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ERJ 170 Ice prot.
Ice protection/detection system questions
Question | Answer |
---|---|
What sources are used for aircraft anti-icing and de-icing? | • Bleed air heat• Electric heat |
What uses bleed air for ice protection? | • Engine lips• 3 outboard slats |
What uses electric heat for ice protection? | • Pitot-static system• Windshields• Water lines• Pressurization static port |
If an engine fails does the opposite wing and engine receive ice protection? | • Yes. The crossbleed valve opens to provide symmetrical ice protection for both wings• The failed engine does not receive heat to the engine lip |
How many ice detectors must be working to have icing detection? | • One. There are two for redundancy |
How long will the de-icing system remain on after icing is no longer detected? | • 5 minutes |
If ‘ICING’ on the MCDU is set to ‘OFF’ and on takeoff roll icing conditions are encountered, will the de-icing system turn on? | • Not until 1700 ft or 2 minutes after takeoff (whichever happens first) |
Can the APU be used to provide bleed air for de-icing? | NO |
What is protected from ice & rain? | • Engine inlets• Wing leading edge• Smart probes• Windshields• Water & waste drain systems |
Is the ice protection system automatic? | • Yes, under normal conditions |
Can the pilot override the automatic system? | YES |
How is ice detected in flight? | • 2 ice detectors• Vibrating sensor element that changes frequency when ice builds up around it |
What compressor stage is bleed air tapped for anti-icing operations? | • 10th High Stage Valve (HSV) |
How is bleed air directed for pneumatic anti-ice? | • Engines Independent• Wings Onside bleed |
What happens if there is a single bleed source failure? | • The crossbleed automatically opens |
How should the MCDU be set if there are icing conditions present on the ground? | 'ALL' |
What does selecting ‘ALL’ on the MCDU provide? | • Engine anti-ice ON when engines are running• Wing anti-ice ON at 40 kts wheel speed |
If ‘ALL’ is selected on the ground, at what point will the anti-ice system become automatic? | 1700’ AGL or 5 minutes after takeoff (whichever happens first) |
If ‘OFF’ is selected on the ground, at what point will the anti-ice system become automatic? | • 1700’ AGL or 2 minutes after takeoff (whichever happens first) |
How does the failure of one of the two power sources affect the windshield heating system? | • On ground Inhibited• In Flight Left side is heated (right heats if left has failed) |
What does the ‘TIMER’ selection on the windshield wiper switch do? | • Activates the associated wiper in 8-second intervals |
What happens if the wiper is operated on a dry windshield? | • The wiper will stop• To reset wiper move switch to ‘OFF’ |
When do the smart probes heat? | • When an engine is running |
Is there a test for the anti-ice system? | • Yes, but maintenance performs this test |
How should the aircraft be configured for de-icing? | • Bleeds OFF• Stab trim Full nose down• Flaps UP• Engines and APU ON or OFF |