# N9S: Busch Doug EXEC 90

- Status: Valid registration
- Airframe: [Busch Doug EXEC 90](https://openairdocs.org/model/busch-doug-exec-90) (registry code 05626Q4, 2 seats)
- Engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999)
- Serial number: EXP 1
- Type: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: December 10, 1996
- Certificate issued: July 13, 2023
- Expires: July 31, 2030
- Mode S code: AC6C0A
- Registered owner: [Busch Doug W](https://openairdocs.org/faa-owner/BUSCH%20DOUG%20W)
- Location: [Saint Paul, MN](https://openairdocs.org/faa-place/MN/Saint%20Paul)
- Owner type: Individual
- Owner's area on the map: 45.0830° N, 93.1405° W: Placed by OpenAirDocs at the center of ZIP code 55126, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=9S
- Page: https://openairdocs.org/aircraft/N9S

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.

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

### Matched by airframe (Busch Doug EXEC 90)

None in force.

### Matched by engine (Amateur-built UNKNOWN ENG)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N9S.

## FAA accident and incident reports

None matched to N9S.

## 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.

## Earlier aircraft with N9S

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N9S before.

- [Cancelled 1993-01-29](https://openairdocs.org/deregistered/N9S-1993-01-29): Sherrill PITTS SPECIAL S-1, S/N 362H. Exported to United Kingdom. Owner: [None, OK](https://openairdocs.org/faa-place/OK/None)

## Related

- Other Busch Doug EXEC 90 aircraft: https://openairdocs.org/model/busch-doug-exec-90/aircraft.md
- The Amateur-built UNKNOWN ENG engine: https://openairdocs.org/engine/amateur-built-unknown-eng.md

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