(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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
36-11-14
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
36-11-14
ALL ú ú 03 Page 402 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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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