Environmental exposure.
Intemal power T — 0 PURGE SUBSYSTEM (PREFLIGHT AND POSTFLIGHT) REMOVE CONDENSED WATER Y ci INNER CAVITY VENT OUTLET CANISTER CANISTERS (PLENUM) CHECK VALVE OUTER CAVITY SYSTEM INNER CAVITY SYSTEM INNER CAVITY VENT.
Intemal power T — 0 PURGE SUBSYSTEM (PREFLIGHT AND POSTFLIGHT) REMOVE CONDENSED WATER Y ci INNER CAVITY VENT OUTLET CANISTER CANISTERS (PLENUM) CHECK VALVE OUTER CAVITY SYSTEM INNER CAVITY SYSTEM INNER CAVITY VENT.