21-44-06
 ALL  ú ú 02 Page 407 ú Jan 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 AFT CARGO TEMPERATURE CONTROL SWITCH - REMOVAL/INSTALLATION
___________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the aft cargo temperature control switch. The second task is the installation of the aft cargo temperature control switch.
 B.  The aft cargo temperature control switch is on the forward wall of the aft cargo compartment on the panel behind the heating duct inlet grill. When the cargo compartment temperature is less than 50°F the control switch closes and sends a signal to the aft cargo heating fan. When the cargo compartment temperature is 70°F the control switch stops power to the aft cargo heating fan.
 TASK 21-44-07-004-001
 2.  Remove the Aft Cargo Temperature Control Switch (Fig. 401)_______________________________________________
 A.  References
 (1)  
AMM 06-46-00/201, Entry, Service and Cargo Doors, Access Doors and Panels

 B.  
Access

 (1)  
Location Zones
 153/154 Aft Cargo Compartment

 C.  
Procedure

 S 864-002
 (1)  
Open this circuit breaker on the overhead circuit breaker panel, P11, and attach a DO-NOT-CLOSE tag:

 (a)  
11N22, CARGO HEAT FAN AFT

 S 864-003
 (2)  
Open this circuit breaker on the right miscellaneous electrical equipment panel, P37, and attach a DO-NOT-CLOSE tag:

 (a)  
37C2, AFT CARGO FAN

 (3)
Open the cargo compartment door No. 2 (822) (AMM 06-46-00/201).

 S 014-005

 (4)  
Remove the right bulkhead lining panel on the forward bulkhead to get access to the control switch (AMM 25-50-03/401).

 (5)
Disconnect the electrical connector from the control switch.

 (6)  
Remove the control switch from the boss.

 S 014-004
 S 034-006
 S 024-007
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-44-07
 ALL  ú ú 02 Page 401 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
.
AFT CARGO TEMPERATURE THERMAL SWITCH
SEE A
AFT CARGOHEATING INLET DUCT (REF)
ELECTRICAL
CONNECTOR

GRILL
(REF)
TEMPERATURE
CONTROL SWITCH

WIRE FILTER (REF)
BOLT
(3 LOCATION)
(REF)

BOSS
AFT CARGO TEMPERATURE THERMAL SWITCH
A
Aft Cargo Compartment Temperature Control Switch Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-44-07
 ALL  ú ú 02 Page 402 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 TASK 21-44-07-404-008
 3.  Install the Aft Cargo Temperature Control Switch (Fig. 401)________________________________________________
 A. Equipment
 (1)  
Heating Source - hand-held blow dryer,
 commercially available

 (2)  
Cooling Source - ice pack, commercially
 available

 (3)  
Thermometer - hand-held type, commercially
 available, for ranges 40°F to 80°F

 B.
References

 (1)  
AMM 06-46-00/201, Entry, Service and Cargo Doors, Access Doors and Panels

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 (3)  
AMM 25-50-03/401, Bulkhead Lining Panels

 C.
Access

 (1)  
Location Zones
 153/154 Aft Cargo Compartment

 D.
Procedure

 S 424-009
 (1)  
Put the control switch into the boss. Tighten.

 S 434-010

 (2)  
Install the electrical connector to the control switch.
　
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