| Tail Number / N-Number | N557RM |
| Manufacturer | MOONEY |
| Model | M20R |
| Year Built | 2000 |
| Manufacturer's Serial Number | 29-0210 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | IO-550 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 300 hp (224 kW) |
| Type of Registrant | Corporation |
| Owner Name | WEST STREET PARTNERS LTD |
| Street | PO BOX 98 |
| City | LITCHFIELD |
| State | CT |
| Zip Code | 06759-0098 |
| Region | New England |
| County | Litchfield County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2000-01-11 |
| Certificate Issue Date | 2000-03-07 |
| Last Action Date | 2022-05-12 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 51615357 |
| Mode S Code Hex | A71AEF |