posted 04-19-2024 10:06 PM            

The original plan for this phase was to conduct five flights; however, the program was restructured upon completion of the captive-inert flights. Flight 2 was deleted by adding the test requirements to those of flight 1. A flight was added to precede flight 1 with test conditions below the hardware structural limit speed envelope because of concern that a hardover orbiter control surface was possible. This flight was designated flight 1A. Flights 4 and 5 were to be flown only if there were problems on prior flights that warranted additional flights.