(c)  
Apply the leak detector to the pneumatic tube fittings.

 (d)  
Supply pressure to the pneumatic system (AMM 36-00-00/201).

 (e)  
Put the applicable HYD DEMAND switch on the P5 panel in the ON position.

 (f)  
Examine the tube fittings for leakage.

 (g)  
If you find leakage, repair the cause of it.

 (h)  
Put the HYD DEMAND switch in the OFF position.

 (i)  
Release the pressure in the pneumatic system
 (AMM 36-00-00/201).

 (j)  
Remove the ADP muffler.

 S 414-032
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (5)  
Close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).

 S 864-033

 (6)  
Remove electrical power if it is not necessary for other operations (AMM 24-22-00/201).

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 ALL  ú ú 01 Page 407 ú Feb 18/02
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A
747-400 MAINTENANCE MANUAL
 PNEUMATIC SOLENOID VALVE PACK - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  The pneumatic solenoid valve pack can be removed independently. This procedure removes/installs a pneumatic solenoid valve pack. See Fig. 401.
 TASK 29-11-26-024-001
 2.  Pneumatic Solenoid Valve Pack Removal (Fig. 401)_____________________________________
 A.  References
 (1)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (2)  
AMM 36-00-00/201, Pneumatic System

 (3)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (4)  
IPC 29-11-41, Fig. 1

 B.  
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel 454A Trailing Edge Fairing Door, LH - System 1 484A Trailing Edge Fairing Door, LH - System 4

 C.  
Procedure

 S 864-018
 (1)  
On the P5 panel, position the HYD DEMAND PUMPS switch to the OFF position

 S 014-019

 (2)  
Open the left fairing door on the trailing edge of the strut (AMM 54-62-00/201).

 S 864-017
 WARNING: MAKE SURE YOU RELEASE THE PNEUMATIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. THE PNEUMATIC SYSTEM PRESSURIZES THE HYDRAULIC RESERVOIR. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (3)
Release the pressure in the pneumatic system (AMM 36-00-00/201).

 (4)
Release the pressure in the hydraulic system (AMM 29-11-00/201).

 S 864-012

 (5)  
Open this circuit breaker for the applicable system:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7J1 HYDRAULICS DEMAND 1
 2) 7F1 HYDRAULICS DEMAND 4

 S 864-013
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 29-11-26
 ALL  ú ú 01 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE A
ELECTRICAL 
CONNECTORS 
MOUNTING SCREW
(3 LOCATIONS) 
TURBINE DRIVE 
GEARBOX 
CONTROL AIR  PNEUMATIC 
PRESSURE  SOLENOID 
LINES  VALVE 
PACK 
(VIEW IN THE FORWARD DIRECTION) 
A 

Pneumatic Solenoid Valve Pack Installation
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-26
 ALL  ú ú 01 Page 402 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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