| Tail Number / N-Number | N21958 |
| Manufacturer | CESSNA |
| Model | A185F |
| Year Built | 1976 |
| Manufacturer's Serial Number | 18503072 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 6 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | IO 520 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 285 hp (213 kW) |
| Average Cruising Speed | 127 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | HILLSBORO AERO LTD |
| Street | PO BOX 472 |
| City | HILLSBORO |
| State | ND |
| Zip Code | 58045-0472 |
| Region | Great Lakes |
| County | Traill County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1976-06-29 |
| Certificate Issue Date | 2013-12-10 |
| Last Action Date | 2022-07-13 |
| Expiration Date | 2029-12-31 |
| Status | Valid Registration |
| Mode S Code | 50357031 |
| Mode S Code Hex | A1DE19 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N21958.
| Tail Number / N-Number | N21958 |
| Manufacturer | GOERTZ MACHINE SHOP |
| Model | PIETENPOL |
| Year Built | 1939 |
| Manufacturer's Serial Number | 1 |
| 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) |
| Number of Engines | 1 engine |
| Type of Registrant | Partnership |
| Owner Name | DAVID ANDREW C |
| Street | GENERAL DELIVERY |
| City | DURHAM |
| State | KS |
| Zip Code | 67438 |
| Region | Central |
| County | Traill County |
| Certificate Issue Date | 1938-08-26 |
| Last Status | Valid Registration |
| Cancellation Date | 1940-02-01 |