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B737-800 > Ice and Rain Protection > Flashcards

Ice and Rain Protection Flashcards

1
Q

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

A

Pack 1

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2
Q

When would the COWL VALVE OPEN light illuminate bright?

What would the valve being dim mean?

What if the light was off?

A

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

Dim = valve open
Off = valve closed
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3
Q

What does TAI stand for on the engine indications?

A

Thermal Anti Ice

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4
Q

What does a green TAI on the engine indications mean?

A

Cowl valve open with switch on

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5
Q

What does an amber TAI on the engine indications mean?

A

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.

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6
Q

What does the amber COWL ANTI-ICE LIGHT indicate?

A

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

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7
Q

What pressure would trip the COWL ANTI-ICE light?

A

> 65 psi

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8
Q

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

A

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

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9
Q

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

A

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

FMC Vref speed is not adjusted automatically.

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10
Q

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

What will happen if AC power is lost?

A

28v DC solenoid.

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

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11
Q

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

A

3 inboard leading edge slats on each wing.

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12
Q

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

Why?

A

On

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

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13
Q

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

A

115v AC

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14
Q

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

A

Both

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15
Q

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

A

On the ground when thrust levers are advanced for take off

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

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16
Q

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

A

Logic remains adjusted for remainder of flight.

17
Q

How are probes heated?

A

Electrically

18
Q

Are static ports heated?

A

No, because they are flush with the fuselage.

19
Q

What power do the probe heat elements use?

A

115v AC

Current detection circuits use 28v DC power

20
Q

When only will the captains pitot probe be heated?

A

When on standby power

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

21
Q

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

A

6 normal

4 eyebrow, left over from Boeing 707 days (stopped in 2005, saves weight and and maint costs)

22
Q

What is the structure of a non-heated window?

A

Stretched Acrylic with a gap core

23
Q

What is the structure of a heated window?

A

Glass with a vinyl core.

24
Q

Target window 1 and 2 heat temperature is…?

A

43 deg c

25
Q

When will a window overheat trip occur?

A

If temp exceeds 62 deg c

26
Q

What does WHCU stand for?

A

Window Heat Control Unit

27
Q

What power does the wiper system use?

A

28v DC

28
Q

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

A

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

Start switches to Cont, then switch on.

29
Q

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

A

Above FL350 because it demands a lot of Bleed air.

30
Q

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

A

Hydrophobic

31
Q

Wiper INT position provides intermittent operation every…?

A

7 seconds

B737-800 (6 decks)

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