# N9924U: 1978 Grumman American Avn. AA-1C, registration cancelled 2013-05-30

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: May 30, 2013
- Status when cancelled: Registration expired, pending cancellation
- Airframe: [Grumman American Avn. AA-1C](https://openairdocs.org/model/grumman-american-avn-aa-1c) (registry code 3960100)
- Engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505)
- Data sheets: [TCDS A11EA](https://openairdocs.org/tcds/A11EA), [TCDS E-223](https://openairdocs.org/tcds/E-223) (OpenAirDocs)
- Serial number: AA1C0158
- Year built: 1978
- Type of aircraft: Fixed wing single engine
- Engine type: 4 cycle
- Airworthiness: Standard, utility
- Airworthiness date: March 30, 1978
- Certificate issued: September 26, 1978
- Last registry action: December 14, 1985
- Mode S code: ADDD08
- Owners when cancelled: [Welt Robert H](https://openairdocs.org/faa-owner/WELT%20ROBERT%20H), [Welt Barbara J](https://openairdocs.org/faa-owner/WELT%20BARBARA%20J)
- Location: [Villa Park, CA](https://openairdocs.org/faa-place/CA/Villa%20Park)
- Owner type: Co-owned
- Owner's area on the map: 33.8182° N, 117.8113° W: Placed by OpenAirDocs: center of Villa Park, CA, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N9924U
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=9924U
- Page: https://openairdocs.org/deregistered/N9924U-2013-05-30

From the FAA registry file of November 5, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe.

ADs and bulletins for the Grumman American Avn. AA-1C: https://openairdocs.org/model/grumman-american-avn-aa-1c.md

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX79FXQ20](https://openairdocs.org/ntsb/LAX79FXQ20), Jun 16, 1979: Grum Amer AA1-C (N9924U), S.Lake Tahoe, CA, substantial damage

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 19790616023149A](https://openairdocs.org/incident/19790616023149A), Jun 16, 1979: Gulstm AA1C (N9924U), South Lake Taho, CA, Substantial damage. Departed into area of high mountains and severe turbulence and downdrafts. Landed on a golf course. Flipped over.

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