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12-15-08
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 613-054
(9) If the pressure value shown on the indicator or on the cylinder gages is 50 psi (344.7 kPa) or less, do the steps that follow:
CAUTION: DO NOT APPLY TOO MUCH TORQUE WHEN YOU CLOSE THE SHUTOFF
_______ VALVES. DAMAGE TO THE TORQUE VALVES WILL OCCUR IF YOU APPLY TOO MUCH TORQUE.
(a) Close all the shutoff valves.
NOTE: Do not apply more than 25 pound-inches (2.8 newton
____ meters) of torque. Turn valve in the clockwise direction.
CAUTION: TO PREVENT CONTAMINATION IN THE OXYGEN SYSTEM, MAKE SURE
_______ THE SUPPLEMENTAL GAGE IS CLEAN. IT MUST BE FREE OF PETROLEUM, HYDRAULIC FLUID, OIL, GREASE, AND DIRT.
(b) Install the supplemental pressure gage at a satisfactory location in the high pressure oxygen line.
CAUTION: DO NOT APPLY TOO MUCH TORQUE WHEN YOU OPEN THE SHUTOFF
_______ VALVES. YOU WILL CAUSE DAMAGE TO THE VALVES IF YOU APPLY TOO MUCH TORQUE.
(c) Slowly open all the shutoff valves for the passenger oxygen system.
NOTE: Do not apply more than 25 pound-inches (2.8 newton
____ meters) of torque. Turn the valve in a counter clockwise direction.
(d) If the pressure shown on the supplemental pressure gage is less than 5 psig (34.5 kPa), do the steps that follow:
CAUTION: DO NOT APPLY TOO MUCH TORQUE WHEN YOU CLOSE THE
_______ SHUTOFF VALVES. IF YOU APPLY TOO MUCH TORQUE, YOU WILL CAUSE DAMAGE TO THE VALVES.
1) Close all the shutoff valves for the oxygen cylinders.
NOTE: Do not apply more than 25 pound-inches (2.8 newton
____ meters) of torque. Turn the valve in a clockwise direction.
2) Remove the supplemental pressure gage and put the high pressure line back to a serviceable condition.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-15-08
ALL ú ú 01 Page 323 ú Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(e)
A
757
MAINTENANCE MANUAL
3) Remove all the passenger oxygen cylinders. Refer to the Crew Oxygen System Servicing (Cylinder Replacement) paragraph for instructions.
4) Install eleven fully serviced oxygen cylinders. Refer to the Crew Oxygen System Servicing (Cylinder Replacement) paragraph.
CAUTION: DO NOT APPLY TOO MUCH TORQUE WHEN YOU OPEN THE
_______ SHUTOFF VALVES. IF YOU APPLY TOO MUCH TORQUE, YOU WILL CAUSE DAMAGE TO THE SHUTOFF VALVES.
5) Slowly open all the shutoff valves to the fully open condition.
NOTE: Do not apply more than 25 pound-inches (2.8 newton
____ meters). Turn the valves in the counter clockwise direction.
6) Turn all the valves back 1/4-turn. Install the lockwire to hold them in this position.
NOTE: Use the 0.020 inch diameter lockwire
____
(AMM 20-10-23/401).
7) Do a leakage check of the coupling assembly connections for leakage with the leak detection compound. 8) Remove the leak detection compound with a clean cloth immediately after the check. 9) Do the Put the Airplane Back in it Usual Condition
paragraph.If the pressure shown on the supplemental pressure gage is 5 psig (34.5 kPa) or more, do the steps that follow:
CAUTION: DO NOT APPLY TOO MUCH TORQUE WHEN YOU CLOSE THE
_______ SHUTOFF VALVES. IF YOU APPLY TOO MUCH TORQUE, YOU WILL CAUSE DAMAGE TO THE VALVES.
1) Close all the shutoff valves for the oxygen cylinders.
NOTE: Do not apply more than 25 pound-inches (2.8 newton
____ meters) of torque. Turn the valve in a clockwise direction.
2) Remove the supplemental pressure gage. Put the high pressure line back to a serviceable condition.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-15-08
ALL ú ú 01 Page 324 ú Sep 28/00
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