| Tail Number / N-Number | N631LS |
| Manufacturer | LOCKHEED |
| Model | 18-56 |
| Manufacturer's Serial Number | 2404 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 17 seats |
| Weight Class | CLASS 2 (12,500 - 19,999 pounds gross take off weight) |
| Engine Manufacturer | WRIGHT |
| Engine Model | C9HD SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 1,425 hp (1,063 kW) |
| Total Horsepower | 2,850 hp (2,126 kW) |
| Average Cruising Speed | 184 miles per hour |
| Type of Registrant | Individual |
| Owner Name | HILL LAWRENCE E |
| Street | 3070 LOWER LOST PRAIRIE RD |
| City | MARION |
| State | MT |
| Zip Code | 59925-9706 |
| Region | Northwest Mountain |
| County | Flathead County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1958-08-06 |
| Certificate Issue Date | 2014-05-09 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-05-31 |
| Status | Valid Registration |
| Mode S Code | 52041176 |
| Mode S Code Hex | A8427E |