S 865-024

 (3)  
AIRPLANES SIMULATING AIR CONDITIONING PACK OPERATION; Select all three Pack Selector Switches, on the pilot's P5 overhead panel, to NORM.

 NOTE:  This will not cause pack operation if the airplane is depressurized.
 S 865-022
 (4)  
AIRPLANES SIMULATING AIR CONDITIONING PACK OPERATION; Disconnect the flow control valve connectors: DV93, DV94, DV95. (AMM 21-51-01/401)

 S 865-020

 (5)  
AIRPLANES OPERATING ALL THREE AIR CONDITIONING PACKS; Operate all three air conditioning packs (AMM 21-00-00/201)

 S 865-021

 (6)  
Put the LOWER LOBE CARGO COND FLOW RATE selector on the P461 overhead panel to OFF.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 215-023
 (7)  Look at the EICAS maintenance page for the air conditioning system to see the position of the flight deck flow regulating valve (F/D FRV).
 (a)  Make sure the valve is at an intermediate position,
 approximately 0.40

 S 865-016
 WARNING: MAKE SURE THE CIRCUIT BREAKER IN THE NEXT STEP IS OPENED.
_______ IF IT IS NOT OPENED, THE FIRE EXTINGUISHER BOTTLES COULD RELEASE THEIR CONTENTS AND CAUSE INJURY TO PERSONNEL.
 (8)  Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag:
 (a)  6H6, FIRE EXTINGUISHER LOWER CARGO
 S 735-012
 (9)  Do these steps to make sure the cargo fire control system operates correctly:
 (a)  
Put the MAIN DECK cargo fire switch on the P5 panel to ARMED.

 (b)  
Make sure the valve goes to the fully open position.
 Approximately 1.00 on EICAS.

 (c)  
Put the MAIN DECK cargo fire switch to the unarmed position.

 (d)  
Make sure the valve returns to an intermediate position.

 (e)  
Put the FWD cargo fire switch on the P5 panel to ARMED.

 (f)  
Make sure the valve goes to the fully open position.
 Approximately 1.00 on EICAS.

 (g)  
Put the FWD cargo fire switch to the unarmed position.

 (h)  
Make sure the valve returns to an intermediate position.

 (i)  
Put the AFT cargo fire switch on the P5 panel to ARMED.

 (j)  
Make sure the valve goes to the fully open position.
 Approximately 1.00 on EICAS.

 (k)  
Put the AFT cargo fire switch to the unarmed position.

 (l)  
Make sure the valve returns to an intermediate position.

 S 865-013
 (10) Remove the DO-NOT-CLOSE tag and close this circuit breaker on the main power distribution panel, P6:
 (a)  6H6, FIRE EXTINGUISHER LOWER CARGO
 S 865-018
 (11) AIRPLANES OPERATING ALL THREE AIR CONDITIONING PACKS; Turn off the air conditioning packs, if they are not necessary. (AMM 21-00-00/201)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 865-026
 (12)
 AIRPLANES SIMULATING AIR CONDITIONING PACK OPERATION; Reconnect the flow control valve connectors: DV93, DV94, DV95. (AMM 21-51-01/401)

 S 865-027

 (13)
 AIRPLANES SIMULATING AIR CONDITIONING PACK OPERATION; Select all three Pack Selector Switches, on the pilot's P5 overhead panel, to OFF.

 S 865-014

 (14)
 Remove the electrical power if it is not necessary (AMM 24-22-00/201).

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