(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
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747-400
MAINTENANCE MANUAL
Pressure Transducer Installation
Figure 401
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747-400 MAINTENANCE MANUAL
S 014-004
(3) Open the access panel to the oxygen cylinders.
S 864-025
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(4) Close the shutoff valve on each 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 applicable electrical connector to the pressure transducer.
S 024-007
(6)
Remove the pressure transducer.
WARNING:_______LOOSEN THE B-NUT ON THE HIGHT PRESSURE LINE 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.
(a)
Slowly and continuously loosen the B-nut on the high pressure line from the pressure transducer to reduce the pressure.
(b)
Remove the pressure transducer.
S 034-008
(7) Install a protective cap and plug to the open oxygen line and the inlet port on the pressure transducer.
NOTE: This will prevent contamination of the system.
____
TASK 35-21-11-404-009
3. Pressure Transducer Installation (Fig. 401)________________________________
A. Consumable Materials
(1)
G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)
(2)
G00713 Cloth - Clean, Dry, Lint-Free, White, Cotton
B. References
(1) AMM 24-22-00/201, Manual Control
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747-400
MAINTENANCE MANUAL
(2)
AMM 35-00-00/201, Oxygen
(3)
AMM 35-21-00/501, Oxygen System
(4)
IPC 35-21-11
(5)
SSM 35-11-01
(6)
WDM 35-11-13
C. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
D. Procedure
S 914-022
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 434-010
(2)
Remove the protective cap and the plug.
S 214-023
(3)
Examine the fittings (threads) to make sure they are clean.
S 424-011
(4)
Install the pressure transducer:
(a)
Align the inlet port on the pressure transducer with coupling assembly and install the B-nut loosely.
(b)
Tighten the B-nut to 170 - 200 pound-inches.
NOTE: Use a torque wrench and a backup wrench to prevent
____
damage to other components.
S 434-012
(5)
Connect the electrical connector.
(6)
Supply the electrical power (AMM 24-22-00/201).
S 864-014
(7)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
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