FORWARD CARGO COMPARTMENT HEATERS
SEE B
SEE A
INBOARD EXHAUST VALVE (REF)
A
CLAMPS
HEATER
CLAMPS
RUBBER
SLEEVE
ELECTRICAL CONNECTOR
RUBBERSLEEVE
B
Forward Cargo Compartment Heater Installation Figure 401
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747-400 MAINTENANCE MANUAL
 (b)  The left heater electrical connector DH525.
 S 034-006
 (4)  
Loosen the clamps on each end of the heater.

 S 024-007

 (5)  
Pull the clamps and rubber sleeves along the duct away from the heater and remove the heater.

 S 034-008

 (6)  
Put covers on the duct openings to prevent entry of unwanted objects.

 TASK 21-43-01-404-009
 3.  Forward Cargo Compartment Heater 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. References
 (1)  
21-43-00/501, Forward Cargo Heat System

 (2)  
25-53-15/401, Ball Transfer Panel

 (3)  
IPC 21-43-52 Fig. 1

 (4)  
WDM 21-43-11

 (5)  
SSM 21-43-01

 D. Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH 122 Forward Cargo Compartment Forward Half, RH
 E. Procedure
 S 434-010
 (1)  
Remove the covers from the duct openings.

 S 424-011

 (2)  
Install the heater in the duct with the flow arrow pointed aft and pull the rubber sleeves on each end of the heater.

 (3)  
Install and tighten the clamps (4 locations).

 S 434-013

 (4)  
Install the electrical connector on the heater.

 (a)  
The right heater electrical connector DH526

 (b)  
The left heater electrical connector DH525

 S 434-012
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 (5)  S 864-014Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P6 Main Power Distribution Panel 1) 6F32 FWD CARGO HEAT CONT (b) P414 Power Distribution Center-Left 1) 414J2 CARGO HTR PWR LEFT FWD (c) P415 Power Distribution Center-Right. 1) 415G18 CARGO HTR PWR RIGHT FWD
 (6)  S 714-017Do the forward cargo heat system test (Ref 21-43-00/501).
 (7)  S 864-022Set the EQUIP COOLING switch on the P5 overhead panel to the STBY position.
 (8)  S 414-019Install the ball transfer panel (Ref 25-53-15/401).

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 FORWARD CARGO COMPARTMENT TEMPERATURE SWITCH - REMOVAL/INSTALLATION
___________________________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of the forward cargo compartment temperature switch.
 B.  The temperature switch is installed adjacent to the forward cargo compartment temperature sensor, in the sensor assembly box. The sensor assembly box is on the left sidewall of the forward cargo compartment at station 650.
 TASK 21-43-03-004-001
 2.  Temperature Switch Removal (Fig. 401)__________________________
　
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