| Tail Number / N-Number | N421MZ |
| Manufacturer | CESSNA |
| Model | 421B |
| Year Built | 1970 |
| Manufacturer's Serial Number | 421B0049 |
| 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 | TSIO-520 SER |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 300 hp (224 kW) |
| Total Horsepower | 600 hp (448 kW) |
| Average Cruising Speed | 172 miles per hour |
| Type of Registrant | Individual |
| Owner Name | YEAGER FRED M |
| Street | 37 SAN CARLOS DR |
| City | SAINT CHARLES |
| State | MO |
| Zip Code | 63303-4117 |
| Region | Central |
| County | St. Charles County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1970-10-12 |
| Certificate Issue Date | 2019-08-14 |
| Last Action Date | 2022-03-09 |
| Expiration Date | 2029-08-31 |
| Status | Valid Registration |
| Mode S Code | 51200201 |
| Mode S Code Hex | A50081 |