In flight. The first six ever seen.

MA ; > | /% WI \ HATCH 77 бо е DRAIN PORTS 4-34 Purge, Vent, and Drain System .......... 4-33 AVIONICS .............................. 4-37 5 ORBITER CREW Orbiter, the “Enterprise,” a flight-type External Tank ......................... 2-33 3 ORBITER STRUCTURE The Orbiter.