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Q400 > Ice & Rain Protection > Flashcards

Ice & Rain Protection Flashcards

1
Q

What does the ED display if there is ice?

A

ICE DETECTED

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2
Q

Heated ice protection components?

A

2 AoA vanes
2 Pitot/static probes
Leading edge of prop blades
Intakes on both engine
Pilot and copilot windshield
Pilot side window
Pilots standby static probe heated using DC power from the ess bus

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3
Q

Where are the ice detection probes located and how do they work?

A

Left and right side of the aircraft nose.
They vibrate at a frequency and any ice accumulation causes the vibration to increase due to increased rigidity.

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4
Q

How is the ice detection system activated?

A

Automatically when 115V AC power is available

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5
Q

REF SPEEDS switch to INCR does what?

A

White INCR REF SPEED message on ED
The stall protection system adjusts the stalk margin for operating in icing conditions

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6
Q

ICE DETECTED message on ED will flash yellow when?

A

When ice is detected but the REF SPEED switch is not set to INCR and it off

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7
Q

Are the ice detection probes heated?

A

Yes auto activated as soon as half a millimetre is detected, then rapidly heated till the ice melts, the heating element turns off allowing further ice build up and the cycle continues if still accumulating ice

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8
Q

Failure of both ice detection probes? What caution light?

A

Caution light ICE DETECT FAIL

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9
Q

How many sets of de icing boots?

A

6 sets
Wing leading edge inner and outer
Horizontal stab
Vertical stab
Inlet lips if the engine nacelles

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10
Q

De ice pressure tolerance?

A

18psi +/- 3

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11
Q

Airframe mode select switch settings?

A

Off
Slow
Fast
Manual

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12
Q

What do the Dual Distribution Valves do?

A

When open inflate the boots and when not inflated use suction to hold the boots flush with the leading edge

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13
Q

What controls the time of the boots?

A

Timer and monitor unit (TMU)

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14
Q

BOOT AIR switch does what?

A

ISO: isolation shutoff valve closed, isolating the left and right side of the airframe in case of a leak
NORM: isolation shutoff valve open, ensures adequate de ice pressure to both airframe sides if you are OEI

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15
Q

How to find a boot leak?

A

Set BOOT AIR switch to ISO and manually cyclic through the boots watching the de ice pressure gauge

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16
Q

If there is a leak in the vertical or horizontal stab can that be isolated with the ISO switch?

A

Not completely. There is a restrictor so loss of system pressure is restricted

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17
Q

Slow boot setting times?

A

3 min total cycle
6 sets for 6 seconds = 36 seconds
Dwell time 2min 24sec

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18
Q

Fast boot setting time?

A

1 min total cycle time
6 sets for 6 secs = 36 sec
Dwell time 24secs

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19
Q

Boot inflation lights do what?

A

Indicate adequate boot pressure of 15.5 psi is inflating the boot

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20
Q

Manual select switch used when?

A

If TMU fails or a system leak

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21
Q

Airframe manual limitations when pilot is doing it?

A

Don’t inflate any boot for longer than 6 seconds
Wait 24 seconds for swell time before starting another cycle

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22
Q

Why is it important to turn the airframe manual switch anti clockwise?

A

Incase there is a boot leak or failure then it prevents a major lateral imbalance if ice sheds from only one side as you cycle through

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23
Q

DEICE PRESS caution light indicates?

A

Loss of pressure in the deice system

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24
Q

How to confirm a boot leak?

A

Select ISO and use the manual airframe selector and cycle through looking at the de ice pressure gauge

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25
Q

DEICE TIMER caution light?

A

TMU failure. De ice system is operable using the manual mode

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26
Q

What powers the prop de ice?

A

L or R variable 115V AC Bus when above 400RPM

27
Q

Propeller selector switch modes?

A

Test
OFF
ON

28
Q

The PROP switch in the ON position means?

A

Propeller de icing is on provided the TAT is at or below 5 degrees.
TAT is warmer than SAT and increases as airspeed increases so at 5 degrees SAT and a high airspeed the prop heaters may not cycle

29
Q

PROP switch set to TEST?

A

Spring loaded. Overrides the TAT. Heating elements cycle for 7 seconds, left then right. 30 seconds between tests to allow props to cool

30
Q

PROP DEICE caution light?

