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=--=--=START=--=--= NASA Spacelink File Name:6_2_2_46_3_5.TXT
SPACE SHUTTLE ABORT MODES
Space Shuttle launch abort philosophy aims toward safe and
intact recovery of the flight crew, Orbiter and its payload. Abort
modes include:
* Abort-To-Orbit (ATO) -- Partial loss of main engine thrust
late enough to permit reaching a minimal 105-nautical mile orbit
with orbital maneuvering system engines.
* Abort-Once-Around (AOA) -- Earlier main engine shutdown with
the capability to allow one orbit around before landing at Edwards
Air Force Base, Calif.
* Transatlantic Abort Landing (TAL) -- Loss of one or more main
engines midway through powered flight would force a landing at
either Banjul, The Gambia; Ben Guerir, Morocco; or Moron, Spain.
* Return-To-Launch-Site (RTLS) -- Early shutdown of one or more
engines, and without enough energy to reach Banjul, would result in
a pitch around and thrust back toward KSC until within gliding
distance of the Shuttle Landing Facility.
STS-51 contingency landing sites are the Kennedy Space Center,
Edwards Air Force Base, Banjul, Ben Guerir and Moron.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=