Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N53991.
| Tail Number / N-Number | N53991 |
| Manufacturer | HILLER |
| Model | UH-12B |
| Year Built | 1954 |
| Manufacturer's Serial Number | 643 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | FRANKLIN |
| Engine Model | 6VS-335 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 240 hp (179 kW) |
| Average Cruising Speed | 63 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | UPPER LIMITS SALES & LEASING INC |
| Street | 152 ANTON CT |
| City | EUGENE |
| State | OR |
| Zip Code | 97402-6525 |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1974-12-23 |
| Certificate Issue Date | 2001-08-28 |
| Last Action Date | 2001-08-28 |
| Last Status | Valid Registration |
| Cancellation Date | 2003-08-05 |
| Exported To | CHINA PEOPLES REP |
| Mode S Code | 51552611 |
| Mode S Code Hex | A6D589 |