# N22932: 1946 Grumman G-21A - Status: Valid registration - Airframe: [Grumman G-21A](https://openairdocs.org/model/grumman-g-21a) (registry code 3951204, 8 seats) - Engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008) - Data sheets: [TCDS TC 654](https://openairdocs.org/tcds/TC%20654) (Frakes Aviation) (OpenAirDocs) - Serial number: B-139 - Year built: 1946 - Type: Fixed wing multi engine - Engine type: Reciprocating - Airworthiness: Standard, normal - Airworthiness date: July 17, 1978 - Certificate issued: October 9, 2025 - Expires: October 31, 2032 - Mode S code: A2054C - Registered owner: [Runyon Aviation LLC](https://openairdocs.org/faa-owner/RUNYON%20AVIATION%20LLC) - Location: [Fort Worth, TX](https://openairdocs.org/faa-place/TX/Fort%20Worth) - Owner type: LLC - Owner's area on the map: 32.7007° N, 97.3870° W: Placed by OpenAirDocs at the center of ZIP code 76109, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=22932 - Page: https://openairdocs.org/aircraft/N22932 From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Pratt & Whitney R-985 model are included. ## ADs that may apply (OpenAirDocs): 10 in force ### Matched by airframe (Grumman G-21A) - [AD 79-02-03](https://openairdocs.org/ad/79-02-03): Engine Restart · Grumman American G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B) with STC SA1-52. Effective Jan 29, 1979 - [AD 73-12-06](https://openairdocs.org/ad/73-12-06): Elevator and Rudder Torque Tube Failure · Grumman American G-21 and G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B). Effective Jun 14, 1973 - [AD 72-11-03](https://openairdocs.org/ad/72-11-03): Engine Fuel Starvation · Grumman American G-21 and G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B). Effective May 30, 1972 - [AD 53-24-01](https://openairdocs.org/ad/53-24-01): Stabilizer Strut Terminal · Grumman American G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B). Effective Aug 17, 1971 - [AD 71-12-03](https://openairdocs.org/ad/71-12-03): Flex Drive Elevator Tab Control · Grumman American G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B). Effective Jun 10, 1971 - [AD 63-27-02](https://openairdocs.org/ad/63-27-02): Rudder Control Push Rod End Fittings · Grumman American G-21 and G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B). Effective Jan 20, 1964 - [AD 53-21-02](https://openairdocs.org/ad/53-21-02): Horizontal Stabilizer Strut · Grumman American G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B) - [AD 50-15-01](https://openairdocs.org/ad/50-15-01): Mixture Control Rework · Grumman American G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B) - [AD 49-16-01](https://openairdocs.org/ad/49-16-01): Fuel Tank Baffles · Grumman American G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B) - [AD 46-38-01](https://openairdocs.org/ad/46-38-01): Vacuum System Tubing · Grumman American G-21 and G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B) ### Matched by engine (Pratt & Whitney R-985 series) None in force. ## Information bulletins (advisory) None matched. ## NTSB investigations (4) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ANC04LA038](https://openairdocs.org/ntsb/ANC04LA038), Apr 5, 2004: Grumman G21 (N22932), Unalaska, AK, substantial damage. Probable cause: The inadvertent ground loop/swerve by the second pilot during the landing roll, and the first (check) pilot's inadequate supervision of the second pilot, which resulted in a loss of control and… - [NTSB ANC98LA038](https://openairdocs.org/ntsb/ANC98LA038), Apr 15, 1998: Grumman G-21 (N22932), Dutch Harbor, AK, substantial damage. Probable cause: The pilot-in-command's failure to identify the swells prior to landing. A factor was the water swells. - [NTSB ANC93IA026](https://openairdocs.org/ntsb/ANC93IA026), Jan 7, 1993: Grumman G-21A (N22932), Akutan, AK, incident, minor damage. Probable cause: THE INCIDENT WAS CAUSED BY THE PILOTS IMPROPER COMPENSATION FOR THE WINDS. FACTORS WERE THE MICROBURST, THE ROUGH WATER, AND THE PILOT'S INADEQUATE EVALUATION OF THE WEATHER CONDITIONS. - [NTSB LAX79FA084](https://openairdocs.org/ntsb/LAX79FA084), Sep 17, 1979: Grumman G-21A (N22932), Avalon, CA, substantial damage, 1 fatal ## FAA accident and incident reports (6) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Accident 20040404006449A](https://openairdocs.org/incident/20040404006449A), Apr 4, 2004: Grumav G21A (N22932), Unalaska, AK, Substantial damage. (-23) The flying pilot at the time of the accident was the second-in-command (SIC), [privacy data omitted]. [privacy