KLM MD-11 - Airfoil Anti-Ice Valve Disagree; Wing or Tail Anti-Ice Manifold Failure; ESC - CAC Manifold Failure Test Procedure; ESC - 1-2 Manifold Failure Test Procedure

MD-11 Flight Crew Operations Manual
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Ice and Rain Protection -
Description and Operation
Ice.10.9
The ICE DETECTED alert is cleared when the ice detection system no longer
detects icing conditions.
Airfoil Anti-Ice Valve Disagree
In flight, when operating in auto anti-ice in icing conditions and the ERSC detects
a wing anti-ice valve failed closed for 25 seconds, the wing anti-ice system is
commanded off and ICE DETECTED is displayed. On the ground, the ESC
depressurizes the associated pneumatic system any time a valve is detected as
failed open.
Wing or Tail Anti-Ice Manifold Failure
The ESC turns the associated anti-ice system off during a wing or tail anti-ice
failure if the system is active. The associated pneumatic system is turned off if the
failure continues, or, for a non active system.
ESC - CAC Manifold Failure Test Procedure
The ESC commands wing and tail anti-ice valves closed during a CAC manifold
failure test procedure.
If the air system is in manual, the ESC cannot close the wing and tail anti-ice
valves automatically. The valves have to be closed manually by the crew.
ESC - 1-2 Manifold Failure Test Procedure
For the duration of the test, during a 1-2 manifold failure test, the ESC commands
the wing anti-ice system off when pneumatic system 1 is depressurized. The tail
anti-ice system is commanded off when pneumatic system 2 is depressurized.
ESC - Single Manifold Failures
The wing anti-ice system is commanded off when the ESC senses a pneumatic
system 1 or 3 manifold failure, or a left/right wing manifold failure.
The tail anti-ice system is commanded off when the ESC senses a pneumatic
system 2 manifold failure, or a tail manifold failure.
ENG FIRE Handle Operation
With the ice protection system in automatic mode, pulling an ENG FIRE or APU
FIRE handle results in the associated engine being shut down. The respective
engine cowl anti-ice system is unavailable when an engine is shut down.
The ESC turns off associated systems as follows:
• Engine 1 or 3 - wing anti-ice system.
• Engine 2 - tail anti-ice system.
• APU - tail anti-ice system.
October 02, 2006