747-400
MAINTENANCE MANUAL

HEATER CONTROL
LOW MED

HIGHOFF
SEE  D 
SEE C (2 PLACES) HEATER SHOULDER  SEE  B  CREW REST AREA HEAT CONTROLLER B 

FLIGHT DECK CREW REST AREA AIR DISTRIBUTION
HEATER
DUCT  C
FLIGHT DECK CREWREST HEATER
FLIGHT DECK AIR DISTRIBUTION
D
Supplemental Heaters - Component Location Figure 1 (Sheet 2)
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A
747-400
MAINTENANCE MANUAL

115V AC
BUS 1 .B
115V AC
BUS 1 .C
115V AC
BUS 1 .B
115V AC
BUS 1 .C
P414 R985 ALT SYSPOWER DISTRIBUTION AIR/GND RELAYCENTER-LEFT

Flight Deck Supplemental Heating Schematic Figure 2
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747-400 MAINTENANCE MANUAL
 FLIGHT CREW FOOT HEATER - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of a flight crew foot heater. The procedure has these parts:
 (1)  
The removal of power to the heaters

 (2)  
The removal of a main deck ceiling panel to get access to the heater electrical connector

 (3)  
The removal of the heater

 (4)  
The installation of the heater

 (5)  
A functional test of the heater.

 TASK 21-42-01-004-001
 2.  Flight Crew Foot Heater Removal (Fig. 401)_______________________________
 A.  References
 (1)  IPC 21-41-52 Fig. 1
 B.  Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 C.  Procedure
 S 864-013
 (1)  For the captain's foot heaters, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P414 Power Distribution Center - Left 1) 414H10 AUX HEAT PWR CAPT HIGH 2) 414H11 AUX HEAT PWR CAPT LOW
 S 864-014
 (2)  For the first officer's foot heaters, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P414 Power Distribution Center - Left 1) 414H12 AUX HEAT PWR F/O HIGH
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747-400 MAINTENANCE MANUAL
 2) 414H13 AUX HEAT PWR F/O LOW
 S 024-002
 (3)  Remove the flight crew foot heater.
 (a)  
Disconnect the electrical connector in the ceiling space of the main deck cabin. 1) Captain's foot heaters, DH519-left and DH520-right. 2) First officer's foot heater, DH521-left and DH522-right.

 (b)  
Remove the 12 screws from around the foot heater and remove the foot heater. Remove the electrical connector through the hole in the floor.

 TASK 21-42-01-404-003
 3.  Flight Crew Foot Heater Installation____________________________________
 A. Consumable Materials
 (1)  Dry Ice - If the flight compartment temperature is greater than 73°F (23°C).
 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 32-09-02/201, Air/Ground Relay System

 (3)  
IPC 21-41-52 Fig. 1

 C. Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Procedure
 S 424-004
 (1)  Install the flight crew foot heater:
 (a)  
　
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