MD-11 Flight Crew Operations Manual
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Ice and Rain Protection -
Description and Operation
Ice.10.5
Appropriate alerts are displayed for windshield heat on and for failure conditions.
The windshields are constructed of a glass-vinyl-glass-vinyl-glass, layered
configuration. A thin anti-ice heating film (stannous oxide) is on the inboard
surface of the outer glass pane, next to the vinyl layer. Heating is accomplished by
electrical potential across the resistive oxide film.
Defogging is accomplished by applying power to a similar conductive film on the
outboard surface of the inner glass pane. The defogging system consists of
elements and sensors in each windshield, clearview, and aft window and a
controller for each window. A single DEFOG switch controls defogging. DEFOG
should be on for all flight conditions.
Two switches (L/R WINDSHLD ANTI-ICE) on the lower maintenance panel
allow maintenance personnel to switch between primary and spare (L and R)
anti-ice heat sensors on each windshield. Six switches on the lower maintenance
panel (L/R WINDSHLD, L/R CLEARVIEW, and L/R AFT WINDOW) allow
maintenance personnel to switch between primary and spare (L and R) defogging
heat sensors on each window.
Windshield Wiper System
A separate wiper system is installed for left and right windshields. Each wiper
system is independently controlled by a WINDSHLD WIPE selector on the
forward overhead panel.The wipers may be selected to OFF/SLOW/FAST.
With wipers selected to OFF, the wiper and arm assembly move to the vertical,
parked position.
Operation of the windshield wipers on a dry surface is not recommended.
Ice Detection System
General
The ice detection system determines when the wing, tail, and engine ice protection
systems should be turned on or off.
The ice detection system is a dual detector system (left and right). Each detector
system has an independent failure monitoring system. For the ice detection system
to be considered the primary indicator of an aircraft-in-ice condition, both left and
right ice detector systems must be operative.
Both left and right systems consist of a sensor in each wing engine cowl and a
controller in the leading edge of the wing near the engine pylon area.
Both left and right ice detector controllers interface with the ESC. The system
operates using 115-volt ac power.
October 02, 2006
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