S 862-021
 (9)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P70 panel:

 (a)  
70C8, AFT CARGO HTR

 S 862-022
 (10) Supply electrical power (AMM 24-22-00/201).
 NOTE:____The fan operates automatically. A signal from the forward thermal temperature sensor switch controls the fan.
 S 712-023
 (11)
 Make sure the cargo heating flow fan operates.

 (a)  
If the fan does not operate, apply the cooling source to the cargo compartment thermal temperature switch until the fan starts.

 S 212-024
 (12)
 While the fan operates, make sure the air that comes from the heater outlets is warm.

 S 412-025

 (13)
 Close the No. 2 cargo door (822) (AMM 06-46-00/201).

 S 862-026

 (14)
 Remove electrical power, if it is not necessary.

 TASK 21-44-05-212-027
 4. Inspect the Aft Cargo Heater
____________________________
 A. Procedure
 S 022-028
 (1)  
Remove the aft cargo heater.

 S 212-029

 (2)  
Visually examine the aft cargo heater for dust, dirt, debris, and grease.

 (3)  
Visually examine the exchanger fins for dirt and debris.

 (4)  
Install the aft cargo heater.

 S 212-030
 S 422-031
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

757 MAINTENANCE MANUAL
 TASK 21-44-05-112-032
 5.  Clean the Aft Cargo Heater__________________________
 A. Consumable Materials
 (1)  
B00600 Cleaning Solvent - Isopropyl Alcohol,
 commercially available

 B.
Equipment

 (1)  
Vacuum - commercially available

 C.
Procedure

 S 022-048
 WARNING:_______BE VERY CAREFUL WHEN YOU REMOVE THE HEATER. IF THE HEATER HOUSING IS HOT, IT CAN BURN YOU.
 (1)  
Remove the aft cargo heater.

 S 162-034

 (2)  
Remove dust, lint, and debris with compressed air.

 S 112-035
 CAUTION:_______DO NOT PUT THE HEATER INTO THE CLEANING SOLVENT. DO NOT USE WATER-BASED SOLVENTS TO CLEAN THE HEATER. DAMAGE TO THE ELECTRICAL HEATING ELEMENT CAN OCCUR.
 (3)  
To remove film, apply solvent with a spray container.

 S 802-036

 (4)  
Let the air dry the aft cargo heater.

 S 422-037

 (5)  
Install the aft cargo heater.

 S 142-039

 (6)  
Clean the aft cargo heating inlet grill as follows:

 (a)  
Remove the inlet grill.

 (b)  
Vacuum the front and back side of the grill to remove all of the dirt and debris.

 (c)  
Install the inlet grill.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 02 Page 206 ú Sep 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 AFT CARGO HEATING FLOW FAN - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the aft cargo heating flow fan. The second task is the installation of the aft cargo heating flow fan.
 B.  The aft cargo heating flow fan is immediately aft of the aft cargo compartment forward partition. The fan pushes air through the cargo heating ducts.
 TASK 21-44-06-004-001
 2.  Remove the Aft Cargo Heating Flow Fan (Fig. 401)_____________________________________
 A.  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

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

 B.  
　
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