Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4957C.
| Tail Number / N-Number | N4957C |
| Manufacturer | SIKORSKY |
| Model | S-51 |
| Manufacturer's Serial Number | 122709 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | P&W |
| Engine Model | R-985 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 450 hp (336 kW) |
| Average Cruising Speed | 77 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | AMERICAN MATERIAL & EQUIPT CO |
| Street | PO BOX 255 |
| City | TEXARKANA |
| State | TX |
| Zip Code | 75501 |
| Country | US |
| Airworthiness Classification | Standard |
| Last Action Date | 1977-01-14 |
| Last Status | Revoked – Pending Cancellation |
| Cancellation Date | 2011-12-06 |
| Mode S Code | 51422773 |
| Mode S Code Hex | A625FB |