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Light than as a backup for the valve. -———————————————————————————————————————————————————————————— і ORIGINAL PAGE IS 2-13 OF POOR QUALITY Thermal Protection .................... 4-25 Purge, Vent, and Drain System PRECEDING PAGE BLANK NOT FILMED 4 з I E ыс E E еніне Briefly... The Orbiter's purge, vent, and drain system on the crew monitoring, supervising, and backing up the mouth with a fluted round cutter to.