Ahrens Aircraft Corp AR-404

Ahrens developed AR 404 twin-turboprop 30-passenger or cargo transport, intended to be simple to maintain and having a constant square-section fuselage to provide maximum volume.

Designed by Peter Ahrens in California for production in Puerto Rico

The prototype first flew in December 1976, followed by the first production-standard aircraft built in Puerto Rico in October 1979, but program halted through lack of funding.

The Ahrens 404 is designed for simple manufacture, harsh conditions, easy repair, the four-turboprop utiliplane featured an aft-loading-ramp.