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747-400 MAINTENANCE MANUAL
(b)
Close the shutoff valve one-fourth of a turn.
(c)
Install a lockwire on the shutoff valve.
NOTE: Use the 0.020 inch diameter copper lockwire
____
(AMM 20-11-28/401).
S 864-015
(8) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P7 Overhead Circuit Breaker Panel
1) 7A20 CAPT INTERPHONE
2) 7A21 OBS INTERPHONE
3) 7A22 F/O INTERPHONE
S 714-016
(9) Do the tasks: "Crew Oxygen Operational Test" (AMM 35-11-00/501).
TASK 35-11-18-004-017
4. Mask/Regulator Removal
______________________
A. References
(1)
AMM 35-00-00/201, Oxygen
(2)
IPC 35-11-18
(3)
WDM 23-51-11, 23-51-12, 23-51-13, 23-51-14
B. Access
(1) Location Zone
221 Control Cabin Left
222 Control Cabin Right
C. Procedure
S 914-073
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 864-018
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7A20 CAPT INTERPHONE
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2) 7A21 OBS INTERPHONE 3) 7A22 F/O INTERPHONE S 864-045 CAUTION: DO NOT TORQUE THE SHUTOFF VALVE ON A CREW OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(3) Close the shutoff valve on each applicable cylinder slowly. NOTE: Some airplanes have an optional second oxygen cylinder.
____
NOTE: The shutoff valve can be tightened by hand which is
____
equivalent to 25 pound-inches.
S 714-078
(4)
Set the dilution control lever on the regulator to 100 %. S 034-057
(5)
Set the PRESS TO TEST knob to EMERGENCY. S 034-059
(6)
Move the PRESS TO TEST AND RETEST lever on the mask stowage box to bleed the oxygen lines.
S 034-021
(7)
Disconnect the microphone connector from the stowage box. S 024-022
(8)
Remove the mask/regulator from the stowage box. S 034-023
(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.
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747-400 MAINTENANCE MANUAL
TASK 35-11-18-404-024
5. Mask/Regulator Installation___________________________
A. References
(1)
AMM 35-00-00/201, Oxygen
(2)
35-11-00/501, Crew Oxygen System
(3)
35-11-18/201, Mask, Demand Regulator and Stowage Box
(4)
IPC 35-11-18
(5)
WDM 23-51-11, 23-51-12, 23-51-13, 23-51-14
B. Access
(1) Location Zone
221 Control Cabin Left
222 Control Cabin Right
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