21-43-00
 ALL  ú ú 01 Page 506 ú Jan 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 
MAINTENANCE MANUAL
 S 215-001
 (24) Use the heat source to increase the temperature at the temperature
 control switch.
 (a) Make sure the fan stops.
 S 865-043
 (25) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the
 P6 panel:
 (a) 6H5, FIRE EXTINGUISHING CARGO BTL 1
 (b) 6H6, FIRE EXTINGUISHING CARGO BTL 2
 E.  Test - Temperature Control Thermal Switch
 S 015-044
 (1) Open the Cargo Door No. 1 (AMM 06-46-00/201).
 S 015-045
 (2) Remove the endliner at the aft end of the cargo compartment.
 S 805-046
 (3) Find the thermal switch on the bulkhead immediately below the
 heating intake duct.
 ú
 ú  S 735-047
 ú  (4) Use the cooling source to decrease the temperature of the switch to
 ú  50°F (10°C) minimum.
 ú
 ú  S 885-073
 ú  (5) Make sure the heating fan operates.
 ú
 ú  S 215-048
 ú  (6) Use the heat source to increase the temperature of the switch to
 ú  70°F (21°C) maximum.
 ú
 ú  S 885-074
 ú  (7) Make sure the heating fan stops after approximately 20 seconds.
 S 415-050
 (8) Install the cargo compartment endliner.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 415-051
 (9)
Close the Cargo Door No. 1 (AMM 06-46-00/201).

 S 865-052

 (10)
 Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-43-00
 ú  ALL  ú
 ú ú  ú 01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 508Sep 28/02 

A
757 MAINTENANCE MANUAL
 FORWARD CARGO HEATING FLOW FAN - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task in the removal of the forward cargo heating flow fan. The second task is the installation of the forward cargo heating flow fan.
 B.  A forward cargo heating fan pulls the cargo compartment air through the cargo heat duct to supply heat to the cargo compartment. The fan is in the mix manifold bay area on the right side adjacent to the airplane skin.
 TASK 21-43-04-004-001
 2.  Remove the Forward Cargo Heating Flow Fan (Fig. 401)_________________________________________
 A.  References
 (1)  
06-46-00/201, Entry, Service and Cargo Doors, Access Doors and Panels

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

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

 B.  
Access

 (1)  
Location Zones 125/126 Area Aft of Forward Cargo Compartment

 C.  
Procedure

 S 864-002
 (1)  
Open this circuit breaker on the miscellaneous relay panel, P70, and attach a DO-NOT-CLOSE tag:

 (a)  
70B8, FWD CARGO FAN

 S 864-004
 (2)  
Open this circuit breaker on the overhead circuit breaker panel, P11, and attach a DO-NOT-CLOSE tag:

 (a)  
11N17, CARGO HEATER FAN FWD

 (3)  
Open the No. 1 Cargo Door (821) (Ref 06-46-00).

 S 014-006

 (4)  
To get access to the heating flow fan, remove the right bulkhead lining panel at the aft end of the forward cargo compartment (AMM 25-50-03/401).

 (5)  
　
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