(b)  
With the override valve in the OPEN position, do a check for air leakage from around the valve to duct joints. 1) Light leakage is permitted. 2) If the leakage is strong, align the joints and tighten the

 clamps.
 S 794-027
 (11) Do a leak test of the control valve.
 (a)  
Set the CARGO HEAT switch (installed immediately forward of the bulk cargo door) to the 65°F (20°C) position.

 (b)  
If the temperature in the compartment is more than 65°F (18°C), then do these steps: 1) Remove the cover plate from the sensor assembly box in the

 bulk cargo compartment.
 NOTE: The coverplate is on the left sidewall of the bulk
____ cargo compartment at station 2010.
 2)  Apply the cooling source to the high temperature switch to decrease the temperature of the switch to less than 65°F (20°C).
 NOTE: The high temperature switch is on the right side of
____
 the sensor assembly box.

 3)  If the temperature in the compartment is more than 90°F (32°C), apply the cooling source to the overheat switch also.
 NOTE: The overheat switch is on the left side of the
____
 sensor assembly box.

 (c)  
With the control valve in the OPEN position, do a check for air leakage from the valve to duct joints. 1) Light leakage is permitted. 2) If the leakage is strong, align the joints and tighten the

 clamps.

 (d)  
If it is applicable, remove the cooling source from the sensor assembly box.

 (e)  
If removed, install the coverplate on the sensor assembly box.

 S 864-028
 (12)
 Set the AFT CARGO HT switch on the P5 overhead panel to off.

 (13)
 Release the pressure in the pneumatic system (AMM 36-00-00/201).

 S 864-029
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747-400 MAINTENANCE MANUAL
 S 864-030
 (14)
 Remove electrical power (AMM 24-22-00/201). S 944-033

 LANDING GEAR DOOR LOCK INSTALLATION PROCEDURE.

 (15)
 Remove the body and the wing gear door locks (AMM 32-00-30/201).

 WARNING:_______ MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE DOOR
 OPERATION AREA.  FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO
 PERSONS OR DAMAGE TO EQUIPMENT.  REFER TO AMM 32-00-30/201 FOR

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747-400 MAINTENANCE MANUAL
 AFT CARGO TEMPERATURE CONTROL SWITCH - REMOVAL/INSTALLATION
___________________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task removes the low temperature and the high temperature control switch for the aft cargo compartment. The second task installs the low temperature and the high temperature control switch for the aft cargo compartment.
 B.  The temperature control switches for the aft cargo compartment are found in the temperature sensor assembly for the bulk cargo compartment.
 NOTE: The temperature sensor assembly for the bulk cargo compartment
____ is found on the left sidewall of the bulk cargo compartment.
 TASK 21-44-02-004-001
 2.  Remove the Temperature Control Switch (Fig. 401)
_____________________________________
 A.  References
 (1)  
IPC 21-43-03 Fig. 1

 (2)  
WDM 21-44-11, 21-44-12

 (3)  
SSM 21-44-01

 B.  Access
 (1)  Location Zone
 145 Bulk Cargo Compartment, LH

 C.  Procedure
　
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