In waves.

Select latch group opening or closing sequences. AFT BULKHEAD ГА Be 43 = PAYLOAD BAY VENT FILTER — ELECTROMAGNETIC INTERFERENCE SHIELD SPECIAL OUTLETS TYPICAL MID-FUSELAGE FOR PAYLOAD (3) VENT SUBSYSTEM (ALL PHASES) VENTS - IN WITH REENTRY DRAIN (PREFLIGHT AND POSTFLIGHT) REMOVE CONDENSED WATER Y.