S 865-065
(4)
Move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to ON (switch automatically moves back to NORMAL).
S 865-066
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON THE PORTABLE TEST CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(5) Close the shutoff valve on the portable test cylinder.
NOTE: The shutoff valve can be closed with your hand which is
____
equivalent to 25 pound-iches.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
35-21-00
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747-400 MAINTENANCE MANUAL
(6) S 865-067Move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to RESET (switch automatically moves back to NORMAL).
(7) S 735-068Make sure the indicator on the flow control unit moves away from ON.
S 085-069
WARNING:_______LOOSEN THE CONNECTIONS CAREFULLY. THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE AND CAUSE THE TEMPERATURE TO INCREASE. THIS CAN START AN IGNITION WITH THE OXYGEN AND CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
(8)
Slowly disconnect the portable test cylinder at point B (Fig. 501) and install a plug on the opening.
S 735-070
(9)
Do the Pressure Reducer Functional Test for all other pressure reducers on the supernumerary oxygen cylinders.
S 865-071
(10)
Install the caps to the two welded outlets on the distribution line, for low pressure, in the passenger cabin.
S 415-072
(11)
Close the oxygen mask doors:
(a)
Carefully put a 1/4-inch Allen wrench or metal rod through the manual release access hole and lift the plunger on the latch.
(b)
Lift the oxygen box door until it engages the latch and remove the Allen wrench or metal rod.
S 865-073
(12)
Remove the tape or other devices used to hold the oxygen boxes closed.
S 085-074
(13)
Remove the 0-2000 psi pressure gauge from the supply manifold at point C (Fig. 501) and install a plug in the opening.
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747-400 MAINTENANCE MANUAL
S 865-075
WARNING:_______OPEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER SLOWLY. HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION WITH THE OXYGEN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
(14) Open the shutoff valve on each oxygen cylinder:
(a) Slowly turn the shutoff valve until it is fully open.
NOTE: The shutoff valve can be closed with your hand which is
____ equivalent to 25 pound-inches.
(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 795-076
(15)
Do a check for leaks at test connections with a leak detection compound.
S 435-077
(16)
Rub the leak detection compound off with a clean cotton cloth immediately after the check.
S 415-078
(17)
Close the access panels to the oxygen cylinders.
S 865-079
(18)
Remove the electrical power if it is not necessary (Ref 24-22-00/201).
(19)
Do the task: Oxygen System Mask Drop Test.
S 715-080
TASK 35-21-00-795-081
5. Oxygen System High Pressure Leak Test (Fig. 501)
_____________________________________
A. Standard Tools and Equipment
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