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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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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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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747-400
MAINTENANCE MANUAL
S 864-003
(2) Open this circuit breaker for the applicable engine and attach a
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