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E175 Study Guide > Ice and Rain Protection > Flashcards

Ice and Rain Protection Flashcards

1
Q

When S.E. Taxing (ENG1 or 2) and the APU running, would both windshields be
heated?

A

Yes
- There would be normal windshield heating since you have two sources of AC
power.

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2
Q

When does the windshield heat perform its BIT?

A
  • When a single AC power is available (IDG) the corresponding windshield heat
    will heat for 120 sec
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3
Q

Can you have windshield heat in Flight with a single source AC?

A
  • Yes, but only the left windshield is heated, unless the left heating system fails,
    then the right will be powered
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4
Q

When does the wing anti ice perform its test?

A
  • Reaching 10000 feet AGL or ten minutes after takeoff, whichever is first
  • EICAS message A-I WING VLV OPEN
  • Synoptic page will indicate that the A-I valves have opened
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5
Q

How are the Engine Cowls heated?

A
  • Hot Bleed Air

- 10th Stage Compressor section

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6
Q

How do you turn the Engine Anti-Ice on for Icing Conditions on the Ground (T/O)

A
  • Via the MCDU on the T/O Data Set menu.
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7
Q

With ALL selected on the MCDU for ENG and WING Anti Ice, when will the ENG
and WING Anti-Ice come on?

A
  • ENG - After engine start

- Wing - Wheel speed greater than 40 knots

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8
Q

In AUTO, when does the Ice Protection system function automatically?

A
  • After 1700 AGL or 2 minutes after takeoff (regardless of MCDU setting)
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9
Q

What is the purpose of the Ice Detector(s)?

A
  • They command the ENG and WING Anit-Ice valves to open above 1700 agl or 2 minutes after takeoff, once ice has been detected and stay open for 2 minutes
    after ice is no longer detected.
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10
Q

10.Does the Engine Bleed valve fail open or closed?

A
  • Fail safe open if either the electrical or pressure signal are not present.
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11
Q

11.If the REF A/I Mode is set to OFF, when are the Anti-Ice valves inhibited?

A
  • Til 1700 feet or 2 minutes after liftoff.
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12
Q

12.When are the Air Data Smart Probes and TAT probes heated?

A
  • Whenever an engine is running or airborne
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13
Q

13.What sources are used for airplane anti-icing and de-icing?

A
  • Bleed air heat

- Electric heat

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14
Q

14.What uses bleed air for ice protection?

A
  • Engine Cowls

- Outboard Slats (3)

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15
Q

15.What uses electric heat for ice protection?

A
  • Pitot-static system.
  • Windshields
  • Water lines
  • Pressurization static port
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16
Q

16.If an engine fails, does the a. opposite wing / b. engine receive ice protection?

A
  • Yes. The Crossbleed valve opens to provide symmetrical ice protection for both
    wings.
  • The failed engine does not receive heat to the engine lip.
17
Q

17.How many ice detectors must be working to have ice detection?

A
  • One (two for redundancy)
18
Q

18.Can the APU be used to provide bleed air for deicing?

A

No

19
Q

19.What is protected from ice and rain?

A
  • Engine inlets
  • Wing leading edge
  • Smart probes
  • Windshields
  • Water and waste drains
20
Q

20.Can the pilot override the automatic function of the Anti-Ice system?

A

Yes

21
Q

21.How do the Ice Detectors work/function?

A
  • Vibrating sensor 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.
22
Q

22.What compressor stage is bleed air tapped for anti-icing operations?

A
  • 10th high stage valve (HSV)
23
Q

23.How is bleed air directed for pneumatic anti-ice?

A
  • Engine: Onside Only

- Wings: Onside or Crossside

24
Q

24.What happens if there is a single source failure?

A
  • The Crossbleed automatically opens (Fire Handle not pulled)
25
Q

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

A

All

26
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 comes first)
27
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)
28
Q

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

A
  • The wiper will stop.

- To reset wiper, move switch to OFF..

29
Q

Is there a test for the anti-ice system?

A
  • Yes, but maintenance performs the test.

E175 Study Guide (23 decks)

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