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MANEUVERING REACTION SYSTEM CONTROL ENGINE ALUMINUM HOUSING THRUST AFT TANK ALUMINUM “22 Ж en SUPPORT BULKHEAD FRAME (TITANIUM WEB) GRAPHITE/EPOXY “J” MEMBER FORWARD UPPER CAP ALUMINUM CENTERLINE BEAM ALUMINUM REACTION CONTROL SYSTEM TANK SUPPORT INTERCOSTAL Figure 3-16.—Aft propulsion system components. The IMU's provide attitude and velocity.