MD-11 Flight Crew Operations Manual
k
Ice and Rain Protection -
Description and Operation
Ice.10.11
The ESC inhibits an anti-ice disagree annunciation when the FUEL switch is OFF,
and up to 45 seconds after the FUEL switch is turned ON.
During automatic mode operation of the ice protection system, the ENG
ANTI-ICE DISAG lights illuminate when commanded position disagrees with
actual position for more than 15 seconds.
Automatic Anti-Ice System Panel Interface
The automatic ANTI-ICE system control panel ENG, WING, and TAIL
ANTI-ICE switches are momentary action.
The ANTI-ICE SYSTEM MANUAL switch is a momentary switch with a single
MANUAL light.
Ice Detection System Preflight Test
The ice detection system is tested when the ANNUN LT TEST button is pushed
until the AIR SYS TEST alert is displayed. This feature is functional on airplanes
equipped with automatic anti-ice protection.
If the ESC senses one ice detection system as failed, the ICE DET SINGLE alert
is displayed. The ESC does not use that system as input to control the automatic
anti-ice protection system.
If the ESC senses both ice detection systems as failed, the ICE DETECTOR FAIL
alert is displayed. The automatic anti-ice protection system reverts to manual
mode.
If the alert ICE DET SINGLE or ICE DETECTOR FAIL was displayed due to a
failure of the ice detection preflight test, the alerts are cleared under the following
conditions:
• The preflight test is rerun and the ice detection systems pass the preflight
tests.
• Maintenance has cleared the problem from the ESC faults screen on the
CFDS.
A preflight failure of the ice detection system does not cause the AIR SYS TEST
FAIL alert to be displayed.
The ice detection system preflight failures are remembered through the AIR
control panel auto/manual/auto switch activations.
If the ANNUN LT TEST button is held for more than 1 minute, the alert ICE
DETECTOR FAIL is displayed and remains displayed until 10 seconds after the
button is released. This does not indicate an ice detection system failure.
Engine 2 Anti-Ice Duct Overheat Detection
This system is effective on KCE & on.
October 02, 2006
To Next Page
Loading...