data omitted] Had received a 14 CFR, part… - [Accident 19980415006889A](https://openairdocs.org/incident/19980415006889A), Apr 15, 1998: Grumav G21 (N22932), Unalaska, AK, Substantial damage. Unable land amphibian at dut. Landed on wataer to await clearing. Porpoised on a swell damaged horizontal stabilize. (From .4) the pilot landed the seaplane in… - [Incident 19930107000249I](https://openairdocs.org/incident/19930107000249I), Jan 7, 1993: Grumav G21A (N22932), Akutan, AK, Minor damage. On water landing pilot reported wind gust. Bounced. Aircraft then hit water with left wing low. Float broke off. - [Incident 19861107072769I](https://openairdocs.org/incident/19861107072769I), Nov 7, 1986: Grumav G21A (N22932), Kodiak, AK, Minor damage. During turn wing float submerged and float attachment fitting broke. Float separated and aircraft capsized. - [Accident 19790917036239A](https://openairdocs.org/incident/19790917036239A), Sep 17, 1979: Gruman G21A (N22932), Catalina Island, CA, Substantial damage, 1 fatal. Elevator control cable parted just after liftoff. Amphibian hit water, nose down, sank. - [Incident 19790307018879I](https://openairdocs.org/incident/19790307018879I), Mar 7, 1979: Grumav G21A (N22932), Long Beach, CA, Minor damage. Left engine quit, right engine ran intermittently during takeoff. Probable fuel cell design problem plus line clog. ## Service difficulty reports (3) As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR 2006FA0000740](https://openairdocs.org/sdr/2006FA0000740), Aug 4, 2006: EXHAUST DUCT. CRACKED. EXHAUST DUCT ASSY CRACKED AND MISSING PARTS. - [SDR PNSA051105](https://openairdocs.org/sdr/PNSA051105), Nov 17, 2005: COWLING. DEPARTED. WHILE IN CRUISE FLIGHT THE LT ENGINE COWLING DEPARTED THE AIRCRAFT. THE COWLING'S WAS NOT RECOVERED, FLIGHT WAS OVER WATER. AN UNEVENTFUL LANDING WAS MADE. SINC - [SDR PNSA970203](https://openairdocs.org/sdr/PNSA970203), Feb 19, 1997: FLOAT. DAMAGED. DAMAGED RT FLOAT DURING TAXI UP BOAT RAMP. ## STCs that may be installed (OpenAirDocs) (40) Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do. ### Approved for the airframe (Grumman G-21A) - [STC SA02571SE](https://openairdocs.org/stc/SA02571SE): Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display). Garmin International Inc - [STC SA04837NY](https://openairdocs.org/stc/SA04837NY): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights. AeroLED's Holdings, LLC - [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC - [STC SA02738CH](https://openairdocs.org/stc/SA02738CH): Installation of L-3 Communications Avionics Systems. Acron Aviation Inc - [STC SA04046CH PAGE 1](https://openairdocs.org/stc/SA04046CH%20PAGE%201): Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500). Acron Aviation Inc - [STC SA39CH](https://openairdocs.org/stc/SA39CH): Installation of an Amphibian Landing Gear Position Advisory System/Laser Gear Advisory System. Wipaire Inc - [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC - [STC SA00346SE](https://openairdocs.org/stc/SA00346SE): Installation of Cleveland wheels and a modified Cleveland braking system per Cleveland Wheels & Brakes Drawing 50-83, Revision B, sketches labeled Drawing #1 - #4, and photographs dated may 7, 1996. CAS AeroSolutions LLC - [STC SA02444AK](https://openairdocs.org/stc/SA02444AK): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed. ADS-B Technologies LLC - [STC SA11174SC PAGE 1](https://openairdocs.org/stc/SA11174SC%20PAGE%201): Installation of BendixKing by Honeywell KSN 770 and KSN 765 WAAS LPV approach capable nav/comm systems. Honeywell International Inc (Bendix King) - [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc - [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 SA02153LA-D PAGE 1](https://openairdocs.org/stc/SA02153LA-D%20PAGE%201): Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System. Garmin International Inc - [STC SA6070NM](https://openairdocs.org/stc/SA6070NM): Installation of a 'quick-disconnect drain plug' on the engine rocker sump for the oil drain retrieval system after engine shutdown. West Coast Air Creations - [STC SA01282NY](https://openairdocs.org/stc/SA01282NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K015 on aircraft powered by Pratt & Whitney radial reciprocating engine Series R-985, R-1340 and R-1830. Airwolf Filter Corporation - [STC SA02212AK](https://openairdocs.org/stc/SA02212AK): Replacement of existing landing and/or taxi light reflector and bulbs with high intensity discharge (HID) lighting systems. Seaplanes North LLC - [STC SA00382BO](https://openairdocs.org/stc/SA00382BO): Installation of Globalstar Antenna and Cradle provisions to support a Globalstar GPS-1700 in non-composite airplanes. Avidyne Corporation - [STC SA02428SE](https://openairdocs.org/stc/SA02428SE): Installation of an Air Stream Switch for an electric time recording device on non-pressurized aircraft. Henry F Rogers/David E Polley - [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 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 SA02119SE PAGE 1](https://openairdocs.org/stc/SA02119SE%20PAGE%201): Installation of Garmin GDL 88 ADS-B UAT Transceiver System. Garmin International Inc - [STC SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric. Aviation Products Systems Inc - [STC SA02442AK PAGE 1](https://openairdocs.org/stc/SA02442AK%20PAGE%201): Approval of the L-3 Communications NGT 2000/2500 ADS-B system. ADS-B Technologies, LLC - [STC SA02121SE](https://openairdocs.org/stc/SA02121SE): Installation of Garmin GTS 825 (TAS) or GTS 855 (TCAS I) Traffic System. Garmin International Inc - [STC SA00432SE](https://openairdocs.org/stc/SA00432SE): Installation of EGT 701 series fuel flow instrument. J P Instruments - [STC SA00861SE](https://openairdocs.org/stc/SA00861SE): Installation of J.P. Instruments (JPI) fuel flow indicating system. J P Instruments - [STC SA03148NY](https://openairdocs.org/stc/SA03148NY): The installation of the Latitude Technologies Corporation S100 Tracking System. Latitude Technologies Corporation - [STC SA02016SE-D](https://openairdocs.org/stc/SA02016SE-D): Installation of Garmin GTS 800, GTS 820 or GTS 850 Traffic System. Garmin International Inc - [STC SA02018SE-D](https://openairdocs.org/stc/SA02018SE-D): Provisions installation of Garmin GPS/XM Antennas in accordance with FAA Approved Model List (AML) SA02018SE-D, dated January 4, 2011, or later FAA approved revision, and FAA Approved GPS/XM Antenna STC Master Drawing List, Document No.: 005-00638-01, Revision 1 , approved on January 4, 2011, or later FAA approved revision. Garmin International Inc - [STC ST02540AT-D](https://openairdocs.org/stc/ST02540AT-D): Installation of replacement fuel tank sealant system. FFC Manufacturing - [STC SA101WE](https://openairdocs.org/stc/SA101WE): Installation of picture window. Atlantic Coast Sea Planes LLC - [STC SA4-1467](https://openairdocs.org/stc/SA4-1467): Installation of retractable tip floats. Atlantic Coast Sea Planes LLC - [STC SA8075SW](https://openairdocs.org/stc/SA8075SW): Installation of fiberglass covering. (M-62 SERIES PT-19) (G-73 SCHWEIZER). Razorback Fabrics Inc - [STC SA5714NM](https://openairdocs.org/stc/SA5714NM): Installation of electric propeller deicer kit. Teufel Nursery Inc - [STC SA96NW](https://openairdocs.org/stc/SA96NW): Installation of Sorm Industries horizontal stabilizer forward support fitting. Sorm Industries - [STC SA138SW](https://openairdocs.org/stc/SA138SW): Modify models for operation at a maximum gross weight of 9,000 pounds by installing retractable wing tip floats and 24 volt electrical system. Pan Air Corporation - [STC SA551SW](https://openairdocs.org/stc/SA551SW): Modify Beechcraft C18 cowl to fit Grumman G-21A. Pan Air Corporation - [STC SA552WE](https://openairdocs.org/stc/SA552WE): Installed Stewart-Warner 47,000 BTU Heater. McKinnon Enterprises Inc - [STC SA02153LA-D](https://openairdocs.org/stc/SA02153LA-D) (historical): Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System. Garmin International Inc - [STC SA02153LA](https://openairdocs.org/stc/SA02153LA) (historical): Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System. Garmin AT Inc ## Earlier aircraft with N22932 The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N22932 before. - [Cancelled 1969-06-16](https://openairdocs.org/deregistered/N22932-1969-06-16): Cessna 150H, S/N 15068625. Owner: [Saint Aircraft Sales Inc](https://openairdocs.org/faa-owner/SAINT%20AIRCRAFT%20SALES%20INC), [St Petersburg, FL](https://openairdocs.org/faa-place/FL/St%20Petersburg) - [Cancelled 1940-11-15](https://openairdocs.org/deregistered/N22932-1940-11-15): Piper J3C-50, S/N 2826. Owner: [Louis Daniel Pepper Jr](https://openairdocs.org/faa-owner/LOUIS%20DANIEL%20PEPPER%20JR), [Greenwood, MS](https://openairdocs.org/faa-place/MS/Greenwood) ## Related - Other Grumman G-21A aircraft: https://openairdocs.org/model/grumman-g-21a/aircraft.md - The Pratt & Whitney R-985 series engine: https://openairdocs.org/engine/pratt-whitney-r-985-series.md --- 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.