Type Record · As of May 3, 2026
PORTERFIELD CP-50
Fixed Wing Single Engine · CONT MOTOR A50 SERIES
Registered
8
Year Range
1939–1948
NTSB Events
2
Airworthiness Directives
0
Aircraft Resources
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered PORTERFIELD CP-50 aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- OR 12.5% 1
- CA 12.5% 1
- IA 12.5% 1
- WA 12.5% 1
- MI 12.5% 1
- AR 12.5% 1
- DE 12.5% 1
- MO 12.5% 1
By Decade of Manufacture
- 1930s 37.5% 3
- 1940s 37.5% 3
- Unknown 25.0% 2
02 / NTSB Records
Events involving PORTERFIELD CP-50 aircraft
2 event(s) on file. Showing the most recent 2.
-
Apr 7, 1979
N25422SUNOL, California Minor
NTSB Docket → -
Aug 6, 1966
N21973YAMHILL, Oregon
NTSB Docket →
03 / Airworthiness Directives
FAA directives applicable to PORTERFIELD CP-50
No matching airworthiness directives are on file for this make and model in the Federal Register.
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for PORTERFIELD CP-50
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 8 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 |
|---|---|---|---|---|
| N21973 | OR | 1939 | ● | Look up ↗ |
| N21987 | CA | 1939 | · | Look up ↗ |
| N21994 | IA | 1939 | · | Look up ↗ |
| N25422 | WA | — | ● | Look up ↗ |
| N25436 | MI | 1940 | · | Look up ↗ |
| N25437 | AR | — | · | Look up ↗ |
| N25439 | DE | 1948 | · | Look up ↗ |
| N25495 | MO | 1940 | · | 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 →