S 405-107

 (9)  
AIRPLANES WITHOUT ACCESS DOOR ON THE FORWARD FAIRING; Install No. 2 and No. 3 forward fairings (AMM 54-62-04/401).

 S 865-079

 (10)
 Erase all EICAS status messages which were shown during the test (AMM 31-61-00/201).

 (11)
 Remove electrical power (AMM 24-22-00/201).

 S 865-081
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 ALL  ú ú 01 Page 513 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ENGINE INLET ANTI-ICE VALVE - REMOVAL/INSTALLATION
__________________________________________________
 1.  General_______
 A.  There are two tasks in this subject. There is one task for removal and there is one task for installation of the engine inlet thermal anti-ice (TAI) valve. The procedure has these parts:
 -Depressurization of the pneumatic system
 -Access of the TAI valve through the access door on the forward fairing of the engine strut or by removing the forward fairing
 -Removal of the valve
 -Installation of a replacement valve
 -Operational test of the valve.
 B.  The procedure is the same for each engine.
 TASK 30-21-03-004-001
 2.  Engine Inlet Anti-Ice Valve Removal (Fig. 401)___________________________________
 A.  References
 (1)  
AMM 36-00-00/201, Pneumatic System

 (2)  
AMM 54-62-04/401, Forward Fairing - Removal/Installation

 (3)  
SSM 30-21-01, SSM 30-21-02, SSM 30-21-03, SSM 30-21-04

 (4)  
WDM 30-21-11, WDM 30-21-21, WDM 30-21-31, WDM 30-21-41

 B.  Access
 (1)  
AIRPLANES WITH ACCESS DOOR ON THE FORWARD FAIRING;

 Location Zone 451 Engine 1 - Strut Forward Fairing, No. 3 Fairing 461 Engine 2 - Strut Forward Fairing, No. 3 Fairing 471 Engine 3 - Strut Forward Fairing, No. 3 Fairing 481 Engine 4 - Strut Forward Fairing, No. 3 Fairing

 (2)  
AIRPLANES WITHOUT ACCESS DOOR ON THE FORWARD FAIRING; Location Zone 451 Engine 1 - Strut Forward Fairing, No. 2 and No. 3 Fairings 461 Engine 2 - Strut Forward Fairing, No. 2 and No. 3 Fairings 471 Engine 3 - Strut Forward Fairing, No. 2 and No. 3 Fairings

 481 Engine 4 - Strut Forward Fairing, No. 2 and No. 3 Fairings
 C.  Procedure
 S 864-002
 (1)  Set the applicable NACELLE ANTI-ICE switch on the anti-ice/rain removal module (P5 panel) to the off position.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 
MAINTENANCE MANUAL 
1. V-BAND COUPLING 
VALVE POSITION 
INDICATOR 
SEE  A  2. THERMAL  3. ELECTRICAL 
ANTI-ICE  CONNECTOR 
(TAI) VALVE  A  SEE  B 
4. PRESSURE SENSE  A 
TUBE 
BONDING 
JUMPER 
STRUT FORWARD 
UPPER SPAR 
UPPER SPAR 
FITTING ASSEMBLY  6. UNION 
7. PACKING 
1.  V-BAND 
COUPLING  VALVE BODY  ASSEMBLY UPPER SPAR FITTING FLANGE SURFACE OF  A 
3. ELECTRICAL 
CONNECTOR 
5.  SEAL 
DUCT 
A-A 
4.50 
4.20 
FLANGE SURFACE OF 
UPPER SPAR FITTING 
ASSEMBLY 

B
Engine Inlet Thermal Anti-Ice 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 864-003
 (2)  Open this circuit breaker for the applicable engine and attach a
　
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