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| Space Shuttle Approach and Landing Tests | |
|---|---|
| Name | Enterprise (OV-101) |
| Caption | Enterprise during an Approach and Landing Test |
| Mission type | Atmospheric test program |
| Operator | National Aeronautics and Space Administration (NASA) |
| Manufacturer | Rockwell International; originally North American Rockwell |
| Launch mass | Prototype weight (no orbital engines) |
| First flight | 1977 (Approach and Landing Tests) |
| Last flight | 1977 (ALT free flights) |
| Status | Retired; displayed at Intrepid Sea, Air & Space Museum |
Space Shuttle Approach and Landing Tests
The Space Shuttle Approach and Landing Tests were a 1977 series of atmospheric flight evaluations of the prototype orbiter Enterprise (OV-101) conducted by NASA with partners at Rockwell International and the Northrop Corporation range support teams. The program validated aerodynamics, handling qualities, and piloting techniques for the Space Shuttle orbiter configuration prior to the first orbital missions of Columbia (OV-102) and training for crews drawn from NASA Astronaut Corps, including pilots with backgrounds from United States Air Force test programs and Naval Air Test Center operations. The tests combined captive-carry, taxi, and unpowered free-flight landings flown from a Shuttle Carrier Aircraft derived from the Boeing 747.
The ALT program grew from requirements set by NASA Langley Research Center, NASA Ames Research Center, and the Marshall Space Flight Center to verify orbiter low-speed characteristics and landing techniques developed during wind tunnel work at Langley and computational studies by Douglas Aircraft Company legacy teams. Objectives included confirming glide angle, sink rate, control response, and runway requirements at facilities like Edwards Air Force Base and Dryden Flight Research Center (later Armstrong Flight Research Center). Goals also aligned with mission assurance practices used by Johnson Space Center flight crews and safety directives from the Federal Aviation Administration where applicable to ferry operations.
Planning involved coordination among Rockwell International engineers, NASA Flight Research Center test pilots, Boeing engineers responsible for the Shuttle Carrier Aircraft, and logistics teams at Palmdale Plant 42 for orbiter mating. Ground handling, tow, and runway procedures were rehearsed with representatives from Edwards Air Force Base Fire Department, Air Force Flight Test Center, and NASA Flight Operations Directorate. Airworthiness and instrumentation requirements referenced certification practices from United States Air Force Test Pilot School and regulatory precedents set by Federal Aviation Administration liaison officers.
The sequence began with captive-carry flights where Enterprise remained attached to the Shuttle Carrier Aircraft, transitioning to captive-release and then to unpowered free glides. Pilots including Fred Haise and Gordon Fullerton conducted taxi and glide tests, practicing flare, touchdown, and roll-out on runways used for Space Shuttle operations. Free-flight approaches demonstrated approach profiles, final approach speeds, and energy management similar to procedures adopted by crews at Kennedy Space Center for orbiter landings and underscored crosswind and crossrange handling tested near Edwards Air Force Base.
Enterprise lacked orbital systems such as main engines and thermal protection tiles used on Columbia but was equipped with aerodynamic surfaces, flight control actuators, and landing gear representative of production orbiters. Instrumentation suites integrated sensors supplied by Rockwell International, avionics interfaces developed with input from IBM subcontractors, and telemetry systems compatible with NASA Dryden ground stations. Structural modifications for captive carry and separation included attachment hardware validated by teams from Boeing and inspected under directives from Ames Research Center engineers.
Test procedures specified release parameters, approach waypoints, and abort contingencies coordinated with Air Traffic Control elements at Edwards Air Force Base and Palmdale. Data collection employed onboard accelerometers, angle-of-attack sensors, and air data probes whose outputs were logged alongside visual observations by pilots from Johnson Space Center training squadrons. Ground-based telemetry links relayed real-time flight metrics to analysts at Dryden Flight Research Center, Langley, and systems engineers at Rockwell International for post-flight reduction.
ALT validated orbiter handling qualities, establishing target approach speeds, sink rates, and flare techniques later codified in Shuttle pilot training at Johnson Space Center simulators. Data led to refinement of flight control law tuning performed by Rockwell and influenced hardware adjustments for Columbia and subsequent orbiters, affecting landing gear dynamics studied by Air Force Flight Test Center engineers. The program reduced risk for runway operations at Kennedy Space Center and contributed to contingency landing assessments at alternate sites including White Sands Test Facility.
Approach and Landing Tests provided empirical foundations for operational procedures, pilot training curricula, and design modifications implemented across the Space Shuttle fleet, informing decisions made by program offices at NASA Headquarters and flight directors at Mission Control Center. Enterprise became an educational and museum artifact displayed at institutions such as the Smithsonian National Air and Space Museum and the Intrepid Sea, Air & Space Museum, preserving public awareness of early Shuttle flight testing. The ALT program established precedents used by later aerospace test initiatives involving prototype validation at Edwards Air Force Base and influenced cooperative test planning between NASA and aerospace contractors for future crewed programs.
Category:Space Shuttle Category:NASA flight tests