| Tail Number / N-Number | N421HM |
| Manufacturer | CESSNA |
| Model | 421B |
| Year Built | 1970 |
| Manufacturer's Serial Number | 421B0029 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | GTSI0-520-F-K |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 435 hp (325 kW) |
| Total Horsepower | 870 hp (649 kW) |
| Average Cruising Speed | 172 miles per hour |
| Type of Registrant | LLC |
| Owner Name | WASHINGTON COUNTY FINANCIAL MANAGEMENT CO LLC |
| Street | 1845 SHELBY LN |
| City | FAYETTEVILLE |
| State | AR |
| Zip Code | 72704-5265 |
| Region | Southwestern |
| County | Washington County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1991-04-26 |
| Certificate Issue Date | 2006-10-12 |
| Last Action Date | 2021-05-20 |
| Expiration Date | 2028-07-31 |
| Status | Valid Registration |
| Mode S Code | 51200021 |
| Mode S Code Hex | A50011 |