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 I.  The aft equipment racks are cooled by an aft equipment cooling system which consists of two fans which exhaust hot air from the aft equipment into the bulk cargo compartment and out through the pressurization outflow valves.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 AIR CONDITIONING - MAINTENANCE PRACTICES
________________________________________
 1.  General_______
 A. This procedure contains the following tasks:
 (1)  
Supply Conditioned Air to the Airplane

 (2)  
Remove Conditioned Air from the Airplane

 (3)  
Supply Conditioned Air with a Ground Air Source

 (4)  
Remove Conditioned Air Supplied by a Ground Air Source

 (5)  
Supply Conditioned Air with a Cooling Pack

 (6)  
Remove Conditioned Air Supplied by a Cooling Pack.

 TASK 21-00-00-862-042
 2.  Supply Conditioned Air to the Airplane______________________________________
 A. General
 (1)  
Conditioned air can be supplied by a ground air source or by the cooling packs.

 (2)  
A ground air source can be used to supply conditioned air directly to the airplane. It is not necessary to operate a cooling pack or to supply electric or pneumatic power when conditioned air is supplied with a ground air source.

 (3)  
It is recommended that the conditioned air to cool the airplane on the ground be supplied from a ground air source, when practical, as an alternative to operating the cooling packs (SL 747-21-082).

 B. References
 (1)  
AMM 21-00-00/201, Air Conditioning

 (2)  
SL 747-21-082, Use of Ground Source Conditioned Air in Lieu of Airplane ECS Air Conditioning Packs.

 C. Procedure
 S 862-043
 (1) Do one of these tasks to supply conditioned air to the airplane:
 NOTE: It is recommended that the conditioned air to cool the
____ airplane on the ground be supplied from a ground air source, when practical, as an alternative to operating the cooling packs (SL 747-21-082).
 (a)  Do this task: Supply Conditioned Air with a Ground Air Source (AMM 21-00-00/201).
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A
747-400
MAINTENANCE MANUAL

PACK 1 
GROUND 
SERVICE 
CONNECTOR 
SEE  B 
AIR CONDITIONING 
EQUIPMENT BAY 
SEE  A 

PACK 3 GROUND FROM WATER
SERVICE SEPARATOR
CONNECTOR FWD SEE B
AIR CONDITIONING EQUIPMENT BAY
A
GROUND
SERVICE
CONNECTOR

TO CONDITIONED
AIR PLENUM
SWING
CHECK
VALVE

GROUND SERVICE CONNECTOR
(PACK 1 SHOWN, PACK 3 IS EQUIVALENT)

B
Air Conditioning - Maintenance Practices
Figure 201 (Sheet 1)

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L83800
A

747-400 MAINTENANCE MANUAL
PILOT'S OVERHEAD PANEL, P5
FAN FLT TEMP FWD MAIN AFT DECK AUTO AUTO DECK AUTO TEMP
ON
CW
MAN
CW CW
MAN MAN CABIN TEMPERATURE
FWD LOWER AFT CONTROL MODULE ZONE RST TRIM AIR
AUTO LOBE AUTO TEMP ON
SYS FAULTa
CW CW EQUIP COOLING
MAN MAN
NORM
HI FLOW PACK RST  AFT CARGO HT STBY OVRD
ON
ON
SYS TEMPFAULTa
a
1 PACKS 2 PACKS 3
NORM NORM NORM OFF
A A
A B
OFF OFF
B B
L ISLN
　
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