A

TMCU fails or is not powered, if one of more prop blades aren’t heating or a major failure of the prop de ice system occurs

31
Q

Pitot static probes power source?

A

L variable 115V AC bus
R variable 115V AC bus
STBY 28V ess DC bus

32
Q

AoA power source?

A

L and R variable 115V AC bus

33
Q

AoA failure what happens?

A

No caution light for this system is replied on the stall protection system (SPS) and associated caution lights:
#1 or 2 STALL SYST FAIL
PUSHER SYST FAIL

34
Q

Engine intake heaters power?

A

115V variable AC bus

35
Q

During heavy rain what should you do?

A

Open the engine intake doors

36
Q

HTR on engine intake switch lights will illuminate when?

A

• BYPASS DOOR OPEN
• OIL PRESSURE ABOVE LIMITS,
ENGINE RUNNING
• TEMPERATURE BELOW 15.6°C
• AC VARIABLE FREQUENCY POWER AVAILABLE

37
Q

ENG ADPT HEAT 1 / 2 caution light

A

If primary and secondary engine intake heaters fail

38
Q

Engine oil indications shown in yellow when the PROP heat selected to on or test means?

A

The engine oil temp that runs through the engine intake to heat it is inadequate for engine de icing

39
Q

Windshield heat power?

A

L or R variable 115V AC bus

40
Q

How much of the pilots side window is heated with the PLT SIDE WDO/HT switch?

A

Forward 1/3

41
Q

WSHLD CTRL caution light?

A

Failure of the controller that looks after the windshield heating elements

42
Q

WSHLD HOT caution light?

A

Overheat of either windshield. Auto deactivates the affected window heating element

43
Q

SIDE WDO HOT caution light?

A

Side window hot and it is auto deactivated

44
Q

WSHLD CTRL caution light and single chime is heard if?

A

If the windshield heat is not achieved within 5mins of either WARM UP or NORM being selected

45
Q

Alternate wiper switch on capt side does what?

A

Press on operated pilots side wiper at high speed

46
Q

On the ice protection panel, illumination of a wing or tail boot annunciator light indicates the boot

A

Is receiving pressure greater than 15.5psi

47
Q

Illumination of the DEICE PRESS caution light may indicate…

A

All of the above

A boot set has remained inflated
A boot set has not fully inflated
A malfunction in a Dual Distribution Valve (DDV)

48
Q

When the PLT SIDE WDO/HT switch is selected ON, heating elements heat?

A

The front one-third of the left side window only

49
Q

The ice protection system for the propellers uses…

A

AC power

50
Q

The normal position of the boot air isolator shutoff valve is…

A

Opened

51
Q

Illumination of the PROP DEICE caution light can indicate…

A

One or more propeller elements are not heating

52
Q

The modes of operation of the airframe de-icing ar

A

MANUAL, SLOW and FAST

53
Q

The WARM UP position for windshield heat can be used

A

To remove condensation and ice

54
Q

The dwell time between inflation sequenced when SLOW is selected on the AIRFRAME MODE SELECT switch is

A

2 minutes and 24 seconds

55
Q

If a single ice detection probe fails…

A

Ice detection remains available, the ICE PROBE 1 message appears on the lower left of 1

56
Q

Indications of the REF SPEEDS switch being selected to INCR include…

A

The low speed cue moving to a higher indicated airspeed

57
Q

Bleed air for pneumatic boot operation is available…

A

Any time either engine is running

58
Q

For propeller de-icing to operate the propeller RPM must be above…

A

400Np

59
Q

Illumination of the SIDE WDO HOT caution light indicates…

A

The pilot side window has overheated

60
Q

Which of the following is not provided with ‘anti-ice’ protection…

A

Wing leading edges

61
Q

Prior to engine start illumination of the PITOT HEAT STBY caution light…

A

Can indicate the STBY PITOT HEAT switch is selected off

62
Q

With the AIRFRAME MODE SELECT switch in MANUAL, a boot set selection will

A

Keep the boot set inflated as long as the switch position is maintained

63
Q

For the ICE DETECTED message to appear…

A

Either ice detection probe has detected ice

64
Q

With the failure of an electric heater in the engine intake…

A

A secondary electric heater will automatically energise

Q400 (22 decks)

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