Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N99BU.
| Tail Number / N-Number | N99BU |
| Manufacturer | UNDERWOOD WILLIAM B |
| Model | BU-152 |
| Year Built | 2001 |
| Manufacturer's Serial Number | 01 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | ROTORWAY |
| Engine Model | RW152 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 150 hp (112 kW) |
| Type of Registrant | Individual |
| Owner Name | UNDERWOOD WILLIAM B |
| Street | 4380 CLAIRESBROOK LN |
| City | ACWORTH |
| State | GA |
| Zip Code | 30101 |
| Country | US |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2001-05-17 |
| Certificate Issue Date | 2001-03-15 |
| Last Action Date | 2004-04-13 |
| Last Status | Triennial Aircraft Registration form was returned by the Post Office as undeliverable |
| Cancellation Date | 2004-05-19 |
| Mode S Code | 53350166 |
| Mode S Code Hex | ADD076 |