Ice & Rain Protection

Question 1

What sources are used for A/C A/I and Deicing?

Answer 1

1. Bleed Air heat
2. Electrical heat

Question 2

What uses bleed air for ice protection?

Answer 2

1. Engines lips (HP #10 bleed)
2. Outboard Slats (2,3,4 on each wing)

Question 3

What uses electrical heat for protection?

Answer 3

1. Smart probes
2. TAT probes
3. Windshields
4. Water lines
5. Pressurization static port

Question 4

If an engine fails, does the opposite wing and engine receive bleed air?

Answer 4

X-bleed opens automatically when bleed source is lost and opposite wing receives bleed air, failed engine lip does not (engine A/I CV shuts if engine OFF)

Question 5

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

Answer 5

One, 2 for redundancy

Question 6

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

Answer 6

5 mins

Question 7

If icing on the MCDU is set to ‘OFF’ and on takeoff roll icing conditions are encountered, will the deicing system turn on?

Answer 7

Yes at 1700 ft AFE or 2 mins after takeoff whichever happens first

Question 8

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

Answer 8

No

Question 9

What is protected from ice & rain?

Answer 9

1. Engine inlets (HP # 10 bleed)
2. Wing leading edge
3. Smart probes and TAT probes
4. Windshields
5. Water & waste drain systems

Question 10

Is the ice protection system automatic?

Answer 10

Yes under normal conditions

Question 11

Can the pilot override the automatic system?

Answer 11

Yes

Question 12

How is ice detected?

Answer 12

2 ice detectors
1. Smart probe vibrates,
2. ice accumulates and vibrating freq. changes,
3. sensor element heats
4. Wing and Eng A/I activates
5. Ice melts off probes
6. Probes return to normal conditions

Question 13

Which bleed is tapped for anti-icing operations?

Answer 13

10th High Stage Valve (HSV)

Question 14

How is bleed air directed for pneumatic anti-ice for engines and wings?

Answer 14

Engines = Independent
Wings = onside bleed

Question 15

What happens if there is a single bleed source failure?

Answer 15

Crossbleed automatically opens

Question 16

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

Answer 16

ALL

Question 17

What is set on the MCDU for TATs between 5º and 10º for ice protection?

Answer 17

ENG

Question 18

What is set on the MCDU for TATs below 5º?

Answer 18

ALL

Question 19

What does selecting “ALL” on the MCDU provide for ice protection?

Answer 19

Engine A/I = ON while engines are running
Wing A/I = ON at 40 kt wheel speed

Question 20

How does the failure of one of the 2 power sources affect the windshield heating system?

Answer 20

1. On ground = inhibited
2. In flight = Left side is heated (right heats if left side fails)

Question 21

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

Answer 21

Activates the associated wiper in 8-second intervals

Question 22

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

Answer 22

1. Wiper will stop
2. To reset wiper move switch to OFF

Question 23

When do the smart probes begin heating?

Answer 23

When engines are running

Question 24

Is there a test for the A/I System?

Answer 24

Yes, but this is a MX task

Question 25

How should the A/C be configured for deicing?

Answer 25

1. Bleeds = OFF
2. Packs = OFF
3. Stab. Trim = FULL NOSE DOWN
4. Flaps = UP
5. Engines and APU = ON and OFF

Question 26

How many AC electrical sources are required for normal windshield heat operation?

Answer 26

2 AC sources

Question 27

When the batteries are the only electrical source to the aircraft, which ADSP is the heated?

Answer 27

Only ADSP 3

Question 28

How does the engine anti-ice valve fail?

Answer 28

It fails to the OPEN position, not to be confused with IF ENG shuts down the valve CLOSES to prevent unnecessary engine lip heating to dead engine