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MAINTENANCE MANUAL
STATION BODY BUTTOCK LINE LINE WATER ACCESS THROUGH
440.0 20.0 R 390.0 LAVATORY (AMM 35-21-19/401). REMOVE THE ATTENDANT'S OXYGEN BOX IN THE UPPER DECK
Bleed Relief Valve Location and Access
Figure 402
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C22123
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747-400
MAINTENANCE MANUAL
C. Access
(1) Location Zone
200 Upper Half Fuselage
D. Procedure
S 914-018
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 434-009
(2)
Remove the protective cap or plug from the adapter.
S 214-019
(3)
Examine the fittings (threads) to make sure they are clean.
S 434-010
(4)
Install new O-ring on the bleed relief valve if necessary.
S 424-011
CAUTION: ATTACH A WRENCH TO THE FLAT SIDES OF THE ADAPTER AND HOLD
_______ THE ADAPTER WHEN YOU REMOVE THE BLEED RELIEF VALVES. THIS WILL PREVENT DAMAGE TO THE DISTRIBUTION LINES.
(5)
Turn the screw threads of the bleed relief valve into the adapter, and tighten to a torque value of 65 to 80 pound-inches.
S 434-012
(6)
Install the safety wire.
S 414-013
(7)
Put back all the items that were removed to get access to the bleed relief valves (Figure 402).
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747-400 MAINTENANCE MANUAL
S 864-025
WARNING:_______ OPEN THE SHUTOFF VALVE ON EACH 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 EACH OXYGEN CYLINDER MORE
THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF
VALVE.
(8)
Open the shutoff valve on each 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. S 794-026
(9)
Do the Task: Oxygen Low Pressure Leak Test (AMM 35-21-00/501), to do a check for leaks.
S 414-016
(10)
Close the access panels to oxygen cylinders.
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747-400 MAINTENANCE MANUAL
BLEED RELIEF VALVE - ADJUSTMENT/TEST
____________________________________
1. General_______
A. This task is included in this procedure:
(1) Functional test of the bleed relief valve
B. Bleed relief valves are installed in the distribution lines for the low oxygen pressure. Access and location to the bleed relief valves are shown in 35-21-08/401.
TASK 35-21-08-705-001
2. Bleed Relief Valve Functional Test__________________________________
A. Special Tools and Equipment
(1) ME65B50263-3 - Leak Test Kit, Passenger Oxygen System
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