Ice Protection/Detection

Question 1

What uses bleed air for ice protection?

Answer 1

Engine lips

3 outboard slats

Question 2

What uses electric heat for ice protection?

Answer 2

Pitot-static system
Windshields
Water lines
Pressurization static port

Question 3

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

Answer 3

Yes. The crossbleed valve opens to provide symmetrical ice protection for both wings

The failed engine does not receive heat to the engine lip

Question 4

How many ice detectors must be working to have icing detection?

Answer 4

One. There are two for redundancy

Question 5

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

Answer 5

5 minutes

Question 6

If ICING on MCDU is set to OFF and on takeoff roll icing conditions are encountered, will the de-icing system turn on?

Answer 6

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

Question 7

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

Answer 7

No

Question 8

What is protected from ice & rain?

Answer 8

Engine inlets
Wing leading edge
Smart probes
Windshields
Water and waste drain systems

Question 9

Is the ice protection system automatic?

Answer 9

Yes, under normal conditions

Question 10

Can the pilot override the automatic system?

Answer 10

Yes

Question 11

How is ice detected in flight?

Answer 11

2 ice detectors:

Vibrating sensor element that changes frequency when ice builds up around it
Once ice is detected, the sensor element heats, ice melts, the normal vibrating characteristics are restored, and the heating process stops. The cycle repeats as ice rebuilds on the probes.

Question 12

What compressor stage is bleed air tapped for any-icing operations?

Answer 12

10th High Stage Valve (HSV)

Question 13

How is bleed air directed for pneumatic anti-ice?

Answer 13

Engine…….independent

Wings……..onside bleed

Question 14

What happens if there is a single bleed source failure?

Answer 14

The crossbreed automatically opens

Question 15

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

Answer 15

ALL

Question 16

What does selecting ALL on the MCDU provide?

Answer 16

Engine anti-ice……..ON when engines are running

Wing anti-ice………..ON at 40 kts wheel speed

Question 17

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

Answer 17

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

Question 18

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

Answer 18

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

Question 19

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

Answer 19

On the ground it is inhibited

In flight the left side is heated (right heats if left has failed)

Question 20

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

Answer 20

Activates the associated wiper in 8-second intervals

Question 21

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

Answer 21

The wiper will stop

To reset wiper move switch to OFF

Question 22

When do the smart probes heat?

Answer 22

When an engine is running

Question 23

Is there a test for anti-ice system?

Answer 23

Yes, but maintenence performs this test

Question 24

How should the aircraft be configured for de-icing?

Answer 24

Bleeds…….OFF
Stab trim…….full nose down
Flaps…….up
Engines and APU……ON or OFF

Question 25

What sources use for aircraft anti-icing and de-icing?

Answer 25

Bleed air heat

Electric heat

Question 26

What surfaces are not protected by anti-ice system?

Answer 26

Vertical stabilizer
Horizontal stabilizer
Inboard slat panel

Question 27

After leaving icing conditions what message will remain on until landing and what precautions are to be taken?

Answer 27

Stall Prot Ice Speed message

Must use the landing speeds associated with Stall Prot Ice Speed

Question 28

How many sweeps on the wipers per minute if on high?low?

Answer 28

High: 120/minute
Low: 80/minute