| Tail Number / N-Number | N631SD |
| Manufacturer | EUROCOPTER |
| Model | AS 350 B2 |
| Year Built | 2001 |
| Manufacturer's Serial Number | 3389 |
| Aircraft Type | Rotorcraft |
| 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 | TURBOMECA |
| Engine Model | ARRIEL 1SER |
| Engine Type | Turbo-shaft |
| Number of Engines | 1 engine |
| Horsepower | 681 hp (508 kW) |
| Type of Registrant | Government |
| Owner Name | COUNTY OF OAKLAND |
| Street | 1200 N TELEGRAPH |
| City | PONTIAC |
| State | MI |
| Zip Code | 48341 |
| Region | Great Lakes |
| County | Oakland County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2001-06-01 |
| Certificate Issue Date | 2001-10-19 |
| Last Action Date | 2021-02-19 |
| Expiration Date | 2028-07-31 |
| Status | Valid Registration |
| Mode S Code | 52041407 |
| Mode S Code Hex | A84307 |