35-21-17
ALL ú ú 01 Page 401 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(2)
AMM 35-00-00/201, Oxygen
(3)
AMM 35-21-00/501, Oxygen System
(4)
SSM 35-11-01
(5)
WDM 35-11-11
B. Access
(1) Location Zone
117 Electrical and Electronics Compartment Left
C. Procedure
S 914-009
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 424-005
(2)
Install the decompression relay.
(a)
Connect the plug of the decompression relay into the panel.
(b)
Install the fasteners.
S 864-006
(3)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) P7 Overhead Circit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
(4)
Do the task: "Operational Test - Oxygen System" (AMM 35-21-00/501).
S 714-007
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35-21-17
ALL ú ú 01 Page 402 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
OXYGEN SYSTEM RESET SOLENOID - REMOVAL/INSTALLATION
___________________________________________________
1. General
_______
A. These tasks are included in this procedure:
(1)
Removal of the reset solenoid.
(2)
Installation of the reset solenoid.
B. The reset solenoid for the oxygen system is installed in the forward cargo compartment. It is in the right side sidewall which is adjacent to the continuous flow control units (Fig. 401). Access to the reset solenoid is through the access panels to the oxygen cylinders.
TASK 35-21-18-004-001
2. Reset Solenoid Removal (Fig. 401)
______________________
A. References
(1)
AMM 35-00-00/201, Oxygen
(2)
IPC 35-21-18
(3)
SSM 35-11-01
(4)
WDM 35-11-11
B. Access
(1) Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
C. Procedure
S 914-021
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
(2)
Open the access panel to the oxygen cylinders.
S 014-029
S 864-027
CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON EACH OXYGEN CYLINDER MORE
_______ THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF VALVE.
(3) 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.
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35-21-18
ALL ú ú 01 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TO THE UPPER
DECK CABIN
MANUAL SWITCH BAR SEE A
FLOW CONTROL UNITRESET LEVER (EXAMPLE)
SEE B
ELECTRICAL
CONNECTOR
FWD
RESET SOLENOID LOCKWIRE
A
SOLENOID MOUNTING NUT LEVER FOR THE FLOW CONTROLCLEVIS UNIT
LOCKNUT
DOUBLE PIN, WASHER, LOCK-NUT AND COTTER (FACTORY PIN
SOLENOID
ADJUSTED)
B
Oxygen System Reset Solenoid Installation Figure 401
SWITCH BAR
FLOW CONTROL UNIT
C22865
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35-21-18
ALL ú ú 03 Page 402 ú Feb 10/94
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