21-58-06
ALL ú ú 01A Page 404 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SKIN TEMPERATURE SWITCH - REMOVAL/INSTALLATION
______________________________________________
1. General
_______
A. This procedure has instructions to remove and install the skin temperature switch for the equipment cooling system. The switch is installed on the airplane skin, below the floor of the forward cargo compartment at station 530, left of the center line.
TASK 21-58-07-004-001
2. Skin Temperature Switch Removal (Fig. 401)
_______________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
IPC 21-58-07 Fig. 1
(3)
WDM 21-58-14
(4)
SSM 21-58-03
B. Access
(1) Location Zone 121 Forward Cargo Compartment Forward Half, LH
C. Prepare for the Removal
S 864-002
CAUTION: DO NOT OPERATE THE ELECTRICAL/ELECTRONIC EQUIPMENT WHEN YOU DO
_______ THIS PROCEDURE. IF YOU OPERATE THE ELECTRICAL EQUIPMENT WHEN THE EQUIPMENT COOLING SYSTEM IS OFF, YOU CAN CAUSE THE ELECTRICAL EQUIPMENT TO BECOME TOO HOT.
(1) Remove the electrical power (Ref 24-22-00/201).
D. Remove the Switch
S 034-003
(1)
Disconnect the electrical connector, DS1888, from the switch.
(2)
Cut and remove the lockwire from the switch.
S 034-020
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21-58-07
ALL ú ú 03 Page 401 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
A-A
Equipment Cooling Skin Temperature Switch Installation Figure 401
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21-58-07
ALL ú ú 01 Page 402 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 024-004
(3) Remove the switch.
TASK 21-58-07-404-005
3. Skin Temperature Switch Installation (Fig. 401)
____________________________________
A. Consumable Materials
(1) A00062 Sealant - DC340
B. References
(1)
20-11-28/401 - Lockwire
(2)
24-22-00/201, Manual Control
(3)
IPC 21-58-07 Fig. 1
(4)
WDM 21-58-14
(5)
SSM 21-58-03
C. Access
(1) Location Zone 121 Forward Cargo Compartment Forward Half, LH
D. Install the Switch
S 394-006
(1)
Apply a layer of the sealant above the hole in the boss.
S 434-021
(2)
Put a new O-ring on the switch.
S 424-007
(3)
Install the switch.
(a) Make sure the sealant comes out of the hole when you install the switch.
S 434-008
(4)
Install a lockwire on the switch (Ref 20-11-28/401).
S 434-009
(5)
Connect the electrical connector, DS1888, to the switch.
E. Do the Installation Test for the Switch
NOTE: Do this test when the ambient temperature is more
____
than 45°F (7°C).
S 824-010
(1) From the outer side of the airplane, turn the manual drive collar of the overboard exhaust valve until the valve is closed (Ref 21-58-12/401).
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