Astronauts Engle and Truly in cockpit of Orbiter 101 prior to takeoff

S77-28212 (13 Sept 1977) --- Astronauts Joe H. Engle (right), commander, and Richard H. Truly, pilot, sit in the cockpit of the shuttle Orbiter 101 "Enterprise" at the Dryden Flight Research Center (DFRC) prior to takeoff of the NASA 747 carrier aircraft to which the "Enterprise" was mated. The pair later made a five-minute, 31-second free-flight in the craft, the second in a series of such flights for the Shuttle Approach and Landing Tests (ALT) program. The photograph was made from the Mate-Demate Device (MDD).