(b)
Disconnect the pressure reducer.
(c)
Loosen the two screws in the clamp which supports the transducer and remove the pressure trannsducer.
S 034-008
(7) Install the protective cap and the plug to the open oxygen line and the transducer inlet port.
NOTE: This will prevent contamination of the system.
____
TASK 35-11-03-404-009
3. Pressure Transducer Installation (Fig. 401)________________________________
A. Consumable Materials
(1) G00091 Compound - Oxygen System Leak Detection (MIL-L-25567)
B. References
(1) AMM 24-22-00/201, Manual Control
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A
747-400
MAINTENANCE MANUAL
(2)
AMM 35-00-00/201, Oxygen
(3)
AMM 35-11-00/501, Crew Oxygen System
(4)
IPC 35-11-03
(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 914-026
(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 plug from the oxygen line and
transducer inlet port.
S 214-027
(3)
Examine the threads on the fittings to make sure they are clean.
S 424-011
(4)
Install the pressure transducer:
(a)
Put the pressure transducer in the support clamp with the port aligned with the 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.
(c) Tighten the support clamp screws.
S 434-012
(5)
Connect the electrical connector.
(6)
Supply the electrical power (AMM 24-22-00/201).
S 864-014
(7)
Close this circuit breaker and attach a DO-NOT-CLOSE tag:
S 864-013
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
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A
747-400
MAINTENANCE MANUAL
S 864-015
WARNING:_______ OPEN THE SHUTOFF VALVE ON THE CREW OXYGEN CYLINDER SLOWLY. IF
NOT, HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION
WITH THE OXYGEN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE
TO THE AIRPLANE AND EQUIPMENT.
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.
(8) Open the shutoff valve on the crew oxygen cylinder:
(a) Slowly turn the shutoff valve until it is fully open.
NOTE: The shutoff valve can be closed by hand which is
____ equivalent to 25 pound-inches.
(b)
Close the shutoff valve one-fourth of a turn.
(c)
Install a lockwire on the shutoff valve.
NOTE: Use the 0.020 inch diameter copper lockwire
____ (AMM 20-11-28/401).
S 784-017
(9) Do this task: "Operation Test - Crew Oxygen " (AMM 35-11-00/501).
NOTE: It is only neceasary to do up to the paragragh "Crew
____ Oxygen Pressure Indication Test" on the task "Operation Test
-Crew Oxygen".
S 794-018
(10)
Do a check of the pressure transducer connection for leaks with the leak detection compound.
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