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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