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 21-00-00
 ALL  ú ú 02 Page 6 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 AIR CONDITIONING - MAINTENANCE PRACTICES
________________________________________
 1.  General
_______
 A.  Two tasks are supplied in this procedure. The first task is to use an external source to supply conditioned air. The second task is to use the airplane packs to supply conditioned air.
 TASK 21-00-00-862-001
 2.  Use External Source To Supply Conditioned Air
_________________________________________________
 A.  General
 (1)  The airplane has a ground service connection which allows conditioned air to be applied from an external source. The ground service connection is located on the under side of the fuselage.
 NOTE: It is recommended that ground service conditioned air be used
____ when ambient air temperature is above 60 degrees farenheit.
 B.  References
 (1)  
12-31-01/201, Zone Diagrams

 (2)  
12-31-21/201, Body Section 43 Access Doors and Panels

 (3)  
24-22-00/201, Manual Control

 C.  Access
 (1)  
Location Zone (Ref 12-31-01/201)

 (a)  200, Lower Half Of Fuselage

 (2)  
Access Panel (Ref 12-31-21/201)

 (a)  1304 - Ground Conditioning Air Door
 D.  Procedure
 S 492-002
 (1)  Connect the external conditioned air source:
 (a)  
Open this access door, 1304 (Ref 12-31-21/201).

 (b)  
Attach the external conditioned air supply hose to the ground service conditioned air supply flange.

 (c)  
Turn the conditioned air supply hose connector to lock it in position.

 S 862-003
 WARNING: INADVERTANT AIRPLANE PRESSURIZATION CAN CAUSE PERSONNEL INJURY
_______
 OR EQUIPMENT DAMAGE.

 (2)  If a control cabin window or an entry door cannot be left open because of weather conditions, etc., do these steps:
 (a)  
Supply electrical power to the airplane (Ref 24-22-00/201).

 (b)  
Set the pressurization MODE SELECTOR switch on the P5-6 Pressurization Control Panel to MAN AC or MAN DC.

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 ALL  ú ú 01 Page 201 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (c)  Use the toggle switch on the P5-6 Pressurization Control Module to manually open the outflow valve.
 NOTE: Look at the indicator on the P5-6 Pressurization
____ Control Panel for the outflow valve position.
 S 862-004
 (3)
Supply conditioned air from the external source to the airplane.

 S 092-005

 (4)  
Remove the external conditioned air source:

 (a)  
Stop the external conditioned air source.

 (b)  
Rotate the conditioned air supply hose connctor to unlock the connector from the groud service connection flange.

 (c)  
Remove the conditioned air supply hose.

 (d)  
Close the open access panel, 1304 (Ref 12-31-21/201).

 (e)  
Remove the electrical power from the airplane if it is no longer necessary (Ref 24-22-00/201).

 

 TASK 21-00-00-862-006
 3. Airplane Air-Conditioning Packs To Supply Conditioned Air
_________________________________________________________
 A. General
 (1)  Two air-conditioning packs are used to supply heated or cooled air to the airplane. The two air-conditioning packs operate the same. Only one of the air-conditioning packs is described below.
 B. References
 (1)  
24-22-00/201, Manual Control

 (2)  
36-05-00/201, Pneumatic System

 C. Procedure
 S 282-023
 CAUTION: DO NOT OPERATE AN AIR CONDITIONING PACK AND A GROUND
　
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