| Tail Number / N-Number | N557W |
| Manufacturer | MONOCOUPE |
| Model | 90 |
| Year Built | 1931 |
| Manufacturer's Serial Number | 575 |
| 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 | LAMBERT |
| Engine Model | R266 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 90 hp (67 kW) |
| Average Cruising Speed | 72 miles per hour |
| Type of Registrant | Co-Ownership |
| Owner Name | BOWE WALTER C TRUSTEE |
| Other Names |
|
| Street | 19500 7TH ST E |
| City | SONOMA |
| State | CA |
| Zip Code | 95476-7201 |
| Region | Western-Pacific |
| County | Sonoma County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1974-08-01 |
| Certificate Issue Date | 2020-05-14 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-05-31 |
| Status | Valid Registration |
| Mode S Code | 51615540 |
| Mode S Code Hex | A71B60 |