S 714-037
(7)
Do the operational test of the Crew Oxygen System
(AMM 35-12-00/501).
TASK 35-12-86-004-038
6. Mask Demand Regulator Removal
_____________________________
A. General
(1) Read and obey the safety precautions of the oxygen system and the general maintenance instructions before you do the maintenance (AMM 35-00-00/201).
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
AIPC 35-10-00 Fig. 2
(3)
WDM 23-51-01, 23-51-02, 23-51-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
C. Access
(1) Location Zones
101 Control Cabin (Left)
102 Control Cabin (Right)
D. Procedure - Prepare to Remove the Demand Regulator
S 864-039
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) On the main power distribution panel, P6:
1) C018 or C020, INPH AND WARN, or SERVICE INPH, or OBS INPH
2) B021, CAPT AND AUDIO, or
CAPT AUDIO, or
CAPT AND OBS-INPH
3) B020, F/0 AUDIO, or
F/O AND E/R INPH, or
F/O INPH
4) C019, or C021 OBS AUDIO, or
FLT INPH AMPL or
INPH AMPL or
TRAINING INPH
S 844-040
(2) Release the pressure from the crew oxygen system (depressurize).
CAUTION: DO NOT TIGHTEN THE VALVE MORE THAN THE GIVEN TORQUE.
_______
DAMAGE TO THE VALVE CAN OCCUR.
(a) Close the shutoff valve on the crew oxygen cylinder.
NOTE: When you tighten the valve by hand, this
____ is equivalent to a maximum torque of 25 pound-inches.
(b)
Set one of the mask regulators of the crew oxygen system to 100 percent emergency oxygen.
(c)
Move the test lever on the sliding control on mask storage box and bleed the oxygen from the lines.
E. Procedure - Demand Regulator Removal
S 014-041
(1)
Remove the mask from the storage box.
(a)
Loosen the lock screw found in the mask where the mask connects to the regulator.
(b)
Push the mask lock to the rear.
(2)
Remove the demand regulator.
S 024-042
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35-12-86
ALL ú ú 02 Page 408 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TASK 35-12-86-404-044
7. Mask Demand Regulator Installation
__________________________________
A. General
(1) Read and obey the safety precautions of the oxygen system and the general maintenance instructions before you do the maintenance (AMM 35-00-00/201).
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
AMM 35-12-00/501, Crew Oxygen System
(3)
AMM 35-12-85/201, Crew Oxygen Mask
(4)
AIPC 35-10-00 Fig. 2
(5)
WDM 23-51-01, 23-51-02, 23-51-03
C. Access
(1) Location Zones
101 Control Cabin (Left)
102 Control Cabin (Right)
D. Procedure
S 424-046
(1) Install the demand regulator.
(a)
Put the regulator in its position on the mask.
(b)
Move the mask lock forward to attach the regulator to the mask.
(c)
Tighten the lock screw.
S 864-047
(2) Pressurize the crew oxygen system.
(a) Put the mask regulator of the crew oxygen system to N (normal).
WARNING: YOU MUST OPEN THE SHUTOFF VALVE SLOWLY AND CAREFULLY OR
_______ HIGH TEMPERATURES CAN OCCUR. THIS CAN CAUSE A FIRE OR AN EXPLOSION AND INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT CAN OCCUR.
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