The "Credible Sport" phase I program was initiated by the OSD directorate and was designed to validate S.T.O.L. approach configuration and associated avionics. Hercules 74-1683 was modified so it could take off and land almost like a helicopter. The aircraft was equipped with lift rockets slanting downward, slowdown rockets facing forward. The aircraft was intended for use in Iran to rescue American hostages. During a STOL demonstration flight the pilot fired the upper set of slowdown rockets at a height of 40 feet, instead of 20 feet at usual. The navigator was trained to fire the lower slowdown rockets three seconds later, just after touchdown.
Tehran, Oct 18th 2011. This Iran Air Boeing 727 had a crash landing due to nose gear stucked in upright position. The airliner was on duty from Moscow to Tehran and the flight crew manage a perfect belly landing with minimum damage with great skills of flight.