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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 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 VALVES.
 3)  Slowly open all the shutoff valves for the passenger oxygen cylinders.
 NOTE: Do not apply more than 25 pound-inches (2.8 newton
____ meters) of torque. Turn the valve in a counter clockwise direction.
 4)  Turn the valve back 1/4-turn. Install the lockwire to hold the valve in this position.
 NOTE: Use the 0.020 inch diameter copper lockwire
____ (AMM 20-10-23/401).
 5)  Do the Service the Passenger Oxygen Cylinders task.
 TASK 12-15-08-603-055
 5.  GUN 004-007; Servicing the Passenger Oxygen Cylinders
________________________________________
 A.  General
 (1)  
Do the servicing of the passenger oxygen system manually through a filler valve that controls the rate of filling and the final pressure.

 (2)  
Read and obey the information that follow before you do the servicing operation.

 CAUTION: DO NOT DO THE SERVICING A SECOND TIME UNTIL YOU MANUALLY
_______ SET THE TEMPERATURE AND PRESSURE DIALS TO THE NEW VALUES. THIS WILL HELP MAKE SURE THE AUTOMATIC SHUTDOWN IS SET AT THE CORRECT CYLINDER PRESSURE.
 (3)  
If you must do the servicing two times, you must set the filler valve temperature and pressure dials to the new temperature and pressure values.

 (4)  
Approved Servicing Persons

 (a)  Permit only approved persons to do the oxygen servicing. An approved person must know: 1) The operation of the airplane oxygen servicing panel, 2) The operation of the oxygen ground servicing equipment, 3) The connection of the ground servicing equipment to the
 filler port of the airplane servicing panel, 4) What to do if there is an emergency situation.
 (5)  Precaution Data
 (a)  Before you do the servicing of the oxygen system, read the Passenger Oxygen System - Maintenance Practices (AMM 35-21-00/201).
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 12-15-08
 ALL  ú ú 01 Page 325 ú Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 (b)  
Make sure your hands, clothing, tools, the area, and the equipment are all clean. They must be free of petroleum, oil, grease, hydraulic fluid, and dirt.

 (c)  
Keep the oxygen away from all things that can start ignition.

 (d)  
Do not let the oxygen mix with other gases, fumes, or flammable materials.

 (e)  
Use only aviation-grade breathing oxygen.

 NOTE: Welding oxygen and hospital oxygen can be satisfactory
____ to breathe, but it can contain too much water. The water can freeze and stop the flow in the lines, regulators, and valves.
 (f)  
You must open the valves slowly. If you open the valves quickly, the oxygen can get too hot. If you open the valves slowly, you decrease the risk of a fire.

 (g)  
Use the pressure reducing valve on the oxygen servicing equipment to control the supply pressure.

 B. Equipment
 WARNING: TO REDUCE THE RISK OF A FIRE, MAKE SURE THE OXYGEN
_______
 SERVICING EQUIPMENT IS CORRECTLY MAINTAINED AND CLEAN.
 REFER TO THE PASSENGER OXYGEN SYSTEM MAINTENANCE
 PRACTICES (AMM 35-21-00/201).

 (1)  Oxygen - Ground Servicing Equipment
 NOTE: You must have all these components for a satisfactory system.
____
 (a)  
High-pressure oxygen storage cylinders
 with shutoff valves to supply the oxygen.
 There must be sufficient pressure and
 volume to fill the airplane oxygen
 cylinder to their capacity.

 (b)  
Manifold and other high-pressure tubes made
 from brass or a corrosion resistant steel.

 (c)  
Check-valves with a brass body and metal
 seats.

 (d)  
A filter with sintered-bronze filter
 element.

 (e)  
A pressure reducing valve with these properties: 1) Heavy-duty type with a brass body, 2) Manual pressure adjustment 0 to 3000 psi (20684.3 kPa), 3) Pressure gages to show the supply cylinder pressure at the
　
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