35-21-04
ALL ú CONFIG 3 ú 02 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SEE A
B-NUT
TEST INLET
PORT LINE
LOW PRESSURE LINE FLOW CONTROL UNIT
TO THE UPPER
DECK CABIN
TEST
B-NUT CONNECTION
OUTLET ELECTRICAL
CONNECTION CONNECTOR
MOUNTING
SCREW
(4 LOCATIONS) RESET
LEVER
NUT TIE-ROD RESETCONNECTIONFWD SOLENOID (REF)
A
Continuous Flow Control Units Installation Figure 401
E23950
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35-21-04
ú ALL ú CONFIG 3
ú ú 02 Page 402
ú ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 864-005-003
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 INCH-POUNDS. 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 inch-pounds.
S 034-006-003
(5) Disconnect the electrical connectors:
(a) DM101 electrical connector from the M101 electropneumatic unit.
S 024-007-003
(6) Remove the flow control unit:
(a) Slowly and continuously loosen the B-nut on the inlet port of flow control unit to decrease pressure.
NOTE: Do not loosen the union on the flow control unit.
____
(b)
Disconnect the B-nut from the flow control unit.
(c)
Disconnect the reset lever from the switch bar.
(d)
Disconnect the outlet connector on the flow control unit.
(e)
Remove the flow control unit.
S 034-008-003
(7) Install the protective caps or plugs to the open lines, fittings or ports to prevent contamination of the system.
TASK 35-21-04-404-009-003
3. Flow Control Unit 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 20-11-14/701, Metal Surface Cleaning
(2)
AMM 20-22-01/601, Electrical Grounding
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 35-00-00/201, Oxygen
(5)
IPC 35-21-04
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A
747-400
MAINTENANCE MANUAL
C. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
D. Procedure
S 914-010-003
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 434-011-003
(2)
Remove the protective caps or plugs from the lines, fittings or ports.
S 214-012-003
(3)
Examine the threads of the fittings to make sure they are clean.
S 144-013-003
(4)
Do the task: "Hand Clean Metal Surfaces with Abrasives" (AMM 20-11-14/701) to fully clean the faying surfaces for the flow control unit.
S 424-014-003
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