# N4001A: 1956 Beech AT-11

- Status: Valid registration
- Airframe: [Beech AT-11](https://openairdocs.org/model/beech-at-11) (registry code 1150202, 4 seats)
- Engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008)
- Serial number: 43-10384
- Year built: 1956
- Type: Fixed wing multi engine
- Engine type: Reciprocating
- Airworthiness: Restricted, agriculture and pest control
- Certificate issued: February 4, 1987
- Expires: September 30, 2029
- Mode S code: A4AF1D
- Registered owner: [Allen Chorman & Son Inc](https://openairdocs.org/faa-owner/ALLEN%20CHORMAN%20%26%20SON%20INC)
- Location: [Milton, DE](https://openairdocs.org/faa-place/DE/Milton)
- Owner type: Corporation
- Owner's area on the map: 38.7829° N, 75.2798° W: Placed by OpenAirDocs at the center of ZIP code 19968, within about 5 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4001A
- Page: https://openairdocs.org/aircraft/N4001A

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Pratt & Whitney R-985 model are included.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (Beech AT-11)

None in force.

### Matched by engine (Pratt & Whitney R-985 series)

None in force.

## Information bulletins (advisory)

None matched.

## 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 NYC67F0041](https://openairdocs.org/ntsb/NYC67F0041), May 31, 1966: Beech AT11 (N4001A), Milford, DE, substantial damage

## FAA accident and incident reports

None matched to N4001A.

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Related

- Other Beech AT-11 aircraft: https://openairdocs.org/model/beech-at-11/aircraft.md
- The Pratt & Whitney R-985 series engine: https://openairdocs.org/engine/pratt-whitney-r-985-series.md

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