UAL CAUTION:_______REMOVE THE MASK STOWAGE BOX SLOWLY UNTIL THE OXYGEN HOSE UAL CAN BE DISCONNECTED. DAMAGE TO THE HOSE MAY HAPPEN IF THE UAL HOSE IS PULLED TIGHT AND NOT DISCONNECTED FROM THE STOWAGE UAL BOX. UAL
(b) Disconnect the oxygen supply line from the stowage box.
1) Slowly loosen the fitting connections with two wrenches: one to hold the fitting and one to tighten the other fitting.
BB TMA 2381/K/1951H
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A
747-400 MAINTENANCE MANUAL
S 034-005
(8) Disconnect these microphone connectors from the stowage box:
(a)
Electrical connector (DB637) on the stowage box (B637) for the captain
(b)
Electrical connector (DB641) on the stowage box (B641) for the first officer.
(c)
Electrical connector (DB643) on the stowage box (B643) for the first observer.
(d)
Electrical connector (DB815) on the stowage box (B815) for the second observer (if installed).
S 034-006
(9) Install clean caps or plugs to the open fittings and ports.
NOTE: Clean metal caps must be used where the cap engages the
____ connector threads. New plastic caps must be used if the cap does not engage the connector threads.
TASK 35-11-18-404-007
3. Stowage Box Installation (Fig. 401)
________________________
A. References
(1)
AMM 35-00-00/201, Oxygen
(2)
AMM 35-11-00/501, Crew Oxygen System
(3)
IPC 35-11-18
(4) WDM 35-11-01 UAL (5) AD 92-02-06, Airworthiness Directive
B. Access
(1) Location Zone
221 Control Cabin Left
222 Control Cabin Right
C. Procedure
S 914-070
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
(2)
Remove all caps or plugs from the fittings and ports.
S 434-009
(3)
Connect these microphone connectors to the stowage box:
S 434-008
(a) Electrical connector (DB637) on the stowage box (B637) for the captain
BB TMA 15760/ST/1951H
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747-400
MAINTENANCE MANUAL
(b) Electrical connector (DB641) on the stowage box (B641) for the first officer.
(c) Electrical connector (DB643) on the stowage box (B643) for the first observer.
(d) Electrical connector (DB815) on the stowage box (B815) for the second observer (if installed).
S 424-010
(4) Install the stowage box. (a) Connect the oxygen supply line to the stowage box as follows: 1) Loosely tighten the fitting connection with your hand. Use two wrenches to tighten the fitting fully; one to hold the fitting and one to tighten the fitting. 2) Do the tasks: "Crew Oxygen Leak Test" (AMM 35-11-00/501) to test the connections for leaks.
(b) (c) Put the stowage box in the structure.Install the stowage box to the structure with the four fasteners.
S 414-011
(5) If not installed before, install the mask/regulator in the stowage box, do this task, "Mask/Regulator Installation".
S 714-076
(6) Move the dilution control on the regulator to N (normal).
S 864-065
WARNING:_______OPEN THE SHUTOFF VALVE ON A CREW OXYGEN CYLINDER SLOWLY. THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(7) Open the shutoff valve on each applicable oxygen cylinder as follows:
NOTE: Some airplanes have an optional second oxygen cylinder.
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