Terms & Abbreviations: A

AAP

Apollo Applications Program.

AC

See AC Sparkplug

AC Sparkplug

AC Sparkplug was the principal contractor for the construction of Apollo guidance systems.

AGS

Abort Guidance System.

AOT

Alignment Optical Telescope, a "space sextant" the astronauts used to correct the alignment of their intertial guidance system.

Apollo 1

Originally designated AS-204, Apollo 1 was scheduled to be to launch on February 21, 1967 as the first manned Apollo mission. During a test on January 27, 1967, a fire in the crew compartment killed the three Apollo 1 austronauts, Gus Grissom, Ed White, and Roger Chaffee. This fire resulted in reappraisal of just about every goal, procedure, and schedule of the Apollo program.

APS

Ascent Propulsion System

AS-204

See Apollo 1

AS-206

Originally scheduled as the first unmanned flight of the LM, it was cancelled after the Apollo 1 fire. The AS-206 launch vehicle, a Saturn 1B, was used to launch Skylab 2 on May 25, 1973.

AS-207/208

AS-207/208 (also known as AS-278) was to have been the first test of the LM in Earth orbit. It was also to have be a dual mission with the command and lunar modules launched on separate Saturn 1Bs. The mission was cancelled after the Apollo 1 fire and the Saturn 1Bs were used to launch Skylab 3 (AS-207) on July 28, 1973 and Skylab 4 (AS-208) on November 16, 1978. The LM was first tested by Apollo 5 in January 1968.

AS-208

See AS-207/208

AS-278

See AS-207/208

AS-278B

See AS-207/208

AS-503

Before the Apollo 1 fire, the mission referred to as AS-503 was an unmanned Earth orbit test flight of the LM and CM scheduled for October 1967. The launch vehicle, SA-503 was used for Apollo 8, December 23 1968.

AS-504

Before the Apollo 1 fire, the mission referred to as AS-504 was originally scheduled for December 1967. AS-504 eventually launched as Apollo 9, March 3 1969.

ASPO

Apollo Spacecraft Program Office.