| Tail Number / N-Number | N37991 |
| Manufacturer | PIPER |
| Model | J4E |
| Year Built | 1941 |
| Manufacturer's Serial Number | 4-1485 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | C85 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 85 hp (63 kW) |
| Average Cruising Speed | 75 miles per hour |
| Type of Registrant | Individual |
| Owner Name | BAYNE CLYDE O |
| Street | 36 CHEYENNE RIVER RD |
| City | NEWCASTLE |
| State | WY |
| Zip Code | 82701-9556 |
| Region | Northwest Mountain |
| County | Weston County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Certificate Issue Date | 2015-07-09 |
| Last Action Date | 2021-03-10 |
| Expiration Date | 2028-07-31 |
| Status | Valid Registration |
| Mode S Code | 51054347 |
| Mode S Code Hex | A458E7 |