 1, 1996 · Cessna 421 · Propeller Hub Section > HUB FOUND CORRODED. - [SDR EY2R9601281](https://openairdocs.org/sdr/EY2R9601281.md): Blade · corroded · Dec 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE SHANK, SN K76153, FOUND CORRODED. - [SDR EY2R9601280](https://openairdocs.org/sdr/EY2R9601280.md): Blade · corroded · Dec 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE SHANK, SN K76140, FOUND CORRODED. - [SDR EY2R9601279](https://openairdocs.org/sdr/EY2R9601279.md): Blade · corroded · Dec 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE SHANK, SN K76136, FOUND CORRODED. - [SDR EY2R9601261](https://openairdocs.org/sdr/EY2R9601261.md): Blade · corroded · Dec 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE, SN C31669YS, FOUND CORRODED. - [SDR EY2R9601028](https://openairdocs.org/sdr/EY2R9601028.md): Slip Ring · corroded · Oct 1, 1996 · Cessna 421 · Propeller Assembly > CORROSION FOUND ON SPLIT RING. - [SDR EY2R9601027](https://openairdocs.org/sdr/EY2R9601027.md): Retain Bearing · corroded · Oct 1, 1996 · Cessna 421 · Propeller Assembly > RETAIN BEARING CORRODED. - [SDR EY2R9601026](https://openairdocs.org/sdr/EY2R9601026.md): Split Retainer · corroded · Oct 1, 1996 · Cessna 421 · Propeller Assembly > CORROSION FOUND ON SPLIT RETAINER. - [SDR EY2R9600914](https://openairdocs.org/sdr/EY2R9600914.md): Prop · corroded · Aug 1, 1996 · Cessna 421 · Propeller Assembly > PROP ASSY CORRODED - [SDR EY2R9601545](https://openairdocs.org/sdr/EY2R9601545.md): Feather Cylinder · defective · Jun 1, 1996 · Cessna 421 · Propeller Assembly > PROP ASSY FEATHER ASSY.067 LARGER THAN NORMAL - [SDR EY2R9600770](https://openairdocs.org/sdr/EY2R9600770.md): Dowel · corroded · Jun 1, 1996 · Cessna 421 · Propeller Assembly > DOWEL CORRODED. - [SDR EY2R9600757](https://openairdocs.org/sdr/EY2R9600757.md): Blade · corroded · Jun 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE FOUND CORRODED. - [SDR EY2R9600756](https://openairdocs.org/sdr/EY2R9600756.md): Blade · corroded · Jun 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE, SN OA037YS, FOUND CORRODED. - [SDR EY2R9600755](https://openairdocs.org/sdr/EY2R9600755.md): Blade · corroded · Jun 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE, SN HL062YS, FOUND CORRODED. - [SDR EY2R9600754](https://openairdocs.org/sdr/EY2R9600754.md): Blade · corroded · Jun 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE, SN HL080YS, FOUND CORRODED. - [SDR EY2R9600753](https://openairdocs.org/sdr/EY2R9600753.md): Hub · corroded · Jun 1, 1996 · Cessna 421 · Propeller Hub Section > HUB FOUND CORRODED. - [SDR EY2R9600752](https://openairdocs.org/sdr/EY2R9600752.md): Nut · corroded · Jun 1, 1996 · Cessna 421 · Propeller Assembly > NUT CORRODED. - [SDR EY2R9600751](https://openairdocs.org/sdr/EY2R9600751.md): Ferrule · corroded · Jun 1, 1996 · Cessna 421 · Propeller Assembly > FERRULE FOUND CORRODED. - [SDR EY2R9600750](https://openairdocs.org/sdr/EY2R9600750.md): Blade Act Pin · corroded · Jun 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE ACT PIN FOUND CORRODED. - [SDR EY2R9600749](https://openairdocs.org/sdr/EY2R9600749.md): Blade · corroded · Jun 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE, SN IA029, FOUND CORRODED. - [SDR EY2R9600071](https://openairdocs.org/sdr/EY2R9600071.md): Hub · cracked · Jun 1, 1996 · Cessna 421 · Propeller Hub Section > HUB ASSY CRACKED - [SDR EY2R9601502](https://openairdocs.org/sdr/EY2R9601502.md): Piston Rod Assy · worn · May 1, 1996 · Cessna 421 · Propeller Assembly > PROP ASSY PISTON ROD ASSY IS WORN - [SDR EY2R9600618](https://openairdocs.org/sdr/EY2R9600618.md): Propeller · corroded · May 1, 1996 · Cessna 421 · Propeller Assembly > EXCESSIVE INTERNAL DAMAGE & CORR - [SDR EY2R9600617](https://openairdocs.org/sdr/EY2R9600617.md): Act Pin Assy · corroded · May 1, 1996 · Cessna 421 · Propeller Assembly > ACT PIN ASSY FOUND CORRODED. - [SDR EY2R9600616](https://openairdocs.org/sdr/EY2R9600616.md): Act Pin Assy · corroded · May 1, 1996 · Cessna 421 · Propeller Assembly > ACT PIN ASSY FOUND CORRODED. - [SDR EY2R9600612](https://openairdocs.org/sdr/EY2R9600612.md): Retain Bearing · corroded · May 1, 1996 · Cessna 421 · Propeller Assembly > RETAIN BEARING FOUND WITH CORROSION. - [SDR EY2R9600061](https://openairdocs.org/sdr/EY2R9600061.md): Hub · cracked · May 1, 1996 · Cessna 421 · Propeller Hub Section > HUB CRACKED IN RETENTION THREADS - [SDR EY2R9600060](https://openairdocs.org/sdr/EY2R9600060.md): Hub · cracked · May 1, 1996 · Cessna 421 · Propeller Hub Section > HUB CRACKED IN RETENTION THREADS - [SDR EY2R9601480](https://openairdocs.org/sdr/EY2R9601480.md): Hub · stripped · Apr 1, 1996 · Cessna 421 · Propeller Hub Section > PROP ASSY HUB DOWEL PIN HOLE STUD STRIPPED - [SDR EY2R9600524](https://openairdocs.org/sdr/EY2R9600524.md): Cylinder Pin · corroded · Apr 1, 1996 · Cessna 421 · Propeller Assembly > CORROSION FOUND ON CYLINDER PIN. - [SDR EY2R9600523](https://openairdocs.org/sdr/EY2R9600523.md): Blade · corroded · Apr 1, 1996 · Cessna 421 · Propeller Blade Section > BLADE, SN B24646YS, FOUND CORRODED. Next page: https://openairdocs.org/model/cessna-421/reports.md?page=2 ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet' WHERE aircraft_model_key = '421' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/cessna-421/reports --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.