| Tail Number / N-Number | N28921 |
| Manufacturer | ENGINEERING & RESEARCH |
| Model | 415-C |
| Year Built | 1940 |
| Manufacturer's Serial Number | 16 |
| 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 | 90 miles per hour |
| Type of Registrant | Individual |
| Owner Name | NORBERG JOHN |
| Street | 2245 REDWOOD ST |
| City | EUREKA |
| State | CA |
| Zip Code | 95503-6260 |
| Region | Western-Pacific |
| County | Humboldt County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1955-12-20 |
| Certificate Issue Date | 2007-03-08 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-02-28 |
| Status | Valid Registration |
| Mode S Code | 50571042 |
| Mode S Code Hex | A2F222 |