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 B.  Wing Thermal Anti-Ice System (AMM 30-11-00)
 (1)  The wing thermal anti-ice (TAI) system prevents the formation of ice on the leading edge of the wings. Heated air is supplied from the airplane bleed air manifold.
 C.  Engine Nacelle Anti-Ice System (AMM 30-21-00)
 (1)  The engine nacelle thermal anti-ice system prevents the formation of ice on the leading edge of the four engine inlet cowls. The heated air is supplied from the engine pneumatic systems.
 D.  Pitot-Static, Total Air Temperature Probe and Angle of Attack Sensor Anti-Ice System (AMM 30-31-00)
 (1)  The pitot-static probes, total air temperature probes, and angle of attack sensors are electrically heated to prevent the formation of ice which would affect sensor accuracy. Probe heat is controlled automatically.
 E.  Engine PT2/TT2 Probe Anti-Ice System (AMM 30-34-00)
 (1)  The Electronic Engine Control (EEC) PT2/TT2 probes are electrically heated to prevent the formation of ice which would affect sensor accuracy. Probe heat is controlled automatically.
 F.  Flight Compartment Window Anti-Ice System (AMM 30-41-00)
 (1)  The flight compartment windows are electrically heated to prevent icing on the No. 1 left and right windows and fogging on the No. 2 and 3 left and right windows. The windows are heated by an electrical resistance coating laminated into the windows.
 G.  Windshield Wiper System (AMM 30-42-00)
 (1)  Two windshield wipers maintain a clear area on the captain's and first officer's No. 1 windows during takeoff, approach and landing in rain or snow. Each wiper is operated by a separate system to ensure that clear vision will be maintained through one of the windows in the event of a system failure.
 H.  Windshield Rain Repellent System (AMM 30-43-00)
 (1)  The rain repellent system consists of a hydrophobic coating applied to the number 1 window. No pilot actions are necessary to operate the system.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 I. Windshield Washer System (AMM 30-44-00)
 (1)  
The windshield washer system sprays washer fluid on the No. 1 flight compartment windows to clean them. The windshield wiper must be used when cleaning the windows with the windshield washer system. The washer fluid for both windows is supplied from the same container, but is controlled independently for each window.

 (2)  
For repair of flareless tube assemblies, refer to instructions in AMM 20-11-05, Flareless Tubing Assembly.

 J. Water Line and Waste Drain Heaters (AMM 30-71-00)
 (1)  
The waste tank drain fitting and rinse fittings are electrically heated to prevent ice formation which could block the fittings.

 (2)  
The waste water drain lines are electrically heated to prevent freezing of lines. The forward, center, and aft drain masts are heated to prevent ice from blocking the waste water drains.

 (3)  
The water supply lines are electrically heated where they pass through the unheated sections of the airplane. The lines at the water supply tanks are also heated.

 K. Ice Detection System (AMM 30-81-00)
 (1)  The ice detection system provides flight deck indication of icing conditions and automatic activation of wing and nacelle thermal anti-ice systems.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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2.

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A
747-400 MAINTENANCE MANUAL
 WING THERMAL ANTI-ICE SYSTEM - DESCRIPTION AND OPERATION
________________________________________________________
General (Fig. 1)
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 A.  The wing thermal anti-ice (TAI) system prevents the formation of ice on the leading edge of the wings. The wing TAI system receives regulated hot air from the bleed air pneumatic manifold (Ref 36-00-00). The flow of hot air to the leading edge is controlled by a pneumatic valve in each wing. When the valve is open, hot air flows through ducting behind the wing leading edge. A control switch on the flight deck allows the valve to be opened or closed, or put under automatic control of the ice detection system (Ref 30-81-00).
　
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