Type Record · As of May 3, 2026
GRUMMAN G-21
Fixed Wing Multi Engine · P&W R-985 SERIES
Registered
1
Year Range
1944–1944
NTSB Events
2
Airworthiness Directives
0
Aircraft Resources
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered GRUMMAN G-21 aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- AK 100.0% 1
By Decade of Manufacture
- 1940s 100.0% 1
02 / NTSB Records
Events involving GRUMMAN G-21 aircraft
2 event(s) on file. Showing the most recent 2.
-
May 10, 1975
N159FDURANGO, Colorado
NTSB Docket → -
Jan 6, 1974
N159FSOUTH FORK, Colorado Minor
NTSB Docket →
03 / Airworthiness Directives
FAA directives applicable to GRUMMAN G-21
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-21
184 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.
-
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
-
05/24/2019
STC SA02019SE-D (1 OF 3)
Installation of Garmin GTN 6XX/7XX Navigation System
Garmin International Inc
-
05/24/2019
STC SA02019SE-D (1 OF 2)
Installation of Garmin GTN 6XX/7XX Navigation System
Garmin International Inc
-
05/24/2019
STC SA02019SE-D (3 OF 3)
Installation of Garmin GTN 6XX/7XX Navigation System
Garmin International Inc
-
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
+ 154 more STCs on file
07 / PMA replacement parts
FAA-approved replacement parts for GRUMMAN G-21
3 parts on file from the FAA Parts Manufacturer Approval database. Each is a non-OEM part the FAA has authorized for use as a replacement on this aircraft type.
-
#https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID100310162620220706160144.0001##
LoPresti Speed Merchants
PMA holder → -
#https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID177213093320210702175226.0001##
Aspen Avionics
PMA holder → -
#https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID909056415920210622142508.0001##
AeroLEDs LLC
PMA holder →
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for GRUMMAN G-21
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 1 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 |
|---|---|---|---|---|
| N159F | AK | 1944 | ● | 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 →