Type Record · As of May 3, 2026
WEATHERLY AVIATION CO INC 620A
Fixed Wing Single Engine · P&W R-985 SERIES
Registered
6
Year Range
1991–1992
NTSB Events
1
Airworthiness Directives
0
Aircraft Resources
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered WEATHERLY AVIATION CO INC 620A aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- CO 50.0% 3
- IL 16.7% 1
- ND 16.7% 1
- SD 16.7% 1
By Decade of Manufacture
- 1990s 50.0% 3
- Unknown 50.0% 3
02 / NTSB Records
Events involving WEATHERLY AVIATION CO INC 620A aircraft
1 event(s) on file. Showing the most recent 1.
-
Aug 10, 2003
N4656MDoland, South Dakota
NTSB Docket →
03 / Airworthiness Directives
FAA directives applicable to WEATHERLY AVIATION CO INC 620A
No matching airworthiness directives are on file for this make and model in the Federal Register.
04 / Type Certificate Data Sheets
FAA TCDS for WEATHERLY AVIATION CO INC 620A
The TCDS is the legal certification document — weight limits, performance, equipment, AD compliance times, operating limitations. 1 match in the FAA catalog.
- A26WE Current Rev 7 · 12/03/2001
Weatherly Aircraft Company
Models: 620B-TG, 620, 620A, 620TP + 1 more
06 / Supplemental Type Certificates
Modifications approved for WEATHERLY AVIATION CO INC 620A
55 STCs on file — every FAA-approved modification, alteration, or installation for this aircraft. STOL kits, avionics, fuel systems, floats, engine swaps, you name it.
-
03/01/2025
STC SA7965SW
Application of fabric and polyurethane finishing system.
Shady Aviation LLC
-
08/21/2024
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
09/01/2022
STC SA01967WI (3 OF3)
Use of GAMI G100UL High Octane Unleaded Avgas
General Aviation Modifications Inc.
-
07/27/2022
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
07/27/2020
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
Petersen Aviation Inc
-
06/04/2020
STC SA02268CH (PAGE 6)
Installation of Airwolf Filter Corp. Air Oil Separator
Airwolf Filter Corporation
-
09/25/2019
STC SA5190NM
Installation of Gustin Aviation chip detector light system.
A & L Aircraft Parts Inc
-
02/11/2019
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
ADI LLC
-
08/27/2018
STC SA5190NM
Installation of Gustin Aviation chip detector light system.
A & L Aircraft Parts, Inc
-
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
-
03/01/2018
STC SA7965SW
Application of fabric and polyurethane finishing system.
Air Tech Coatings
-
12/20/2017
STC SA02268CH (PAGE 6)
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
-
03/29/2017
STC SA5190NM
Installation of Gustin Aviation chip detector light system.
A & L Aircraft Parts, Inc
-
01/24/2017
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
Petersen Aviation Inc
-
08/27/2016
STC SA01240SE (5 OF 5)
Installation of secondary voltage indication system
Visual Instruments LLC
-
05/20/2016
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
03/09/2016
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Petersen Aviation Inc
-
10/28/2015
STC SA01757WI
To allow the use of UL91 (minimum) grade aviation fuel
Petersen Aviation Inc
-
06/30/2014
STC SA02283SE Page 2
Installation of Electronics International Inc. Glass Panel Engine Monitor (with In Flight Data) CGR-30P
Electronics International Inc.
-
06/24/2014
STC SA02402SE Page 2
Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data) CGR-30C
Electronics International Inc.
-
12/10/2013
STC SA02283SE Page 2
Installation of Electronics International Inc. Glass Panel Engine Monitor (with In Flight Data) CGR-30P
Electronics International Inc.
-
08/27/2013
STC SA02283SE Page 2
Installation of Electronics International Inc. Glass Panel Engine Monitor (with In Flight Data) CGR-30P
Electronics International Inc.
-
07/25/2013
STC SA02283SE Page 2
Installation of Electronics International Inc. Glass Panel Engine Monitor (with In Flight Data) CGR-30P
Electronics International Inc.
-
10/31/2012
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
-
08/28/2011
STC SA02268CH (PAGE 6)
Installation of Airwolf Filter Corp. Air Oil Separator
Airwolf Filter Corporation
-
12/09/2009
STC SA2693NM (PAGE 2)
Installation of Electronics International digital volt/amp gauges and accessories.
Electronics International Inc.
-
04/16/2009
STC SA01988SE (PAGE 4)
Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data) MVP-50P.
Electronics International Inc.
-
07/19/2008
STC SA2586NM (PAGE 4)
Installation of J.P. Instruments temperature monitoring systems.
J P Instruments
+ 25 more STCs on file
07 / PMA replacement parts
FAA-approved replacement parts for WEATHERLY AVIATION CO INC 620A
2 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.
-
7655T (24 Volt)#https://drs.faa.gov/browse/excelExternalWindow/E026E149E69CD1DA86257CD7004C838E.0001##
Alternator
Hartzell Engine Technologies LLC replaces Modification Part
PMA holder → -
R1224J#https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID700580691220211209184321.0001##
Alternator Controller (Voltage Regulator)
Hartzell Engine Technologies LLC replaces J12M24SP
PMA holder →
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for WEATHERLY AVIATION CO INC 620A
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 6 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 |
|---|---|---|---|---|
| N4627G | CO | 1991 | · | Look up ↗ |
| N4628U | CO | — | · | Look up ↗ |
| N4640D | CO | — | · | Look up ↗ |
| N46455 | IL | 1991 | · | Look up ↗ |
| N4647E | ND | — | · | Look up ↗ |
| N4656M | SD | 1992 | ● | 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 →