Fixed Wing Single Engine · as of May 3, 2026
Distribution · currently registered
By state (top 10)
- CA 100.0% 1
By decade of manufacture
- Unknown 100.0% 1
NTSB records
No NTSB-recorded events match STEARMAN AIRCRAFT/NORTHROP ALPHA 4-A in the indexed corpus.
Airworthiness directives
No matching airworthiness directives are on file for this make and model in the Federal Register.
Type certificate data sheets · 1 match in the FAA catalog
- ATC 461 Stearman Aircraft Company Current Rev 0 ·
Models: Alpha 4-A
Supplemental type certificates · 4 on file
- 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 DRS ↗
- 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 DRS ↗
- 07/08/2005 STC SA00680SE (4 OF 6 Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer. Electronics International DRS ↗
- 03/09/1999 STC SA00680SE (4 OF 6 Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer. Electronics International DRS ↗
Advisory circulars & Federal Register
Advisory circulars
No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.
Recent Federal Register · Parts 91 & 43
- 2026-09-14 Use of Certain Restricted Category Aircraft for the Transport of Firefighters for Wildfire Suppression FR ↗
- 2026-07-31 Requirements for Interference-Tolerant Radio Altimeter Systems FR ↗
- 2026-07-02 Enabling Supersonic Overland Flight FR ↗
- 2026-07-01 Mechanic Certification: Inspection Rating and Recent Experience Requirements FR ↗
- 2026-06-30 Designation-Restrict the Operation of Unmanned Aircraft in Close Proximity to a Fixed Site Facility; Extension of Comment Period FR ↗
Registered N-numbers · 1
1 of 1 ● NTSB events on file · orange tails have Atlas pages · Look up queries the live FAA registry (owner, address, last airworthiness)
| N-number | St | Year | NTSB | FAA |
|---|---|---|---|---|
| N990NC | CA | — | · | Look up ↗ |
Source — FAA Aircraft Registry
Sources
- 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