S 715-027
(11)
Release the stowage box PRESS TO TEST AND RESET lever.
S 715-028
(12)
Make sure the lever goes back to the initial position.
S 715-029
(13)
Push the N-100% control on the demand regulator to make sure it operates.
S 715-030
(14)
Move the N-100% control to the normal position.
S 715-032
(15)
Do the task:" Crew Oxygen Mask and Demand Regulator Stowage Box In-Situ Test" for all the other crew mask positions.
S 865-109
(16)
Close the access door to the crew oxygen cylinders.
S 865-060
(17)
Remove the electrical power if it is not necessary (Ref 24-22-00/201).
TASK 35-11-00-715-036
5. Crew Oxygen Mask/Regulator Test (Fig. 502)
_______________________________
A. References
(1)
24-22-00/201, Electrical Power - Control
(2)
35-00-00/201, Oxygen
B. Access
(1) Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 221 Control Cabin, Left 222 Control Cabin, Right
C. Preconditions
S 865-254
(1) The systems that follow must be installed and serviceable to complete this test:
(a)
Electrical Power (AMM 24-22-00/201).
(b)
Airplane must be in the ground mode (AMM 32-09-02/201).
(c)
Crew Oxygen System in serviceable condition (AMM 35-21-00/501).
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747-400 MAINTENANCE MANUAL
D. Procedure
S 915-049
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).
S 865-050
(2)
Supply electrical power (Ref 24-22-00/201).
S 865-038
(3)
Make sure that this circuit breaker is closed:
(a) On the overhead circuit breaker panel, P7:
1) 7D4, OXYGEN VALVE & IND
S 025-039
(4)
Remove the mask/regulator from the stowage box.
S 755-040
(5)
Hold the mask, and push and hold the harness inflation control.
S 755-042
(6)
Make sure the flow blinker becomes yellow and then black.
NOTE: This shows that the harness does not have a leak.
____
S 715-051
(7)
Release the button.
S 755-044
(8)
Put the mask/regulator unit on your head.
NOTE: The pneumatic harness will inflate until it holds your head.
____
S 755-046
(9)
Breathe through the mask/regulator unit with the regulator turned to dilution, and when it is turned to the "100%" position.
S 755-052
(10)
Make sure you can breathe correctly in each position on the flow blinker.
S 755-048
(11)
With the lever set in the "100%" position, turn the EMERGENCY control knob.
(12)
After three breaths, cancel the emergency pressure.
S 755-053
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747-400 MAINTENANCE MANUAL
S 755-047
(13) Do these steps to do a test of the oxygen mask microphone:
(a)
Push the FLT microphone selector switch on the audio control panel (ACP).
(b)
Push and hold the PTT (R/T/INT) switch on the ACP to the INT position.
(c)
Speak into the oxygen mask microphone.
(d)
Make sure your voice can be heard on a pilot's headset or flight deck speakers.
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本文链接地址：747-400 AMM 飞机维护手册 氧气 OXYGEN(19)
