30 - Anti Ice / De-Ice

Question 1

Define the difference between Anti-Ice and De-icing

Answer 1

Anti ice - Prevents ice build it
De-ice - Removes already formed ice

Question 2

What sections of the wing ae heated for anti ice?

Answer 2

Slats 3,4 & 5

Question 3

How is probe ice protection achieved?

Answer 3

Electrical heating of the individual probes, sensors and drain masts.

Question 4

How is eng anti icing achieved?

Answer 4

Direct bleed tap from HP compressor stage through eng air intake anti ice valve.

CFM-56 - 5th stage
V2500 - 7th stage
PW6000 - 9th stage

Question 5

For maintenance purposes, how long will Wing anti icing run for if P/Bsw on ground is selected?

Answer 5

30secs

Question 6

What type of ducts, distribute wing air?

Answer 6

Piccolo ducts

Question 7

What are the wing anti icing operating Px?

Answer 7

23 PSI - Normal
14.5 PSI - Low
30.5 PSI - High

Question 8

What happens if the PHC (Probe Heat Cpu) power supplied C/B is pulled or LGCIU power?

Answer 8

The related probes and static
ports will be fully heated.

Same, if the EIU power supply is pulled, the windows will be fully heated.

(Hence why Pitot/Static CBs are pulled as standard on post FLT.)

Question 9

What redundancy do the heated windows have?

Answer 9

2x single loop sensors. 1x of the 2x is a spare, and needs to be manually switched over in the event of a failure.

Question 10

Where are drain masts monitored?

Answer 10

The FAP (Flight Attendant Panel) shows warnings generated by CIDS (Cabin Intercommunication Data System).

The drain mast CU (Control Unit) also has basic BITE function on the unit itself.

Question 11

What are the 2x lvls of Ice detection?

Answer 11

ICE DETECTED + SEVERE ICE DETECTED

Question 12

What happens whilst eng anti ice is activated, to stop flame out from too much water ingestion to the engine?

Answer 12

Continuous ignition