H. Put the Airplane Back to its Usual Condition
 S 085-061
 (1) Close the shutoff valve on the portable test cylinder shutoff.
 NOTE: The shutoff valve can be closed by your hand which is
____
 equivalent to 25 pound-inches.

 S 085-047
 WARNING:_______LOOSEN THE SUPPLY LINE CONNECTIONS CAREFULLY. THE REMAINING OXYGEN CAN BE AS HIGH AS 1850 PSI AND CAN RELEASE WITH A LARGE FORCE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (2)  Slowly disconnect the portable test cylinder, 0-2000 psi pressure gage, flexible hoses, and the tee fittings.
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747-400 MAINTENANCE MANUAL
 S 865-073
 WARNING:_______LOOSEN THE SUPPLY LINE CONNECTIONS CAREFULLY. THE REMAINING OXYGEN CAN BE AS HIGH AS 1850 PSI AND CAN RELEASE WITH A LARGE FORCE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (3)  Remove the cap and connect the fittings to points A and B (Fig. 501).
 S 865-055
 WARNING: OPEN THE SHUTOFF VALVE ON EACH CREW OXYGEN CYLINDER SLOWLY.
_______ THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
 (4) Open the shutoff valves on each crew oxygen cylinder as follows:
 (a) Slowly turn the shutoff valve until it is fully open.
 NOTE: But, do not torque the shutoff valve more than 25
____ pound-inches. This is equivalent to a torque which is tightened by your fingers.
 (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 795-274
 (5)  
Do a check of the connections at points A (Fig. 501) for leaks with the leak detection compound.

 S 035-197

 (6)  
Rub the leak detection compound off with a clean cotton cloth immediately after the check.

 (7)  
Close the access door to the crew oxygen cylinder.

 S 865-062

 (8)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 865-111
 TASK 35-11-00-795-205
 7. Crew Oxygen System Test
_______________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 35-00-00/201, Oxygen

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747-400
MAINTENANCE MANUAL

 B. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment, Aft Half Right 221 Control Cabin, Left 222 Control Cabin, Right
 C. Procedure
 S 915-171
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 865-172

 (2)  
Supply the electrical power (AMM 24-22-00/201).

 S 865-173

 (3)  
Open the access door to the crew oxygen cylinders.

 S 865-175

 (4)  
Make sure shutoff valve on each crew oxygen cylinder is open.

 NOTE: Some airplanes have an optional second crew oxygen cylinder.
____
 S 865-176
 (5)  Close these circuit breakers and attach DO-NOT-REMOVE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND

 S 715-206
 (6)  Do the task: Crew Oxygen Pressure Indication Test.
 NOTE: It is not necessary to do the step "Put Back in the
____
 Initial Condition" part of the test.

 D. Do the Mask Demand/Regulator and Stowage Box Test
 NOTE: This test is done at all crew stations.
____
 S 715-199
 (1)  
　
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