MD-11 Flight Crew Operations Manual
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Ice and Rain Protection -
Description and Operation
Ice.10.10
SMOKE ELEC/AIR Selector Operation
Moving the SMOKE ELEC/AIR selector on the ELEC control panel from NORM
turns off wing anti-ice. Returning the selector to NORM turns wing anti-ice back
on.
Tail anti-ice is not available when 3/1 OFF or 1/2 OFF are selected.
Tail anti-ice operates normally when 2/3 OFF is selected.
DITCHING Switch
The ESC commands the associated wing and tail anti-ice systems off as pneumatic
systems are shut down following selection of DITCHING ON.
Bleed Air Temperature High Operation
The ESC reverts the ice protection system and the air system to manual when a
single bleed air source is feeding 2 or 3 pneumatic manifolds and a high
temperature condition exists in an airfoil (wing or tail) anti-ice system bleed air
source.
DEU Alerting
The A-ICE SYS MANUAL alert is displayed when the automatic anti-ice system
is in manual.
The ICE DETECTED alert is displayed when, in automatic mode, any anti-ice
system is not commanded on while ice condition is detected.
When the automatic anti-ice system opens a wing, tail, or engine cowl anti-ice
valve, the following alerts appear:
• AIRFOIL A-ICE ON indicates wing and/or tail anti-ice valves are open.
• ENG 1/2/3 A-ICE ON indicates respective engine cowl anti-ice valve is
open.
• ENGINE A-ICE ON indicates all three engine cowl anti-ice valves are
open.
• A-ICE ALL ON indicates wing, tail, and engine cowl anti-ice valves are
open.
Annunciator Controls
The ANTI-ICE SYSTEM MANUAL switch illuminates when the ice protection
system is in manual mode. If in automatic mode, this switch blinks when a
momentary switch on the ANTI-ICE control panel is pushed.
Status of the respective anti-ice valves is indicated on the ANTI-ICE control
panel. WING and TAIL ANTI-ICE switches illuminate ON when commanded
open/armed. ENG 1/2/3 ANTI-ICE switches illuminate ON when the associated
engine cowl anti-ice valves are commanded open.
The PSCs provide wing and tail anti-ice disagree indication.
October 02, 2006
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