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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
WING THERMAL ANTI-ICE SYSTEM - DESCRIPTION AND OPERATION
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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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