- #The space shuttle flight control system called pass series
- #The space shuttle flight control system called pass free
The Enterprise had no propulsion system, but its first four glides to the Rogers Dry Lake runway provided realistic, in-flight simulations of how subsequent Space Shuttles would be flown at the end of an orbital mission. The vehicle was released at altitudes ranging from 19,000 to 26,000 feet. For these landings, the Enterprise was flown by a crew of two after it was released from the top of the SCA. The free-flight phase of the ALT program allowed pilots and engineers to learn how the Space Shuttle handled in low-speed flight and landing attitudes. Only three such flights proved necessary.
#The space shuttle flight control system called pass series
The next series of captive flights was flown with a flight crew of two on board the prototype Space Shuttle. Five "captive-inactive" flights were flown during this first phase in which there was no crew in the Enterprise. These flights were to determine how well the two vehicles flew together.
![the space shuttle flight control system called pass the space shuttle flight control system called pass](https://petrofilm.com/yahoo_site_admin/assets/images/war_game_001B.356212454_std.jpg)
The first flight of the program consisted of the Space Shuttle Enterprise attached to the Shuttle Carrier Aircraft. The Enterprise, a prototype of the Space Shuttles, and the SCA were flown to conduct the approach and landing tests at the NASA Dryden Flight Research Center, Edwards, California, from February to October 1977. The Space Shuttle Approach and Landing Tests (ALT) program allowed pilots and engineers to learn how the Space Shuttle and the modified Boeing 747 Shuttle Carrier Aircraft (SCA) handled during low-speed flight and landing.
![the space shuttle flight control system called pass the space shuttle flight control system called pass](https://www.nasa.gov/images/content/555935main_Landing.jpg)
#The space shuttle flight control system called pass free
A series of test flights during which Enterprise was taken aloft atop the SCA, but was not released, preceded the free flight tests. It was removed on the two last free flights to accurately check approach and landing characteristics. A tail cone over the main engine area of Enterprise smoothed out turbulent air flow during flight. The tests were conducted to verify orbiter aerodynamics and handling characteristics in preparation for orbital flights with the Space Shuttle Columbia beginning in April 1981. The Space Shuttle prototype Enterprise flies free after being released from NASA's 747 Shuttle Carrier Aircraft (SCA) over Rogers Dry Lakebed during the second of five free flights carried out at the Dryden Flight Research Center, Edwards, California, as part of the Shuttle program's Approach and Landing Tests (ALT).