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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A
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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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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