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747-400 MAINTENANCE MANUAL
2) Make sure the crew oxygen cylinder is clean. 3) Make sure the crew oxygen cylinder does not have nicks, cracks, dents, cuts, or any other damage.
S 416-011
(6) Close the access door to the crew oxygen cylinder.
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747-400 MAINTENANCE MANUAL
PRESSURE TRANSDUCER - REMOVAL/INSTALLATION
__________________________________________
1. General_______
A. These tasks are included in this procedure:
(1)
Removal of the pressure transducer.
(2)
Installation of the pressure transducer.
B. The removal and the installation procedures are for a single pressure transducer. To do the procedure for the second pressure transducer do the same steps again.
C. The pressure transducer is installed on the coupling assembly which is connected to the outlet port of the cylinder in the forward cargo compartment (Fig. 401). Access is through the cylinder access door.
TASK 35-11-03-004-001
2. Pressure Transducer Removal (Fig. 401)___________________________
A. Standard Tools and Equipment
(1) Caps and Plugs - Package of Clean Protective
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
IPC 35-11-03
(3)
SSM 35-11-01
(4)
WDM 35-11-13
C. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
D. Procedure
S 914-025
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 864-002
(2)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
(3)
Open the cylinder access door.
S 014-003
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747-400 MAINTENANCE MANUAL
SEE A
CREW OXYGEN CYLINDERS
SUPPLY
LINE B-NUT
BULKHEAD FITTING RETAINING NUT
SUPPORT CLAMP
SUPPLY
LINE B-NUT
PRESSURE TRANSDUCER PRESSURE TRANSDUCER COUPLING ASSEMBLY
CYLINDER
ACCESS DOOR
FWD CYLINDER SUPPORT CLAMP
SHUTOFF VALVE
A
Pressure Transducer Installation
Figure 401
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S 864-004
CAUTION: DO NOT TIGHTEN 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 slowly.
NOTE: The shutoff valve can be tightened by hand which is
____
equivalent to 25 pound-inches.
S 034-006
(5)
Disconnect the electrical connector.
S 024-007
(6)
Remove the pressure transducer:
WARNING:_______LOOSEN THE FITTING CONNECTIONS CAREFULLY. IF NOT, THE REMAINING OXYGEN CAN RELEASE WITH A LARGE FORCE AND CAUSE THE TEMPERATURE TO INCREASE. THIS CAN START AN IGNITION WITH THE OXYGEN AND CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
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