(2)  
Get access to the heater

 (3)  
The removal of the heater

 (4)  
The installation of the heater

 (5)  
An operational test of the heater.

 TASK 21-42-02-004-001
 2.  Flight Crew Shoulder Heater Removal (Fig. 401)
___________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-19-04/401, Flight Deck Crew Rest Lining

 (3)  
AMM 25-40-03/401, Upper Deck Lavatories

 (4)  
AIPC 21-22-51 Fig. 1

 (5)  
SSM 21-45-05

 (6)  
WDM 21-45-31

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

 C.  Prepare for the Removal
 NOTE: The flight crew shoulder heaters are installed at floor level,
____ immediately inboard of the fuselage, at Station 390 [20 inches (50 cm) aft of the escape hatch centerline].
 S 014-029
 (1)  For the captain's shoulder heater, remove the flight compartment crew rest sidewall lining to get access to the heater (AMM 25-19-04/401).
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747-400
MAINTENANCE MANUAL

(2 LOCATIONS)
LEFT HEATER (EXAMPLE)

Flight Crew Shoulder Heater Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 S 014-035
 (2)  For the first officer's shoulder heater, remove the forward right upper deck lavatory (AMM 25-40-03/401).
 D. Heater Removal
 S 864-024
 (1)  For the captain's shoulder heater, 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 864-025
 (2) For the first officer's heater, open these circuit breakers
 (a)  P414 Power Distribution Center - Left. 1) 414H12 AUX HEAT PWR F/O HIGH 2) 414H13 AUX HEAT PWR F/O LOW
 S 034-026
 (3)  Remove the electrical connector from the heater:
 (a)  
The captain's shoulder heater electrical connector DH523

 (b)  
The first officer's shoulder heater electrical connector DH524.

 S 034-027
 (4)  
Loosen the clamps at each end of the heater and pull the ducts from the heater.

 S 024-028

 (5)  
Remove the support clamps and remove the heater.

 TASK 21-42-02-404-008
 3. Flight Crew Shoulder Heater Installation
________________________________________
 A. References
 (1)  AMM 21-00-00/201, Air Conditioning
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A
747-400
MAINTENANCE MANUAL

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

 (3)  
AMM 25-19-04/401, Flight Deck Crew Rest Lining

 (4)  
AMM 25-28-01/201, Overhead Stowage Bins

 (5)  
AMM 25-40-03/401, Upper Deck Lavatories

 (6)  
AMM 32-09-02/201, Air/Ground Relay System

 (7)  
AMM 35-11-18/401, Mask/Regulator/Stowage Box

 (8)  
AIPC 21-22-51 Fig. 1

 (9)  
SSM 21-45-05

 (10)
 WDM 21-45-31

　
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