757
MAINTENANCE MANUAL

FILL
LINE
SEE A
PASSENGER OXYGEN CYLINDER
VENT LINE OVERBOARD  FWD 
SEE  B 
OVERBOARD VENT  PASSENGER OXYGEN FILL PANEL CSEE CONTINUOUS FLOW CONTROL UNITS  FILL LINE 

Passenger Oxygen Cylinder Rack
(Shown with Access Panels Removed)
Figure 304 (sheet 1)

E68146
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
OXYGEN PRESSURE OXYGEN PRESSURE INDICATOR INDICATOR
PASSENGER
OXYGEN FILL PASSENGER CYLINDER LINE OXYGEN CYLINDER
CYLINDER SHUTOFF VALVE
TO OXYGEN FILL PANEL OVERBOARD VENT LINE
OXYGEN FILL LINE
CYLINDEROVERBOARD SHUTOFFVENT LINE VALVE
A
B  TO OXYGEN FILL PANEL
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
PASSENGER 
OXYGEN 
FILL PANEL 
TEMPERATURE 
COMPENSATOR 
FILL FITTING 
OXYGEN 
PRESSURE 
INDICATOR 
INBD
PASSENGER  FILL LINE 
OXYGEN 
CYLINDER 
FWD  RACK 
PASSENGER OXYGEN FILL PANEL 
C
Passenger Oxygen Cylinder Rack 
Figure 304 (Sheet 2) 

A
757 MAINTENANCE MANUAL
 S 023-011
 (10) Pull the oxygen cylinder forward and remove it.
 NOTE: The weight of an oxygen cylinder is usually 35 to 43 pounds.
____
 S 493-012
 WARNING:_______YOU MUST PUT CAPS ON THE OPENINGS. MAKE SURE THE CAPS YOU USE ARE CLEAN. YOU MUST USE METAL CAPS WHEN THERE ARE CONNECTOR THREADS TO ENGAGE WITH THREADS IN THE CAP. AFTER YOU USE THEM, YOU MUST DISCARD OR CLEAN THE CAPS. REFER TO THE OVERHAUL MANUAL FOR THE PROCEDURES TO CLEAN THE OXYGEN SYSTEM COMPONENTS.
 (11) Install caps on the oxygen cylinder port and on all the line openings to keep the system clean.
 S 493-013
 CAUTION:_______YOU MUST TIGHTEN THE CAP TO THE CORRECT TORQUE. IF YOU DO NOT CORRECTLY TIGHTEN THE CAP, THE CYLINDER PRESSURE CAN DECREASE.
 (12) When you remove a cylinder with a metal valve-seat in the shutoff valve, you will find a cap. The cap is held by a chain to the valve. Install and tighten this cap to 350-400 pound-inches (40-45 newton meters) on the inlet/outlet line.
 G. Procedure - Install the Crew Oxygen Cylinder
 S 913-015
 WARNING:_______OBEY THE CREW OXYGEN SYSTEM - MAINTENANCE PRACTICES. IF YOU DO NOT OBEY THE CORRECT PROCEDURES, A FIRE OR AN EXPLOSION CAN EASILY OCCUR. A FIRE OR AN EXPLOSION CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT.
 (1)  
Read and obey the Maintenance Practices procedures for the crew oxygen system (Ref 35-11-00/201).

 (2)
Make sure the airplane is grounded correctly (AMM 20-41-01/201).

 S 863-166

 (3)  
Make sure these circuit breakers are opened with the DO-NOT-CLOSE tags installed:

 S 493-016
 (a)  On the overhead circuit breaker panel, P11:
 1) 11S33, OXYGEN PRESS
 2) GUN 004-007;

 11S32, PASS OXY PRESS
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757
MAINTENANCE MANUAL

 (b)  GUN 004-007;
 On the APU/EXT power panel, P34:
 1) 34B2, PASS OXY PRESS IND

 S 213-017
 (4)  Make sure it has not been more than three years since the replacement oxygen cylinder had its last hydrostatic test.
　
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