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 B.  The heater control modules are found in the flight deck outboard of the captains seat and the first officers seat.
 C.  The modules contain the control switches for the windshield air, shoulder heater and foot heaters.
 TASK 21-42-05-004-011
 2.  Remove the Heater Control Module (Fig. 401)
________________________________
 A.  References
 (1)  
AIPC 21-45-00 Fig. 1 and/or AIPC 21-45-00 Fig. 5

 (2)  
SSM 21-22-01, SSM 21-45-05

 (3)  
WDM 21-22-11, WDM 21-45-31

 B.  Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 C.  Procedure
 S 864-013
 (1)  Open this circuit breaker on the DC power distribution panel, P180, and attach a DO-NOT-CLOSE tag:
 (a)  180H25, WSHD AIR
 S 034-003
 (2)  
Remove the fasteners that attach the module to the panel.

 S 024-015

 (3)  
Pull the module from the panel.

 S 034-004

 (4)  
Remove the electrical connector from the heater control module for the captain (M7375) or the first officer (M7376).

 TASK 21-42-05-404-012
 3.  Install the Heater Control Module
_________________________________
 A.  References
 (1)  
AIPC 21-45-00 Fig. 1 and/or AIPC 21-45-00 Fig. 5

 (2)  
SSM 21-22-01, SSM 21-45-05

 (3)  
WDM 21-22-11, WDM 21-45-31

 B.  Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

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 21-42-05
 ALL  ú ú 02 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 

FLIGHT DECK CONTROL PANEL

SCREW
HEATERS
(4 PLACES)
WSHLD AIR SHOULDER FOOT ON HI

LO
OFF
OFF

HEATER CONTROL MODULE

Captain and First Officers Heater Control Module - Installation
Figure 401

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 ALL  ú
 ú  01  Page 402
 ú  Feb 10/90 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 434-005
 (1)  
Install the electrical connector on the heater control module for the captain (M7375) or the first officer (M7376).

 S 424-006

 (2)  
Install the heater control module into the panel.

 S 864-002

 (3)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the DC power distribution panel, P180:

 (a)  180H25, WSHD AIR
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 21-42-05
 ALL  ú ú 01 Page 403 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

4.

A
747-400 MAINTENANCE MANUAL
 FORWARD CARGO COMPARTMENT HEATING - DESCRIPTION AND OPERATION
_____________________________________________________________
General (Fig. 1)
_______
 A.  Perforated ducts in the forward cargo compartment floor area receive air from the equipment cooling system to provide heat for the forward cargo compartment. In addition, supplemental air heaters are installed in the heat ducts to ensure compartment temperature does not fall below 40°F (4°C).
 B.  The heating ducts receive air warmed by passage through the equipment cooling system. The hole pattern in the ducts allows warm air to spray out the sides of the ducts. Flow of air from the equipment cooling system into the forward cargo compartment heating duct is controlled by the equipment cooling system (Ref 21-58-00).
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 空調(diào) AIR CONDITIONING 1(145)