| Tail Number / N-Number | N4004K |
| Manufacturer | AYRES CORPORATION |
| Model | S2R-600 |
| Year Built | 1978 |
| Manufacturer's Serial Number | 2488R |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | AIRESEARCH |
| Engine Model | TPE331 SERIES |
| Engine Type | Turbo-prop |
| Number of Engines | 1 engine |
| Horsepower | 600 hp (448 kW) |
| Type of Registrant | LLC |
| Owner Name | HERITAGE AG LLC |
| Street | 2197 STRAIT TOW BLVD |
| City | CRYSTAL |
| State | MI |
| Zip Code | 48818-9618 |
| Region | Great Lakes |
| County | Montcalm County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Restricted |
| Airworthiness Date | 1979-03-09 |
| Certificate Issue Date | 2021-10-14 |
| Last Action Date | 2021-10-14 |
| Expiration Date | 2028-10-31 |
| Status | Valid Registration |
| Mode S Code | 51127617 |
| Mode S Code Hex | A4AF8F |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4004K.
| Tail Number / N-Number | N4004K |
| Manufacturer | NORTH AMERICAN |
| Model | NAVION |
| Manufacturer's Serial Number | NAV-4-1004 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 5 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 126 miles per hour |
| Type of Registrant | Individual |
| Owner Name | WILLFORD DONALD R |
| Street | 1469 MORENO |
| City | OCEANSIDE |
| State | CA |
| Zip Code | 92054 |
| Region | Western-Pacific |
| County | Montcalm County |
| Certificate Issue Date | 1966-05-26 |
| Last Status | Valid Registration |
| Cancellation Date | 1973-05-21 |
| Exported To | CANADA |