# N99BU: 2001 Underwood William B BU-152, registration cancelled 2004-05-19

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: May 19, 2004
- Status when cancelled: Triennial form undeliverable
- Airframe: [Underwood William B BU-152](https://openairdocs.org/model/underwood-william-b-bu-152) (registry code 05611ID)
- Engine: [Rotorway RW152](https://openairdocs.org/engine/rotorway-rw152) (registry code 55006)
- Serial number: 01
- Year built: 2001
- Type of aircraft: Rotorcraft
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: May 17, 2001
- Certificate issued: March 15, 2001
- Last registry action: April 13, 2004
- Mode S code: ADD076
- Owner when cancelled: [Underwood William B](https://openairdocs.org/faa-owner/UNDERWOOD%20WILLIAM%20B)
- Location: [Acworth, GA](https://openairdocs.org/faa-place/GA/Acworth)
- Owner type: Individual
- Owner's area on the map: 34.0345° N, 84.7073° W: Placed by OpenAirDocs at the center of ZIP code 30101, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N99BU
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=99BU
- Page: https://openairdocs.org/deregistered/N99BU-2004-05-19

From the FAA registry file of October 29, 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 Underwood William B BU-152: https://openairdocs.org/model/underwood-william-b-bu-152.md

## 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.

- [Incident 20010603013199I](https://openairdocs.org/incident/20010603013199I), Jun 3, 2001: Amtr BU152 (N99BU), Marietta, GA, Destroyed. (-23)PIC had performed about four hours of ground and hover flight testing on the helicopter. During the last check after hoving for about five minutes, an…

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