Ice And Rain Protection

Question 1

Conditioned air for defogging of the no 1 windows can be routed from which pack?

Answer 1

PACK 1

Question 2

When would the COWL VALVE OPEN light illuminate bright?

What would the valve being dim mean?

What if the light was off?

Answer 2

When the valve is in transit or when the valve is in disagreement with the switch.

Dim = valve open
Off = valve closed

Question 3

What does TAI stand for on the engine indications?

Answer 3

Thermal Anti Ice

Question 4

What does a green TAI on the engine indications mean?

Answer 4

Cowl valve open with switch on

Question 5

What does an amber TAI on the engine indications mean?

Answer 5

The position of the cowl anti-ice valve disagrees with the position of the switch, and will only appear after 8 seconds of this disagreement.

Question 6

What does the amber COWL ANTI-ICE LIGHT indicate?

Answer 6

That there is an over pressure condition in the duct, downstream of the anti-ice valve.

Question 7

What pressure would trip the COWL ANTI-ICE light?

Answer 7

> 65 psi

Question 8

Would you get eng anti-ice with the eng Bleed air switch off?

Answer 8

Yes, because Bleed air for eng anti-ice is taken upstream from the eng bleed valve.

Question 9

When the eng anti-ice switches are on, what is adjusted?

Answer 9

Stall logic (stick shaker speed, manoeuvre speed bars on pfd etc).

FMC Vref speed is not adjusted automatically.

Question 10

The COWL ANTI-ICE valves are powered by a…?

What will happen if AC power is lost?

Answer 10

28v DC solenoid.

The valves will spring load closed and engine anti-ice will not be available.

Question 11

What parts of the wing are protected by wing anti-ice?

Answer 11

3 inboard leading edge slats on each wing.

Question 12

For the wing anti-ice to function, a Bleed air switch needs to be positioned…?

Why?

Answer 12

On

Because bleed air is taken downstream of the eng bleed valve, so bleed air switch must be open.

Question 13

What are the wing anti-ice control valves controlled by?

Answer 13

115v AC

Question 14

Can wing anti-ice be used in the air or on the ground?

Answer 14

Both

Question 15

What 2 conditions will cause the wing anti-ice control valves to automatically trip closed?

Answer 15

On the ground when thrust levers are advanced for take off

When there is a over temp condition in the wing distribution ducts.

Question 16

What happens to the stall warning logic after the wing anti-ice is switched off in flight?

Answer 16

Logic remains adjusted for the remainder of the flight

Question 17

How are probes heated?

Answer 17

Electrically

Question 18

Are static ports heated?

Answer 18

No, because they are flush with the fuselage

Question 19

What power do the probe heat elements use?

Answer 19

115v AC

Current detection circuits use 28v DC power

Question 20

When only will the captains pitot probe be heated?

Answer 20

When on standby power

but no probe heat lights will illuminate, even the capt pitot probe light (on stby power)

Question 21

How many normal windows and how many eyebrow windows are there?

Answer 21

6 normal

4 eyebrow, left over from boeing 707 days

Question 22

What is the structure of a heated window?

Answer 22

Glass with a vinyl core

Question 23

Target window 1 and 2 heat temperature is…?

Answer 23

43 deg

Question 24

When will a window overheat trip occur?

Answer 24

If temp exceeds 62 deg

Question 25

What does WHCU stand for?

Answer 25

Window Heat Control Unit

Question 26

What power does the wiper system use?

Answer 26

28v DC

Question 27

When would you use eng anti-ice and how would you select it?

Answer 27

TAT 10 deg or less all the way to -40 deg SAT and visible moisture

Question 28

When could wing anti-ice trigger a bleed valve trip, causing a possible loss of cabin pressure?

Answer 28

Above FL350 because it demands a lot of bleed air

Question 29

Windows 1L/R are treated with what type of coating?

Answer 29

Hydrophobic

Question 30

Wiper INT position provides intermittent operation every…?

Answer 30

7 seconds