MD-11 Flight Crew Operations Manual
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Ice and Rain Protection -
Controls and Displays
Ice.30.2
On the ground, pushing the WING or TAIL ANTI-ICE switch. The following
occurs:
• Ground sensing is bypassed.
• The respective (WING or TAIL) anti-ice valve opens.
• Disagree (DISAG) appears above the respective (WING or TAIL)
anti-ice valve on the AIR synoptic to indicate proper system function.
• The respective (WING or TAIL) anti-ice valve closes.
3. ANTI-ICE SYSTEM MANUAL Switch - amber
This momentary type switch allows selection of automatic or manual control
of the wing, tail, and engine cowl anti-ice systems.
MANUAL illuminates amber if the anti-ice system reverts from auto to
manual, or if the system is selected to manual. A-ICE SYS MANUAL is
displayed on the EAD.
NOTE: With installation of the automatic anti-ice system, the ENG,
WING, and TAIL ANTI-ICE switches are momentary type in lieu of
alternate action type.
4. WINDSHIELD DEFOG Switch - amber
The WINDSHIELD DEFOG switch, an alternate action switch, turns defog
power to the windshield on and off. WINDSHIELD DEFOG OFF illuminates
amber when windshield defog is commanded off.
With electrical power applied to the airplane, the defog controllers are
energized. Windshield defog automatically turns on and the WINDSHIELD
DEFOG OFF light extinguishes. The inner panes of the windshields and
window are heated.
5. (L/R) WINDSHIELD ANTI-ICE Switches - blue
The WINDSHIELD ANTI-ICE switch, an alternate action switch, turns
power to the windshield anti-ice controller on and off. The switch illuminates
blue when anti-ice is on normal or high (NORM or HIGH).
6. WINDSHIELD ANTI-ICE HIGH/NORM Switch - blue
The WINDSHIELD ANTI-ICE HIGH/NORM switch, an alternate action
switch, provides high or normal anti-ice heat to the windshield. HIGH
illuminates blue when the WINDSHIELD ANTI-ICE switch is on and high
heat is selected. NORM illuminates blue when the WINDSHIELD
ANTI-ICE switch is on and normal heat is selected.
HIGH position may be used to remove ice if NORM is inadequate.
Use of windshield heat prevents window fogging during a descent into high
humidity conditions.
October 02, 2006
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