Lunar Module Restraint Equipment

Of course, the Apollo Lunar Module had no seats due to weight constraints. However, the crew couldn't just be floating around during flight operations in zero-g; some sort of restraint system was necessary.

To quote from the Apollo Operations Handbook: Lunar Module LM-6 and Subsequent: Volume 1: Subsystems Data (LMA790-3-LM 6) [direct link to 187 meg PDF] available from the USSRC archive at the University of Alabama, Huntsville:

The restraint assembly consists of ropes, restraint rings, and a constant-force reel system. The ropes attach to D-rings on the PGA sides, waist high. The constant-force reel control provides a downward force of approximately 30 pounds; it is locked during landing or docking operations. When the constant-force reel is locked, the ropes are free to reel in. A ratchet stop prevents paying out of the ropes and thus provides zero-g restraint. During docking maneuvers, the Commander uses pin adjustments to enable him to use the crewman optical alignment sight (COAS) at the overhead (docking) window.

Apollo lunar module lm astronaut restraing system equipment

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From p. 2.11-20 (p 742 in the PDF) of Apollo Operations Handbook: Lunar Module LM-6 and Subsequent: Volume 1: Subsystems Data (LMA790-3-LM 6) [direct link to 187 meg PDF] available from the USSRC archive at the University of Alabama, Huntsville
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