Type Record · As of May 3, 2026
GRUMMAN G-21A
Fixed Wing Multi Engine · P&W R-985 SERIES
Registered
34
Year Range
1939–1962
NTSB Events
27
Airworthiness Directives
0
Aircraft Resources
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered GRUMMAN G-21A aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- CA 17.6% 6
- DE 8.8% 3
- TX 8.8% 3
- AK 8.8% 3
- NY 5.9% 2
- CT 5.9% 2
- MI 5.9% 2
- FL 2.9% 1
- PA 2.9% 1
- MT 2.9% 1
+10 more states
By Decade of Manufacture
- 1930s 5.9% 2
- 1940s 58.8% 20
- 1950s 11.8% 4
- 1960s 2.9% 1
- Unknown 20.6% 7
02 / NTSB Records
Events involving GRUMMAN G-21A aircraft
27 event(s) on file. Showing the most recent 25 · 2 more available on NTSB CAROL.
-
Apr 9, 2008
N741Unalaska, Alaska Serious
NTSB Docket → -
Jan 29, 2008
N21AMarathon, Florida Serious
NTSB Docket → -
Jun 24, 2007
N7811Dutch Harbor, Alaska
NTSB Docket → -
Feb 15, 2005
N327Penn Yan, New York Minor
NTSB Docket → -
Apr 4, 2004
N22932Unalaska, Alaska
NTSB Docket → -
Jun 17, 2002
N21ANorthway, Alaska
NTSB Docket → -
Mar 25, 1999
N5548ALAUDERDALE LAKE, Florida Fatal
NTSB Docket → -
Apr 15, 1998
N22932DUTCH HARBOR, Alaska
NTSB Docket → -
Jul 22, 1994
N327BREMERTON, Washington
NTSB Docket → -
Mar 21, 1994
N741MT. FAIRWEATHER Minor
NTSB Docket → -
Jan 7, 1993
N22932AKUTAN, Alaska
NTSB Docket → -
Apr 17, 1991
N9750ZSPOKANE, Washington
NTSB Docket → -
Jun 29, 1990
N7811KING SALMON, Alaska Minor
NTSB Docket → -
Dec 23, 1985
N9074USONORA, Texas Serious
NTSB Docket → -
Jul 20, 1980
N9750ZJUNEAU, Alaska Serious
NTSB Docket → -
Sep 17, 1979
N22932AVALON, California Fatal
NTSB Docket → -
Dec 3, 1978
N6DFWHEELING, Illinois Fatal
NTSB Docket → -
Nov 11, 1978
N95467AKUTAN BAY, Alaska
NTSB Docket → -
Mar 12, 1977
N329ATLANTA, Georgia Serious
NTSB Docket → -
Jan 10, 1970
N329AVALON, California
NTSB Docket → -
Apr 2, 1969
N22932OLDSMAR, Florida
NTSB Docket → -
Dec 5, 1967
N95467TORTOLA, Other Foreign
NTSB Docket → -
Aug 30, 1967
N74588PRINCE RUPERT, CD
NTSB Docket → -
May 27, 1966
N789ANCHORAGE, Alaska
NTSB Docket → -
Mar 19, 1966
N5548AC.AMALIE ST.TH., VI
NTSB Docket →
03 / Airworthiness Directives
FAA directives applicable to GRUMMAN G-21A
No matching airworthiness directives are on file for this make and model in the Federal Register.
06 / Supplemental Type Certificates
Modifications approved for GRUMMAN G-21A
196 STCs on file — every FAA-approved modification, alteration, or installation for this aircraft. STOL kits, avionics, fuel systems, floats, engine swaps, you name it.
-
04/01/2025
STC SA02738CH (PAGE 1)
Installation of L-3 Communications Avionics Systems
Acron Aviation Inc.
-
04/01/2025
STC SA04046CH Page 1
Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500)
Acron Aviation Inc.
-
10/23/2024
STC SA39CH
Installation of an Amphibian Landing Gear Position Advisory System/Laser Gear Advisory System
Wipaire Inc.
-
08/21/2024
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
05/17/2024
STC SA4503NM (PAGE 1)
Remove original cloth covering and install Ceconite covering
Ceconite Division of Poly-Fiber Inc.
-
12/12/2023
STC SA02571SE (PAGE 1)
Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).
Garmin International Inc.
-
12/12/2022
STC SA02738CH (PAGE 1)
Installation of L-3 Communications Avionics Systems
L3Harris Aviation Products Inc.
-
12/12/2022
STC SA04046CH Page 1
Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500)
L3Harris Aviation Products Inc.
-
09/19/2022
STC SA99GL
Installation of Cleveland Main Wheels and Brakes.
Kaman Corporation Aircraft Wheel and Brake LLC
-
09/09/2022
STC SA4503NM (PAGE 1)
Install Ceconite covering material.
Ceconite Division of Poly-Fiber Inc
-
07/27/2022
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
05/19/2022
STC SA04776NY (1 OF 2)
The HIPEC Covering and Finishing System must be performed and maintained
HIPEC Aircraft Coatings Inc.
-
05/18/2022
STC SA04776NY (2 OF2)
The HIPEC Covering and Finishing System must be performed and maintained
HIPEC Aircraft Coatings Inc.
