Citron 1 quart.
(aft) Multiplexer-demultiplexer units FORWARD AVIONICS BAYS (4, 5, AND 6) FUEL FUEL SERVICING - ISOLATION RECEPTACLES VALVES (2) AND FILTER (1) | 7 / & SS асе APU SYSTEM 3 3) APU ES SEAL CAVITY ! DRAIN APU 2 AS DÍ eS A | FUEL LINE | < APU 1 9 Y OlL COOLING | | “4 Space Shuttle.