S 865-075

 (2)  
Remove the mask and the demand/regulator from the stowage box (Ref 35-11-18/201).

 S 735-106

 (3)  
Make sure the N-100% control is at the N and the PRESS TO TEST knob is at non-emergency.

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747-400 MAINTENANCE MANUAL
 (4)  S 865-076Push the harness inflation ears on the demand/regulator and hold in position.
 (5)  S 735-077Make sure the flow blinker on stowage box momentarily shows flow and then goes off.
 (6)  S 865-078Put the mask and demand/regulator on and release the harness inflation ears.
 (7)  S 735-079Make sure the harness deflates and goes down to the head shape.
 (8)  S 865-080Close the stowage box doors.
 (9)  S 715-207Breathe through the mask.
 S 735-081

 (10)
 Make sure the flow blinker shows flow when you inhale.

 S 715-208

 (11)
 Make sure you can breathe without difficulty.

 S 865-084

 (12)
 Turn the PRESS TO TEST knob to EMERGENCY.

 S 735-085

 (13)
 Breathe thru the mask, and make sure you can breathe without difficulty.

 S 865-248

 (14)
 Turn the PRESS TO TEST knob to non-emergency.

 S 865-087

 (15)
 Make sure the N-100% control can be moved to the N position.

 S 015-209

 (16)
 Move the N-100% control to the 100% position.

 S 865-088

 (17)
 Push the harness inflation ears on the demand/regulator and remove the mask and demand/regulator from your head.

 S 715-210

 (18)
 Release the inflation ears.

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MAINTENANCE MANUAL

 S 735-070
 (19) 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.

 (e)  
Release the PTT switch on the ACP.

 S 865-090
 (20)
 Put the mask and demand/regulator in the stowage box (AMM 35-11-18/201).

 S 735-091

 (21)
 Do the task: "Crew Oxygen Mask and Demand/Regulator Stowage Box Test" for all the other crew stations with the crew mask.

 S 865-114

 (22)
 Close the access door to the crew oxygen cylinders.

 S 725-200

 (23)
 Do the task: "Crew Oxygen Pressure Reducer and Pressure Regulator Test"

 TASK 35-11-00-725-198
 8. Crew Oxygen Pressure Reducer and Pressure Regulator Test
________________________________________________________
 A. Standard Tools and Equipment
 (1)  
Gage - Pressure, 0-2000 psi

 (2)  
Hoses - Flexible, Clean High Pressure

 (3)  
Fittings - Tee, Clean (as applicable)

 B. Consumable Materials
 (1)  
G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)

 (2)  
G00713 Cloth - Clean, Dry, Lint-Free, White Cotton

 (3) G01505 Copper Lockwire 0.020 inch diameter G01505
 C. References
 (1)  
AMM 20-41-01/201, Static Grounding

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 35-00-00/201, Oxygen

 D. Access
 (1)  Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 221 Control Cabin, Left 222 Control Cabin, Right
　
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