S 793-031
(17)
Do a leakage check on the oxygen cylinder couplings with the leak detection compound.
S 793-032
(18)
Remove the leak detection compound with a clean cloth immediately after you do the check.
S 213-033
(19)
Immediately compare the pressure shown on the status page of the EICAS and the pressure shown on the cylinder gage.
NOTE: The difference of the pressure values must be less
____
than 100 PSI.
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757 MAINTENANCE MANUAL
S 433-034
(20)
For oxygen cylinders with a cap held by a chain, install the lockwire on the cap to decrease its movement.
S 413-035
(21)
Close the access door for the oxygen cylinder.
S 863-036
(22)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
TASK 12-15-08-603-157
3. GUN 004-007; Passenger Oxygen System Servicing (Cylinder Replacement) (Fig. 303, Fig. 304)
________________________________________________________
NOTE: This procedure is used when an unserviceable oxygen cylinder is
____
replaced. Normal servicing is by the external fill method.
A. General
(1)
The passenger oxygen cylinders are found in the aft cargo compartment.
(2)
For cylinders with less than 5 psig (34.5 kPa) you must replace the cylinder with one that is fully serviceable. Cylinders with less than 5 psig (34.5 kPa) usually contain too much fluid. Use this procedure to replace the unserviceable oxygen cylinder.
(3)
Read and obey the Passenger Oxygen System - Maintenance Practices before you do the servicing (AMM 35-21-00/201).
B. Equipment
(1)
Caps and Plugs - Clean, Packaged (for oxygen
ports and open lines)
(2)
Oxygen Cylinders - Fully Charged and Serviceable
(3)
Spanner Wrench - Commercially Available
C. Consumable Materials
(1) G00092 Oxygen System Leak Detection
Compound - Sherlock CG Type 1
D. References
(1)
AMM 20-11-00/201, Standard Torque Values
(2)
AMM 20-41-00/201, Static Grounding
(3)
AMM 24-22-00/201, Electrical Power - Control
(4)
AMM 35-21-00/201, Passenger Oxygen System
E. Access
(1) Location Zones
161/162 Bulk Cargo Compartment
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F. Procedure - Remove the Passenger Oxygen Cylinder
S 913-105
WARNING: OBEY THE MAINTENANCE PRACTICES GIVEN FOR THE PASSENGER OXYGEN
_______ SYSTEM. IF YOU DO NOT OBEY THEM, A FIRE OR AN EXPLOSION CAN OCCUR.
(1)
Read and obey the Passenger Oxygen System - Maintenance
Practices (AMM 35-21-00/201).
S 493-106
(2)
Make sure the airplane is grounded correctly (AMM 20-41-01/201).
S 863-159
(3)
Open these circuit breakers and install DO-NOT-CLOSE tags:
(a)
On the overhead circuit breaker panel, P11:
1) 11S33, OXYGEN PRESS
2) 11S32, PASS OXY PRESS
(b)
On the APU/EXT power panel, P34:
1) 34B2, PASS OXY PRESS IND
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