-
04/15/2022
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 …
CAS AeroSolutions LLC
-
03/30/2022
STC SA02444AK (PAGE 1)
Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed
ADS-B Technologies LLC
-
02/02/2022
STC SA02571SE (PAGE 1)
Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).
Garmin International Inc
-
09/01/2021
STC SA11174SC PAGE 1
Installation of BendixKing by Honeywell KSN 770 and KSN 765 WAAS LPV approach capable nav/comm systems
Honeywell International Inc (Bendix King)
-
07/09/2021
STC SA02571SE (PAGE 1)
Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).
Garmin International Inc
-
07/27/2020
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
Petersen Aviation Inc
-
06/04/2020
STC SA02268CH (PAGE 5)
Installation of Airwolf Filter Corp. Air Oil Separator
Airwolf Filter Corporation
-
06/19/2019
STC SA00344BO PAGE 1
Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights.
Whelen Aerospace Technologies
-
02/11/2019
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
ADI LLC
-
04/26/2018
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
-
03/13/2018
STC SA6070NM
Installation of a 'quick-disconnect drain plug' on the engine rocker sump for the oil drain retrieval system after engine shutdown.
Richard Zeiler
-
12/20/2017
STC SA02268CH (PAGE 5)
Installation of Airwolf Filter Corp. Air Oil Separator
Airwolf Filter Corporation
-
12/20/2017
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
-
11/17/2017
STC SA02571SE (Page 1)
Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).
Garmin International Inc
-
10/30/2017
STC SA02212AK (PG 1)
Replacement of existing landing and/or taxi light reflector and bulbs with high intensity discharge (HID) lighting systems
Seaplanes North LLC
-
09/20/2017
STC SA2586NM
Installation of J.P. Instruments temperature monitoring systems.
J P Instruments
-
07/10/2017
STC SA39CH
Installation of amphibian landing gear position advisory system.
Wipaire Inc
+ 166 more STCs on file
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for GRUMMAN G-21A
Advisory Circulars
No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.
Recent Federal Register activity
Latest rulemakings touching general operating rules (Part 91) and maintenance rules (Part 43).
- 2026-04-17 Settlement Policy for Small Unmanned Aircraft System (UAS) Cases FR ↗
- 2026-02-10 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period; Denial of Extension FR ↗
- 2026-02-02 25-Hour Cockpit Voice Recorder (CVR) Requirement, New Aircraft Production FR ↗
- 2026-01-28 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period FR ↗
- 2026-01-07 Requirements for Interference-Tolerant Radio Altimeter Systems FR ↗
05 / Aircraft of this type
All 34 registered N-numbers
Every tail currently on the FAA registry for this make/model. Click an N-number to query the FAA Aircraft Inquiry; rows flagged ● have NTSB events on file. Tails seeded with full TallyAero pages link directly.
| N-number | St | Year | NTSB | FAA |
|---|---|---|---|---|
| N1019N | FL | 1946 | · | Look up ↗ |
| N121SR | DE | 1940 | · | Look up ↗ |
| N21A | DE | 1946 | ● | Look up ↗ |
| N22932 | TX | 1946 | ● | Look up ↗ |
| N270DB | PA | 1944 | · | Look up ↗ |
| N291VW | CA | 1942 | · | Look up ↗ |
| N327 | NY | 1958 | ● | Look up ↗ |
| N329 | CA | 1945 | ● | Look up ↗ |
| N345GG | DE | — | · | Look up ↗ |
| N39FG | CA | 1939 | · | Look up ↗ |
| N401SJ | CA | 1943 | · | Look up ↗ |
| N42GL | MT | — | · | Look up ↗ |
| N4575C | WY | — | · | Look up ↗ |
| N48550 | AL | 1939 | · | Look up ↗ |
| N5548A | CT | 1959 | ● | Look up ↗ |
| N600ZE | TN | 1943 | · | Look up ↗ |
| N68157 | TX | 1947 | · | Look up ↗ |
| N69263 | MI | 1944 | · | Look up ↗ |
| N6DF | ID | 1945 | ● | Look up ↗ |
| N703 | AK | 1946 | · | Look up ↗ |
| N7211 | CT | 1944 | · | Look up ↗ |
| N741 | NY | 1946 | ● | Look up ↗ |
| N74588 | TX | 1962 | ● | Look up ↗ |
| N778 | MN | 1943 | · | Look up ↗ |
| N7811 | OR | 1942 | ● | Look up ↗ |
| N7821 | CA | — | · | Look up ↗ |
| N789 | AK | 1943 | ● | Look up ↗ |
| N88821 | AK | 1942 | · | Look up ↗ |
| N9074N | CA | — | · | Look up ↗ |
| N9074U | MI | — | ● | Look up ↗ |
| N95467 | WA | 1942 | ● | Look up ↗ |
| N9750Z | IA | — | ● | Look up ↗ |
| N985R | MA | 1951 | · | Look up ↗ |
| N9KL | MO | 1956 | · | Look up ↗ |
Source — FAA Aircraft Registry · click "Look up" to query the live registry record (owner, address, last airworthiness)
05 / Sources & Methodology
Every count traces back to a primary US-government source
- FAA Aircraft Registry →
Refreshed Apr 27, 2026
Available
- NTSB CAROL →
Refreshed Apr 27, 2026
Available
- Federal Register (FAA Airworthiness Directives) →
Refreshed Apr 27, 2026
Available
We render counts and lists as the agency publishes them. Read the methodology →