S 735-082
(10)
Do the task: "Crew Oxygen Pressure Reducer and Pressure Regulator test" for the pressure reducer on the other crew oxygen cylinder if installed.
H. Put the System Back in its Initial Condition
S 865-151
WARNING:_______OPEN THE SHUTOFF VALVE ON THE 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.
(1) Slowly open the shutoff valve 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).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
35-11-00
ALL ú ú 01 Page 520 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 795-137
(2)
Do a check of the conncections for leaks (Point A, Fig. 501) with the leak detection compound.
S 035-178
(3)
Rub the leak detection compound off with a clean cotton cloth immediately after you do the check.
S 865-143
(4)
Close the access door to the crew oxygen cylinder.
S 865-064
(5)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
I. Do a Test of the Pressure Regulator
S 865-065
(1)
Supply the electrical power (AMM 24-22-00/201).
S 015-092
(2)
Remove the closure assembly in the right coat closet to get to the pressure regulator.
S 865-115
(3)
Open the access door to crew oxygen cylinder.
S 865-067
CAUTION: DO NOT TORQUE THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(4) Close the shutoff valve on the crew oxygen cylinder(s).
NOTE: The shutoff valve can be closed by your hand which is
____
equivalent to 25 pound-inches.
S 865-094
(5)
Slowly disconnect the outlet line on the pressure regulator, and put a cap the outlet line.
S 485-095
(6)
Connect the 0-150 psi pressure gage to the pressure regulator outlet.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
35-11-00
ALL ú ú 01 Page 521 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-096
WARNING:_______OPEN THE SHUTOFF VALVE ON THE 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.
(7) Slowly open the shutoff valve on each crew oxygen cylinder as follows:
NOTE: Some airplanes have an optional second crew oxygen cylinder.
____
(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 tighten by your fingers.
(b)
Close the shutoff valve one-fourth of a turn. S 785-098
(8) Make sure the 0-150 psi pressure gage is between 60 and 85 psig.
J. Put the System Back to its Initial Condition
S 865-144 CAUTION: DO NOT TORQUE THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER
_______ MORE THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(1) Close the shutoff valve on the crew oxygen cylinder.
NOTE: The shutoff valve can be closed by hand which is
____
equivalent to 25 pound-inches.
S 085-099
(2)
Slowly disconnect the 0-150 psi pressure gage and permit the system to bleed down.
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