Encyclopedia Astronautica
1971.10.06 - Apollo 15 anomalies

Major items of discussion during the Manned Space Flight Management Council meeting in Washington were the Apollo 15 anomalies.

These included parachute collapse during landing, lunar module descent battery, lunar surface drill, and steering mechanism on the LRV. Also discussed were the Apollo 16 preparations and the feasibility of TV coverage of the lunar rover during traverse.

The most likely cause of the parachute collapse was damage from burning raw RCS fuel (monomethyl hydrazine) being expelled during depletion firing. Corrective action included landing with reaction control system propellants on board for a normal landing and biasing the propellant load to a slight excess of oxidizer and increasing the time delay inhibiting the rapid propellant dump, to avoid fuel contacting the parachute riser and suspension lines during low-altitude-abort land landings.

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