S 865-005
 (3)  
Make sure this circuit breaker on the right miscellaneous electrical equipment panel, P37, is closed:

 (a)  
37C2, AFT CARGO FAN

 S 865-006
 (4)  
Supply electrical power (Ref 24-22-00).

 S 015-007

 (5)  
Open the left cargo compartment door 822 (Ref 06-46-00) and find the aft cargo heater, fan, and temperature control switch.

 S 885-105

 (6)  
If the aft cargo fan is not in operation, do these steps to make the fan operate:

 (a)  
Decrease the temperature of the temperature control switch with the cooling source until the aft cargo fan operates.

 (b)  
Remove the cooling source.

 (c)  
Make sure air goes into the inlet grille.

 S 865-009
 (7)  
Push the AFT CARGO FIRE switch-light on the aft pilot's control stand, P8, to the ARMED position (ARMED light on).

 S 215-011

 (8)  
Make sure the fan and heater do not operate.

 S 865-014

 (9)  
Push the AFT CARGO FIRE switch-light on the P8 stand to the usual position (ARMED light off).

 S 215-106

 (10)
 Make sure the fan starts.

 S 215-108
 WARNING:_______DO NOT PUT YOUR HAND CLOSE TO THE FAN. FEEL FOR AIR MOVEMENT AT THE NOZZLES. IF YOUR HAND TOUCHES THE FAN BLADES, IT WILL CAUSE INJURY.
 (11)
 Make sure the air goes in the correct direction into the inlet grille.

 (12)
 Make sure warm air comes out of each vent nozzle.

 (13)
 Close the aft cargo compartment door, 822.

 S 215-018
 S 415-020
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 865-021
 (14)
 Remove electric power, if it is not necessary.

 S 715-113

 (15)
 Do the task: Aft Cargo Heater Operational Check.

 TASK 21-44-00-715-111
 3.  Aft Cargo Heater Operational Check (Fig. 501)__________________________________
 A. Equipment
 (1)  
Cooling source - ice pack - commercially
 available.

 (2)  
Thermometer, 0 to 100°F (0 to 49°C),
 commercially available.

 B.
References

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

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

 C.
Access

 (1)  
Location Zone
 822 Left Cargo Compartment Door

 D.
Procedure

 S 865-022
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 015-023

 (2)  
Open the No. 2 Cargo Door (AMM 06-46-00/201).

 S 805-024

 (3)  
Find the temperature control switch behind the aft cargo heating intake grill on the forward partition.

 S 885-025

 (4)  
Use the ice pack to decrease the temperature of the temperature control switch to 50°F (10°C) minimum.

 (5)  
Make sure air goes into the heating intake.

 S 215-026
 S 215-109
 WARNING:_______DO NOT PUT YOUR HAND CLOSE TO THE FAN. FEEL FOR AIR MOVEMENT AT THE NOZZLES. IF YOUR HAND TOUCHES THE FAN BLADES, IT WILL CAUSE INJURY.
 (6)  
Make sure warm air comes out of the heating vent nozzles.

 (7)  
Remove the ice pack.

 S 885-028
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-44-00
 ALL  ú ú 01 Page 504 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 415-029
 (8)  
Close the No. 2 Cargo Door.

 S 865-030

 (9)  
Remove electrical power, if it is not necessary.

 TASK 21-44-00-735-031
　
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