(b)  
Attach the heater to the mounting brackets with the 12 screws.

 (c)  
Connect the electrical connector in the ceiling space of the main deck cabin. 1) Captain's foot heaters, DH519-left and DH520-right.

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747-400
MAINTENANCE MANUAL

Flight Crew Foot Heater Installation
Figure 401

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 2)  First officer's foot heater, DH521-left and DH522-right.
 (2)  S 864-016For the captain's foot heaters, 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
 (3)  S 864-017For the first officer's foot heaters, 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 2) 414H13 AUX HEAT PWR F/O LOW
 (4)  S 864-005Apply electrical power (AMM 24-22-00/201).
 S 844-018

 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.
 (5)  
Do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task (AMM 32-09-02/201).

 S 864-024

 (6)  
Put the airplane in the AIR mode (AMM 32-09-02/201).

 S 864-020

 (7)  
Close the following circuit breaker for the flight crew foot heater:

 (a)  On the P7 Overhead Circuit Breaker Panel 1) 7F23 LANDING GEAR DSP & CONT ALTN
 S 714-006
 (8)  Do a test of the flight crew foot heaters.
 (a)  
If the temperature in the flight compartment is greater than 73°F (23°C), apply dry ice to the foot heater.

 (b)  
Set the applicable FOOT HEATERS switch to the HI position.

 (c)  
Make sure the heater becomes warm.

 (d)  
Set the applicable FOOT HEATERS switch to OFF.

 S 864-022
 (9)  Open the following circuit breaker for the flight crew foot heater:
 (a)  On the P7 Overhead Circuit Breaker Panel 1) 7F23 LANDING GEAR DSP & CONT ALTN
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 S 844-019
 (10)
 Do the "Put Safety-Sensitive Systems back to the Condition Before Air Mode Simulation" task (AMM 32-09-02/201).

 S 864-008

 (11)
 Remove electrical power (AMM 24-22-00/201).

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 FLIGHT CREW SHOULDER 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 shoulder heater. The procedure includes these steps:
　
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