MD-11 Flight Crew Operations Manual
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Ice and Rain Protection -
Description and Operation
Ice.10.8
• Environmental System Controller (ESC).
• Ice detection system in conjunction with ANTI-ICE control panel.
• ANTI-ICE SYSTEM MANUAL switch on the overhead panel.
The automatic ice protection system provides the following:
• Indication.
• Fault detection monitoring.
• Test capability.
• Reconfiguration capability.
• Anti-ice system manual control.
The automatic ice protection system has a dedicated ANTI-ICE SYSTEM
MANUAL switch on the overhead panel. This switch allows the flight crew to
place the ice protection system in manual mode with the AIR control panel in auto
mode.
The ice protection system operates in the auto mode when the AIR control panel
is placed in auto.
The ice protection system reverts to manual mode for the following:
• The AIR control panel is selected or reverts to manual.
• Both ice detection systems are failed more than 60 seconds.
When the ice protection system reverts to manual, the system leaves the valves in
their last commanded position. While in manual, the ESC does not command the
anti-ice system valves.
When auto is selected, the ESC evaluates ice detection system status, and
reconfigures the anti-ice valves.
The ESC does not use a failed ice detection system ICE signal to control wing, tail,
or engine cowl anti-ice system valves.
Wing/Tail and Engine Cowl Anti-Ice Control System
The wing and tail anti-ice valves are armed on the ground or open in flight, and
the engine cowl anti-ice valves are open for the following:
• When in auto and ice is detected.
• When in manual and the flight crew selects the respective anti-ice system
on.
The ESC turns off the wing, tail, and associated engine cowl anti-ice system when
the system is in auto and all three engines are not running.
Wing/Tail and Engine Cowl Anti-Ice System Failure
During automatic operation of the anti-ice system in icing conditions, the ICE
DETECTED alert is displayed. When the ESC detects a condition which prevents
an anti-ice valve from opening, ICE DETECTOR FAIL alert is displayed.
October 02, 2006
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