| Tail Number / N-Number | N421SM |
| Manufacturer | CESSNA |
| Model | 421C |
| Manufacturer's Serial Number | 421C1213 |
| 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 | GTSIO-520 SER |
| Engine Type | Turbo-prop |
| Number of Engines | 2 engines |
| Horsepower per Engine | 435 hp (325 kW) |
| Total Horsepower | 870 hp (649 kW) |
| Average Cruising Speed | 90 miles per hour |
| Type of Registrant | LLC |
| Owner Name | SPRUCE HILL LEASING LLC |
| Street | 239 RUSSELL ST |
| City | HADLEY |
| State | MA |
| Zip Code | 01035-9558 |
| Region | New England |
| County | Hampshire County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2004-01-09 |
| Certificate Issue Date | 2021-09-21 |
| Last Action Date | 2021-09-21 |
| Expiration Date | 2028-09-30 |
| Status | Valid Registration |
| Mode S Code | 51200362 |
| Mode S Code Hex | A500F2 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N421SM.
| Tail Number / N-Number | N421SM |
| Manufacturer | CESSNA |
| Model | 421B |
| Year Built | 1975 |
| Manufacturer's Serial Number | 421B0889 |
| 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 | GTSIO-520-C |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 340 hp (254 kW) |
| Total Horsepower | 680 hp (507 kW) |
| Average Cruising Speed | 172 miles per hour |
| Type of Registrant | Individual |
| Owner Name | SALE REPORTED |
| Street | 1146 UNIFORM RD |
| City | GRIFFIN |
| State | GA |
| Zip Code | 30224-4765 |
| County | Hampshire County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1975-04-01 |
| Last Action Date | 2009-10-08 |
| Last Status | Sale reported |
| Cancellation Date | 2009-10-28 |