|Ascent Abort Modes
If a malfunction forces an ascent abort, several options are available.
Designed to allow return of orbiter and crew to KSC launch site.
Available if a main engine fails after last RTLS opportunity, but
before AOA can be accomplished.
Used to boost the orbiter to a safe orbital altitude if it is impossible
to reach the planned altitude.
Vehicle orbits the Earth once and lands at Edwards AFB or KSC.
Maintains orbiter integrity for in-flight crew escape if landing
cannot be made.