(2)
24-22-00/201, Manual Control

 (3)
36-00-00/201, Pneumatic System

 B.  
Access

 (1)  
Location Zone 193 Fairing, Wing To Body, Aft Lower Half, LH

 (2)  
Access Panels
 191ML Panel - Access - Air Conditioning
 193AL Door - Ground - Pneumatic Air

 C.  
Prepare to Remove the Check Valve

 S 864-006
 WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC DUCT BEFORE YOU
_______ REMOVE A PNEUMATIC SYSTEM COMPONENT. IF YOU DO NOT RELEASE THE PRESSURE FIRST, HOT HIGH PRESSURE AIR CAN CAUSE INJURIES TO PERSONS.
 (1)
Release the pressure in the pneumatic system (Ref 36-00-00/201).

 (2)
Put the APU bleed air switch to the CLOSED position.

 S 864-005
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 ALL  ú ú 02 Page 401 ú Jun 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PNEUMATIC
GROUND AIR
CONNECTORS

SEE A
FWD
INBD
GROUND AIR CONNECTORS (2 LOCATIONS)
SEE B
GASKET PNEUMATIC GROUND AIR CONNECTORS
CHECK
VALVE  A
O-RING CHECK
BOLT
VALVE
WASHER GASKET NUT
FLANGE
CONNECTOR BOLT WASHER
1
NUT
GROUND AIR CONNECTOR
CONNECTOR
B
2
1
CONNECTOR WITH FLANGE 2
CONNECTOR WITHOUT FLANGE
Pneumatic Ground Connection Check Valve Installation
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-007
 (3)  
Open the access door 193AL (AMM 06-09-03/201).

 D.
Remove the Check Valve

 S 034-008
 (1)  AIRPLANES WITH 9036-5-2 CHECK VALVES;
 Do the steps that follow:

 NOTE:____The 9036-5-2 check valve does not have a flange. The flange is a separate part. See flagnote 1 (Figure 401) for the 9036-5-2 check valve.
 (a)  
Remove the lockwire from the housing of the check valve.

 (b)  
Turn the valve housing counterclockwise.

 (c)  
Remove the check valve.

 S 034-023
 (2)  
AIRPLANES WITHOUT 9036-5-2 CHECK VALVES;
 Do the steps that follow:

 (a)  
Open the access panel 191ML (AMM 06-09-03/201).

 (b)  
Remove the nuts and washers from the bolts.

 (c)  
Remove the check valve.

 S 034-010
 (3) Put a cover on the open duct to keep out unwanted material.
 TASK 36-11-14-404-011
 3.  Install the Check Valve for the Pneumatic Ground Connection (Fig. 401)___________________________________________________________
 A. Equipment
 (1)  
AIRPLANES WITH 9036-5-2 CHECK VALVES;
 MIT65B07911, Wrench - Ground Start Valve

 B.
References

 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
24-22-00/201, Manual Control

 (3)  
36-00-00/201, Pneumatic System

 C.
Access

 (1)  
Location Zone 193 Fairing, Wing To Body, Aft Lower Half, LH

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 36-11-14
 ALL  ú ú 01 Page 403 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  Access Panels
 191ML Panel - Access - Air Conditioning
 193AL Door - Ground - Pneumatic Air
　
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