| Tail Number / N-Number | N3921A |
| Manufacturer | PIPER |
| Model | J3C-65 |
| Year Built | 1943 |
| Manufacturer's Serial Number | 9391 |
| 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 | A&C65 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 65 hp (48 kW) |
| Average Cruising Speed | 67 miles per hour |
| Type of Registrant | Individual |
| Owner Name | WEIR FREDERICK C |
| Street | 73 FICKETT RD |
| City | POWNAL |
| State | ME |
| Zip Code | 04069-6154 |
| Region | New England |
| County | Cumberland County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1956-05-18 |
| Certificate Issue Date | 1990-01-25 |
| Last Action Date | 2022-10-24 |
| Expiration Date | 2029-11-30 |
| Status | Valid Registration |
| Mode S Code | 51106263 |
| Mode S Code Hex | A48CB3 |