(2)  
WDM 21-43-11

 (3)  
SSM 21-43-01

 B.  Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH
 C.  Procedure
 S 864-002
 (1)  Open the following circuit breaker for the forward cargo compartment temperature switch and attach a DO-NOT-CLOSE tag:
 (a)  On the P6 Main Power Distribution Panel 1) 6F32 FWD CARGO HEAT CONT
 S 014-003
 (2)  
Remove the coverplate screws and the coverplate from the sensor assembly box.

 S 034-004

 (3)  
Remove the electrical connector DS2014 from the temperature switch.

 S 024-005

 (4)  
Remove the nut from the switch and remove the switch from the mounting plate.

 TASK 21-43-03-404-006
 3.  Temperature Switch Installation_______________________________
 A.  Special Tools and Equipment
 (1)  G21001-11, Lockout Assembly - N2 Speed Card Test Switch
 B.  Standard Tools and Equipment
 (1)  Cooling Source (Ice pack or equivalent)
 C.  Consumable Materials
 (1)  
A00968 Primer DC1204

 (2)  
A00971 Sealant DC3145

 D.  References
 (1)  20-11-28/401, Lockwire
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A
747-400
MAINTENANCE MANUAL

A
SENSOR

FORWARD CARGO COMPARTMENT
TEMPERATURE SENSOR ASSEMBLY

SWITCH
LOCKWIRE

NUT

Forward Cargo Compartment Temperature Switch Installation
Figure 401

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A
747-400
MAINTENANCE MANUAL

 (2)  
21-43-00/501, Forward Cargo Heat System

 (3)  
IPC 21-43-03 Fig. 1

 (4)  
WDM 21-43-11

 (5)  
SSM 21-43-01

 E. Access
 (1)  Location Zone
 121 Forward Cargo Compartment Forward Half, LH

 F. Procedure
 S 424-007
 (1)  
Install the temperature switch with the electrical receptacle on the top of the mounting plate and install the nut.

 S 434-008

 (2)
Install the lockwire between the switch and nut (Ref 20-11-28/401).

 S 394-011

 (3)  
Apply the primer to the lockwire access hole.

 S 394-017

 (4)  
Apply the sealant to the lockwire access hole.

 S 434-012

 (5)  
Install the electrical connector DS2014 on the switch.

 S 864-013

 (6)  
Remove the DO-NOT-CLOSE tag and close the following circuit breaker for the forward cargo compartment temperature switch:

 (a)  On the P6 Main Power Distribution Panel
 1) 6F32 FWD CARGO HEAT CONT

 (7)  
Do the forward cargo heat system test (Ref 21-43-00/501).

 S 714-015
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A
747-400 MAINTENANCE MANUAL
 FORWARD CARGO HEAT DUCT - REPAIR
________________________________
 1.  General_______
 A.  This task gives instructions to repair the heat duct in the forward cargo compartment.
 B.  This task has two procedures for the repair of the heat duct while it is on the airplane:
 (1)  
The first procedure tells to repair a short section of the heat duct. A short segment of duct is twelve inches (305 mm) or less.
　
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