C. Procedure
 S 424-009
 (1)  Install the flight crew shoulder heater (Fig. 401).
 (a)  
Install the heater with the flow arrow pointed forward and install the support clamps.

 (b)  
Push the ducts on each end of the heater and install the clamps.

 S 434-039
 (2)  Install the electrical connector on the heater.
 (a)  
The captain's shoulder heater electrical connector DH523

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

 S 864-038
 (3)  For the captain's heater, remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P414 Power Distribution Center - Left
 1) 414H10 AUX HEAT PWR CAPT HIGH
 2) 414H11 AUX HEAT PWR CAPT LOW

 S 864-037
 (4)  For the first officer's heater, remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P414 Power Distribution Center - Left.
 1) 414H12 AUX HEAT PWR F/O HIGH

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 2)  414H13 AUX HEAT PWR F/O LOW
 (5)  S 864-010Apply electrical power (AMM 24-22-00/201).
 (6)  S 864-011Supply conditioned air to the airplane by a ground cart or by operation of the air conditioning packs (AMM 21-00-00/201).
 S 844-040

 WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE SPECIFIED TASK TO
_______ PREPARE THE SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (7)  
Do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task (AMM 32-09-02/201).

 S 864-095

 (8)  
Put the airplane in the AIR mode. (AMM 32-09-02/201).

 S 714-012

 (9)  
Do a test of the flight crew shoulder heater.

 (a)  
Set the applicable SHOULDER HEATERS switch to HI.

 (b)  
Make sure the heater is on.

 1)  Feel for an increase in the temperature of the air that comes from the shoulder vents, or feel the duct immediately dowmstream of the heater.
 2)  Set the applicable SHOULDER HEATERS switch to OFF.
 S 844-042
 (10) Do the "Put Safety-Sensitive Systems back to the Condition Before Air Mode Simulation" task (AMM 32-09-02/201).
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 S 864-013
 (11)
 Remove the conditioned air (Ref 21-00-00/201).

 S 414-014

 (12)
 If removed, install the sidewall lining in the flight compartment.

 S 414-036

 (13)
 If removed, install the lavatory (AMM 25-40-03/401).

 S 864-018

 (14)
 Remove electrical power (AMM 24-22-00/201).

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MAINTENANCE MANUAL

 CAPTAIN AND FIRST OFFICERS HEATER CONTROL MODULE - REMOVAL/INSTALLATION
_______________________________________________________________________
 1.  General
_______
 A.  The procedures that follow give instructions to remove and install the heater control module for the captain and the first officer.
　
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