(5)
Install the flow control unit:
(a)
Set the flow control unit in position.
(b)
Loosely connect the inlet and the outlet lines.
(c)
Loosely connect the switch bar to the reset lever on the flow control unit.
(d)
Attach the flow control unit and the bonding jumper (if applicable) loosely to the support channel with the mounting fasteners.
(e)
Tighten the line connections.
(f)
Tighten the mounting fasteners.
(g)
Loosely attach the reset levers to the switch bar.
NOTE: Keep a 0.01-inch maximum clearance between each
____ lever and its plunger per detail B, figure 401.
(h) Make sure the reset lever on the flow control unit is in same position relative to its plunger.
S 434-015-003
(6) Connect the electrical connectors:
(a) DM101 electrical connector to the M101 electropneumatic unit.
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747-400 MAINTENANCE MANUAL
(7) S 434-016-003Tighten the lockbolts to the switch bar.
(8) S 864-017-003Supply electrical power (AMM 24-22-00/201).
(9) S 864-018-003Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P7 Overhead Circuit Breaker Panel 1) 7D4 OXYGEN VALVE & IND 2) 7D3 OXY RESET PWR
S 864-019-003
(10) Reset the flow control units.
(a)
Momentarily move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to RESET.
(b)
Make sure the indicator on the flow control unit has moved away from ON.
S 714-020-003
(11) Do an operational test of the flow control units:
(a)
Move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to ON.
(b)
Make sure the indicator on the electropneumatic unit has moved to ON.
(c)
Reset the electropneumatic units. 1) Momentarily move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to RESET.
2) Make sure the indicator on the flow control unit has moved away from ON.
S 764-021-003
(12)
Make sure the resistance at the interfacing surfaces of the electrical bonding jumper is not more than 0.0225 ohms (BAC 5117).
S 734-022-003
(13)
To test the low pressure line connections for leaks, do the "Oxygen System Low Pressure Leak Test" (AMM 35-21-00/501).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
S 864-023-003
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.
(14) 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 inch-pounds.
(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 794-024-003
(15)
Do a check of the high pressure line connection for leaks with the leak detection compound for the oxygen system.
S 214-025-003
(16)
Make sure all caps, covers or transit blanks have been removed from the flow control unit.
S 214-026-003
(17)
Make specially sure that the sense ports are not covered.
S 144-027-003
(18)
Immediately rub off the leak detection compound with a clean cotton cloth.
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