| Tail Number / N-Number | N421QB |
| Manufacturer | CANADIAN CAR & FOUNDRY |
| Model | HARVARD MK IV |
| Year Built | 1952 |
| Manufacturer's Serial Number | CCF-4-212 |
| Aircraft Type | Fixed wing single engine |
| 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 | P&W |
| Engine Model | R1340 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 600 hp (448 kW) |
| Average Cruising Speed | 240 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | AMERICAN AIRPOWER HERITAGE FLYING MUSEUM |
| Street | PO BOX 764769 |
| City | DALLAS |
| State | TX |
| Zip Code | 75376-4769 |
| Region | Southwestern |
| County | Dallas County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2007-08-16 |
| Certificate Issue Date | 2007-06-04 |
| Last Action Date | 2020-02-20 |
| Expiration Date | 2027-07-31 |
| Status | Valid Registration |
| Mode S Code | 51200266 |
| Mode S Code Hex | A500B6 |