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A
747-400
FAULT ISOLATION/MAINT MANUAL
ANTI-ICE/RAIN REMOVAL MODULE, M7321
P5 PANEL SEE A
P6 PANEL
FLIGHT COMPARTMENT
PNEUMATIC MANIFOLD (REF)
LEFT OR RIGHT WING TAI VALVE, V152 OR V153
LEADING EDGE FLAP NO. 6 (LEFT WING) (REF) NO. 21 (RIGHT WING) (REF) SPRAY DUCTS (REF)
WING TAI DUCTING
B
NACELLE 2 3 ANTI-ICE
ON
14
AUTO
OFF
WING ANTI-ICE AUTO
OFF ON
SWITCH, YMLAS5
ANTI-ICE/RAIN REMOVAL MODULE, M7321
A
WING TAI
DUCTING
SEE B
SPRAY DUCTS
(REF)
INBD
FWD
Wing Thermal Anti-Ice System - Component Location
Figure 102
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747-400 MAINTENANCE MANUAL
WING THERMAL ANTI-ICE SYSTEM - ADJUSTMENT/TEST
_______________________________________________
1. General_______
A. There are three tasks in this subject. The first task is an operational test for the wing thermal anti-ice (TAI) system. In this test, you will set the WING ANTI-ICE switch on the overhead panel to the on and off position. You will monitor the operation of the system on the main EICAS.
B. The second task is a CMCS ground test of the wing TAI system. In this test, you will use the CMC to do a test of the system. You will look for CMC fault messages if the test result is not PASS.
C. The third task is a system test of the wing TAI system and its EICAS messages. In this test, you will monitor the position of the wing anti-ice valve while you operate the system. Then you do a ground test with the CMCS.
TASK 30-11-00-715-001
2. Operational Test - Wing Thermal Anti-Ice System_______________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 32-09-02/201, Air/Ground Relay System
(3)
SSM 30-11-01
(4)
WDM 30-11-11
B. Access
(1) Location Zone
221, 222 Control Cabin
C. Preconditions
S 865-049
(1) These conditions are necessary for this task:
(a)
Electrical power on (AMM 24-22-00/201).
(b)
Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).
(c)
Air/Ground Relay System is serviceable (AMM 32-09-02/201).
D. Procedure
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-046
(2)
Make sure that there is no pneumatic power supplied to the pneumatic system (this prevents the flow of hot air through the wing leading edge during the test).
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747-400 MAINTENANCE MANUAL
S 045-027
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO PREPARE
_______ THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Do this task: "Prepare Safety-Sensitive Systems for Air Mode Simulation" (AMM 32-09-02/201).
S 865-025
(4)
Open 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.
S 715-003
(5)
Make sure that the wing anti-ice valves open:
(a)
Set the WING ANTI-ICE switch on the anti-ice/rain removal module (P5 panel) to the ON position.
(b)
Make sure that the message WAI appears (in two locations on the main EICAS at the bottom of the engine N1 indicators).
S 715-004
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