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E175 > Ice Detection/Protection > Flashcards

Ice Detection/Protection Flashcards

1
Q

What is the purpose of the Engine Anti-Ice System?

A

The Engine Anti-Ice System provides anti-icing protection by controlling the respective valve.

Example: The reset valve begins to open for anti-icing protection.

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2
Q

How does the Wing Anti-Ice System function?

A

The Wing Anti-Ice System uses bleed air as a source to provide symmetrical ice protection throughout the flight.

Example: The system opens the bleed valve to ensure protection.

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3
Q

When do the engine and wing anti-ice systems operate automatically?

A

They operate automatically based on system logic when the mode selector is in AUTO.

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4
Q

What powers the Windshield Heating System?

A

The Windshield Heating System is electrically powered.

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5
Q

What happens to the windshield heat when only a single source of power is available?

A

On the ground, the windshield heat is OFF.

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6
Q

When is the Air Data Smart Probe (ADSP)/TAT Heating System ON?

A

The ADSP/TAT Heating System is ON when the engine is running and AC power is available with the probe heater switch on.

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7
Q

What is the purpose of the Water and Waste Ice Protection System?

A

Prevents fill drain nipples from freezing

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8
Q

How many ice detectors are installed on the aircraft?

A

There are two (2) ice detectors installed on the left and right side of the nose section.

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9
Q

What is the first step in the operation of the Ice Detectors?

A

Probes vibrate at a certain frequency

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10
Q

What happens when ice accumulates on the probes?

A

Vibrating frequency changes, causing the probes to heat up

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11
Q

What activates after the probes heat up?

A

Wing & Engine Anti-Ice activates, melting the ice off the probes

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12
Q

How long does the ice detection system remain active after icing conditions are no longer sensed?

A

It remains on for 5 minutes.

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13
Q

What happens in case of a dual ice detector failure?

A

The anti-ice operation is only possible in manual mode.

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14
Q

What should the MODE knob be set to under normal conditions?

A

The MODE knob should always be in AUTO unless directed to ON by the QRH.

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15
Q

What conditions allow for the ice detection system to be turned OFF?

A

When ice has been detected, the system can be turned OFF if:
- >1700’ AGL or 2 minutes after takeoff
- Engines running
- Wheel speed > 40 knots

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16
Q

Can the APU be used for deicing?

A

No, the APU cannot be used for deicing.

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17
Q

What sources are used for aircraft anti-icing and de-icing?

A

Bleed air heat and electric heat

18
Q

What uses bleed air for ice protection?

A

Sourbo blind slats (slats 2, 3 and 4 on each wing)

19
Q

What uses electric heat for ice protection?

A

Total air temperature (TAT) probes

20
Q

If an engine fails, does the opposite wing and engine receive ice protection?

A

The failed engine does not receive ice protection

The wing does

21
Q

How many ice detectors are required for icing detection?

A

One

22
Q

How long will the de-icing system remain on after icing is no longer detected?

A

5 minutes

23
Q

If REF A/l on the MCDU is set to ‘OFF’ and icing conditions are encountered during takeoff, will the de-icing system turn on?

A

Not until 1700 ft. or 2 minutes after takeoff (whichever happens first)

24
Q

Can the APU be used to provide bleed air for anti-icing?

A

No

25
Q

What is protected from ice & rain?

A

Engine inlets, probes, total air temperature probes, windshields, water & waste drain systems

26
Q

Is the ice protection system automatic?

A

Yes, under normal conditions

27
Q

Can the pilot override the automatic system?

A

Yes

28
Q

How is ice detected in flight?

A

Using two ice detectors with a vibrating sensor element that changes frequency when ice builds up.

29
Q

What stage is the bleed air valve for engine components?

A

6th stage (slats only)

30
Q

How is bleed air directed for pneumatic anti-ice?

A

Engines (onside only), wings (onside priority, offside if bleed source failure)

31
Q

What happens if there is a single bleed source failure?

A

The crossbleed automatically opens.

32
Q

How should the MCDU be set if there are icing conditions present on the ground?

A

ENG ON - Between 5°C and 10°C with visible moisture

ALL ON - Below 5°C with visible moisture

33
Q

What does selecting ‘ALL’ on the MCDU provide?

A

Engine anti-ice ON when engines are running

Wing anti-ice ON at 40 kts. wheel speed

34
Q

If ‘ALL’ is selected on the ground, at what point will the anti-ice system become automatic?

A

1700’ AGL or 2 minutes after takeoff (whichever happens first)

35
Q

If ‘OFF’ is selected on the ground, at what point will the anti-ice system become automatic?

A

1700’ AGL or 2 minutes after takeoff (whichever happens first)

36
Q

How does the failure of one of the two power sources affect the windshield heating system?

A

On ground Inhibited
In Flight Left side is heated (right heats if left has failed)

37
Q

What does the ‘TIMER’ selection on the windshield wiper switch do?

A

Activates the associated wiper in 8-second intervals

38
Q

What happens if the wiper is operated on a dry windshield?

A

The wiper will stop

To reset wiper move switch to ‘OFF’

39
Q

When do the smart probes heat?

A

When an engine is running
In flight; or
When the ADS probe heater button is pushed with AC power without engines running on the ground

40
Q

Is there a test for the anti-ice system?

A

Yes, but maintenance performs this test

41
Q

How should the aircraft be configured for de-icing?

A

Bleeds OFF
Packs OFF
Stab trim Full nose down
Flaps UP
Engines and APU ON or OFF

APU is recommended OFF. Use the De-icing/Anti-Icing Fluid Application Checklist

E175 (8 decks)

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