Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N531S.
| Tail Number / N-Number | N531S |
| Manufacturer | CLEVENGER |
| Model | CASSUTT M III |
| Year Built | 1969 |
| Manufacturer's Serial Number | ES-001 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | 0-200 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 100 hp (75 kW) |
| Average Cruising Speed | 112 miles per hour |
| Type of Registrant | Individual |
| Owner Name | HAAS KENNETH P |
| Street | 2038 CALLE YUCCA |
| City | THOUSAND OAKS |
| State | CA |
| Zip Code | 91360 |
| Country | US |
| Airworthiness Classification | Experimental |
| Certificate Issue Date | 1970-04-23 |
| Last Action Date | 1977-04-16 |
| Last Status | Revoked – Canceled |
| Cancellation Date | 2012-09-18 |
| Mode S Code | 51532664 |
| Mode S Code Hex | A6B5B4 |