Protection and Detection of Ice System

Question 1

(B) Ice and Rain protection system includes what?

Answer 1

1 - Wing anti-ice system
2 - Engine anti-ice system
3 - Windshield heating system
4 - ADSP/TAT heating system
5 - Windshield wiper system

Question 2

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

Answer 2

1 - Engine bleed air (10th Stage)

2 - Electric Heat

Question 3

(B) What uses bleed air for ice protection?

Answer 3

1 - Engine Lips

2 - Leading Edge Slat 2, 3, 4

Question 4

(B) What uses electric heat for ice protection?

Answer 4

1 - Pitot-static system
2 - Windshields
3 - Water lines
4 - Pressurization static port

Question 5

(I) Can the APU be used for anti-icing?

Answer 5

NO

Question 6

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

Answer 6

• 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 7

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

Answer 7

At least 1. There are two for redundancy

Question 8

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

Answer 8

5 minutes (Performance tables must still include in ‘icing conditions’)

Question 9

(B) If ‘icing’ on the MCDU is set to OFF and on takeoff roll icing conditions are encountered, will the de-icing system turn on?

Answer 9

Not until 1,700 ft. or 2 minutes after takeoff (whichever occurs first)

Question 10

(B) What is protected from ice and rain?

Answer 10

1 - Engine inlets
2 - Wing lead edge
3 - Smart Probes
4 - Windshields
5 - Water and Waste drain systems

Question 11

(B) Is the ice protection system automatic?

Answer 11

Yes, under normal conditions

Question 12

(B) Can the pilot override the automatic system?

Answer 12

Yes

Question 13

(B) How is ice detected?

Answer 13

• 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 14

(B) What compressor stage is bleed air tapped for anti-icing operations?

Answer 14

10th High Stage Valve (HSV)

Question 15

(B) How is bleed air directed for pneumatic anti-ice?

Answer 15

• Engines: Independent

- Wings: Onside bleed

Question 16

(B) What happens if there is a single bleed source failure?

Answer 16

The cross-bleed valve automatically opens

Question 17

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

Answer 17

MCDU set to ALL for A/I

Question 18

(B) What does selecting ‘ALL’ on the MCDU provide?

Answer 18

1 - Engine anti-ice: ON when engines are running

2 - Wing anti-ice: ON at 40 knots wheel speed

Question 19

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

Answer 19

1,700’ AGL or 2 minutes after takeoff (Whichever occurs first)

Question 20

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

Answer 20

1,700’ AGL or 2 minutes after takeoff (whichever occurs first)

Question 21

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

Answer 21

On ground inhibited

In Flight: Left side is heated (right heats if left has failed)

Question 22

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

Answer 22

• The wiper will stop

- To reset wiper move switch to OFF

Question 23

(B) What does the TIMER selection on the windshield wiper switch do?

Answer 23

Activates the associated wiper in 8-second intervals

Question 24

(B) When do the smart probes heat automatically? can you do this manually?

Answer 24

When engines are running.

Yes. ADS probe heater pushed IN, when power is available

Question 25

(B) Is there a test for the anti-ice system?

Answer 25

Yes, but maintenance performs this test

Question 26

(B) How should the aircraft be configured for de-icing procedures (TYPE I/IV)?

Answer 26

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

Question 27

(T) How many Air Data Smart Probes are heated?

Answer 27

All 4 of them

Question 28

(T) How many TAT’s are heated?

Answer 28

Both of them

Question 29

(I) If there is a Left Engine Fire will the cross-bleed valve open to heat the opposite leading edge slats?

Answer 29

NO

Question 30

(T) Is there a BIT test for the Ice protection?

Answer 30

Yes, occurs 10 minutes after takeoff or 10,000 (whichever occurs first) and lasts for 60 seconds

Question 31

(I) With batteries on only on the ground, can you heat the ADSP?

Answer 31

Yes, but only ADSP 3