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25 Cards in this Set
- Front
- Back
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What sources are used for aircraft anti-icing and de-icing?
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Bleed Air
Electric |
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What uses bleed air for ice protection?
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Engine lips
3 outboard slats |
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What uses electric heat for ice protection?
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Pitot-static systems
Pressurization static port Windshields Water lines |
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If an engine fails does the opposite wing and engine receive ice protection?
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The crossbleed valve opens to provide symmetrical ice protection for both wings.
The failed engine does not receive heat to the engine lip |
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How many ice detectors must be working to have icing detection?
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One. There are two for redundancy
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How long will the de-icing system remain on after icing is no longer detected?
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5 minutes
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Can the APU be used to provide bleed air for de-icing?
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No
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What is protected from ice & rain?
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Engine inlets
Wing leading edge Smart probes Windshields Water & waste drain systems |
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Is the ice protection system automatic?
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Yes, under normal conditions
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Can the pilot override the automatic system?
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Yes
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How is ice detected in-flight?
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2 ice detectors.
Vibrating sensors element that changes frequency when ice builds up around it. Once ice is detected, the sensor element heats, the ice melts, the normal vibrating characteristics are restored, and the heating process stops. The cycle repeats as ice rebuilds on the probes. |
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What compressor stage is bleed air tapped from for anti-icing operations?
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10th High Stage Valve (HSV)
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How is bleed air directed for pneumatic anti-ice?
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Engines Independent
Wings Onside bleed |
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What happens if there is a single bleed source failure?
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The crossbleed automatically opens
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How should the MCDU be set if there are icing conditions present on the ground?
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ALL
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What does selecting 'ALL' on the MCDU provide?
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Engine anti-ice ON when engines are running Wing anti-ice ON at 40 kts wheel speed
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If 'ALL' is selected on the ground, at what point will the anti-ice system become automatic?
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1700 feet AGL or 2 minutes after takeoff (whichever happens first)
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If 'OFF' is selected on the ground, at what point will the anti-ice system become automatic?
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1700 feet AGL or 2 minutes after takeoff (whichever happens first)
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How does the failure of one of the 2 power sources affect the windshield heating system?
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On ground Inhibited In flight Left side is heated (right heats if left has failed)
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What does the 'TIMER' selection on the windshield wiper switch do?
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Activates the associated wiper in 8-second intervals
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What happens if the wiper is operated on a dry windshield?
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The wiper will stop To reset wiper, move switch to 'OFF'
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When do the smart probes heat?
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When an engine is running
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Is there a test for the anti-ice system?
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Yes, but maintenance performs this test
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How should the aircraft be configured for Deicing/Anti-icing?
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Parking Brake Set
Bleeds Off (Bleed 1, Bleed APU, Bleed 2) Stab trim Full nose down Flaps / Slats Up Engines On or Off (Thrust - IDLE) APU On or Off |
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Definition of Icing Conditions
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10ºC or less and visible moisture in any form is present such as clouds,fog with visibility of 1 mile or less, rain, snow, sleet, ice crystals...
or contaminated runways or taxiways |
