Apollo/Skylab spacesuit

Apollo 15 space suit worn by David Scott

The A7L Apollo & Skylab spacesuit is the primary pressure suit worn by NASA astronauts for Project Apollo, the three manned Skylab flights, and the Apollo-Soyuz Test Project between 1968 and the termination of the Apollo program in 1975. The "A7L" designation is used by NASA as the seventh Apollo spacesuit designed and built by ILC Dover, a pressure suit manufacturer located south of Dover, Delaware.

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The basic design of the A7L suit was a one piece, five-layer "torso-limb" suit with convoluted joints made of synthetic rubber at the elbow and knee joints, "link-net" meshing to prevent the suit from ballooning, and a shoulder "cable block" assembly to allow the shoulder to be extended and retracted by its wearer. Metal rings at the neck and forearms allowed for the connection of the pressure gloves and the famous Apollo "fishbowl helmet" (adopted by NASA as it allowed an unrestricted view, as well as eliminating the need for a visor seal required in the Mercury program and Gemini program spacesuit helmets). A "cover layer," which was designed to be fireproof after the Apollo 1 launchpad fire, was attached to the pressure suit assembly with Velcro, and was removable for repairs.

Between the Apollo 7 and Apollo 14 flights as well as the Apollo-Soyuz Test Project flight, the suits worn by the commander and lunar module pilot, the two astronauts who would perform the moonwalks, had suits with six life support connections, placed in two parallel rows at the chest and waist, while the command module pilot had a suit with only three — as he would remain in the spacecraft during the entire mission, and his suit had to only protect him if the spacecraft would depressurize. Another difference, besides the number of connectors, were the number of layers. Lunar crews wore suits with a total of 21 layers, including the five-layer pressure suit assembly, and a three-layer specialized "union suit" with plastic tubing which circulated cooling water to cool the astronaut down, minimizing sweating and fogging of the suit helmet. Command module pilots wore a three-layer cover layer for fire protection and a simpler union suit without the plastic tubing; his cooling coming directly from the flow of oxygen in his suit.

All A7L suits featured a vertical zipper that went from the shoulder assembly of the suit down to the crotch. It too was covered by a flap, with the suits for the commander and lunar module pilots featuring a patch of "Chromel-R" woven steel for abrasion protection from the life support backpack.

A7L-B Spacesuit

For the last three Apollo flights, Apollo 15, Apollo 16, and Apollo 17, as well as all three manned Skylab flights, a new suit was introduced, which was designated by NASA as the "A7L-B." For those flights, the A7L suit underwent modifications that incorporated new waist joints, new entry zippers, which went from the right shoulder, diagonally across the back, and ending at the left waist, along with the life support connectors being arraigned in two sets of three-point triangles, necessary for the new waist joint. The waist joint allowed for comfort on the longer-duration lunar EVAs, as well as to allow the astronauts to sit on the lunar rover.

The A7L-B suit was worn by the commander and lunar module pilot for the last three Apollo flights, while the command module pilot, who would now perform deep-space EVAs on the return trip to Earth, would wear a five-connector version of the A7L suit — the liquid cooling connecter being omitted as the astronaut would be connected to a life support umbilical (an oxygen purge system — OPS, and a "red apple" lanyard would be used in an emergency if the umbilical failed). For Skylab, all three astronauts wore the A7L-B suit, as all three astronauts were required to perform EVAs whenever assigned by Mission Control. A life-support system, worn at the waist, uses an umbilical to facilitate both oxygen and liquid cooling, eliminating the backpack, and was similar in design and function to the backup oxygen control system used by the last four Gemini missions.

As a note, although the suits worn by all three Apollo-Soyuz astronauts were three-connector A7L suits, NASA designated the suits as "A7L-B" suits because of a new cover layer that was used in the flight, as well as being the only Apollo suit to use the "worm" logo familiar with NASA pressure, space, and flight suits in the 1980's.