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787 > CH3 ANTI ICE RAIN > Flashcards

CH3 ANTI ICE RAIN Flashcards

1
Q

What does the OFF position of the WING ANTI-ICE Selector indicate?

A

The wing ice protection system is not powered

With flaps out of up, stick shaker logic returns to normal if no icing conditions have been detected for a certain time and TAT is greater than 10° C.

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2
Q

How is the WING ANTI-ICE Selector switched to OFF?

A

The switch must be pulled during rotation from AUTO to OFF

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3
Q

What happens when the WING ANTI-ICE Selector is in AUTO position?

A

The wing ice protection system is powered on and off automatically

WITH FLAPS OUT OF UP
Stick shaker logic is set for icing conditions when icing conditions have been detected and TAT is 10° C or less.

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4
Q

What is the function of the ON position in the WING ANTI-ICE Selector?

A

The wing ice protection system is powered on and operates without input from automatic ice detection system TAT less than 25° C.

WITH FLAPS OUT OF UP STICK SHAKER LOGIC IS SET FOR ICING CONDITIONS

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5
Q

What occurs to stick shaker logic when the airplane lands?

A

Stick shaker logic returns to normal regardless of switch position

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6
Q

What does the OFF position of the ENGINE ANTI-ICE Selector indicate?

A

The engine anti-ice valves are commanded closed

With flaps out of up, stick shaker logic returns to normal if no icing conditions have been detected for a certain time and TAT is greater than 10° C.

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7
Q

What happens when the ENGINE ANTI-ICE Selector is in AUTO position?

A

The engine anti-ice valves are opened or closed automatically by the ice detection system

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8
Q

Fill in the blank: The stick shaker logic is set for icing conditions when TAT is ______.

A

10° C or less

WITH FLAPS OUT OF UP

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9
Q

True or False: In the ON position of the WING ANTI-ICE Selector, the system requires input from the automatic ice detection system.

A

False

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10
Q

What condition prompts stick shaker logic to return to normal with the wing anti-ice system?

A

No icing conditions have been detected for a certain time and TAT is greater than 10° C

This applies when flaps are out of up.

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11
Q

What does the Anti-Ice Panel indicate when ON?

A

The engine anti-ice valves are commanded open and stick shaker logic is set for icing conditions

Stick shaker logic returns to normal when the airplane lands, regardless of switch position.

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12
Q

What happens to the stick shaker logic when the flaps are out of up?

A

It is set for icing conditions.

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13
Q

What does a displayed (green) Engine Anti-ice Indication (EAD) mean?

A

The engine anti-ice system is on.

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14
Q

What does the OFF position indicate for the BACKUP WINDOW HEAT switch?

A

The backup window heat anti-fogging system is off.

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15
Q

What happens when the BACKUP WINDOW HEAT switch is in the ON position?

A

Backup window heat anti-fogging is commanded on for the selected windows if the primary window heat system fails.

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16
Q

What does the ON position of the WINDOW HEAT switch signify?

A

Window heat is applied to the selected windows.

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17
Q

What does an illuminated INOP (inoperative) indicator on the WINDOW HEAT switch mean?

A

It indicates that either the switch is off, an overheat is detected, or a system fault has occurred.

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18
Q

What are the positions of the WIPER Selectors?

A
  • OFF
  • INT (intermittent)
  • LOW
  • HIGH

OFF means the wiper is stowed vertically; INT means the wiper operates intermittently; LOW means the wiper operates at low speed; HIGH means the wiper operates at high speed.

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19
Q

What does the WASHER Switch do?

A

Push (momentary action) - fluid is sprayed on windshield until switch is released

This means the washer operates only while the switch is being pressed.

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20
Q

List the components included in the anti-ice and rain systems.

A
  • automatic ice detection
  • engine anti-ice
  • wing anti-ice
  • pack inlet anti-ice
  • flight deck window heat
  • windshield wipers and washers
  • probe heat
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21
Q

What is the function of the automatic ice detection system?

A

It senses the existence of icing conditions and provides signals to control the engine, wing, and pack inlet anti-ice

The system uses two icing condition detectors that measure liquid water content.

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22
Q

What data do the icing condition detectors use to determine if icing conditions exist?

A

TAT and other data information and temperature sources

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23
Q

What happens to the icing condition detectors after engine start?

A

Both detectors are heated electrically

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24
Q

What EICAS message is displayed if the automatic ice detection system fails?

A

ICE DETECTORS

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25
Q

When is automatic ice detection inhibited?

A

On the ground below 75 knots

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26
Q

What does the engine anti-ice system use to provide protection?

A

Bleed air

The engine anti-ice system provides ice protection for the engine core and cowl inlet.

27
Q

When can the engine anti-ice system be operated?

A

In flight or on the ground

28
Q

How is engine anti-ice indication displayed?

A

Above the EICAS N1 indication

This indicates when an engine anti-ice valve is open.

29
Q

What allows the remaining engine anti-ice system to operate if one engine is shutdown?

A

Identical, independent anti-ice systems

Each engine has its own system that operates independently.

30
Q

What happens when the ENGINE ANTI-ICE selector is in AUTO during flight?

A

Operation is automatic

The system will automatically open valves when icing conditions are detected.

31
Q

What occurs when icing conditions are no longer detected?

A

Engine anti-ice valves close

Bleed air is no longer supplied to the engine core and inlet cowl.

32
Q

Is automatic operation of the engine anti-ice system enabled on the ground?

A

No

33
Q

What does the ice detection system use to determine total air temperature?

A

A combination of temperature sources

THE REFERENCE TEMP MAY BE DIFFERENT TO THE DISPLAYED TAT

34
Q

What happens when the ENGINE ANTI-ICE selector is ON?

A

Bleed air opens the engine anti-ice valves

AIR SUPPLIED TO THE ENGINE CORE AND INLET COWL

35
Q

When do engine anti-ice valves close automatically?

A

During start, bleed air overtemperature, bleed air overpressure, engine fire switch pulled, or bleed air leak detected

36
Q

What does the GE engine EEC do to help prevent engine icing?

A

Automatically adjusts idle

This adjustment helps mitigate adverse engine effects during Ice Crystal Icing conditions.

37
Q

What is the primary function of the GE engine EEC regarding engine icing?

A

Automatically adjusts idle to help prevent engine icing and mitigate engine effects during Ice Crystal Icing conditions.

38
Q

What happens when an anti-ice duct leak is detected?

A

The respective engine anti-ice valves close.

39
Q

What powers the thermal anti-icing mats on the leading edge slats of each wing?

A

The electric wing anti-ice system.

40
Q

When is wing anti-ice inhibited on the ground?

A

Below 75 knots.

41
Q

How long may wing anti-ice be momentarily shed during high electrical loads?

A

30 seconds maximum.

42
Q

What occurs if one wing anti-ice thermal mat fails?

A

The opposite thermal mat is automatically de-powered to prevent asymmetrical wing icing.

43
Q

Where is the wing anti-ice annunciation displayed?

A

Below the EICAS N1 indication.

44
Q

In flight, what does the WING ANTI-ICE selector in AUTO mode do?

A

Automatically powers the wing anti-ice system when icing conditions are detected.

45
Q

What occurs during the clean-up cycle of the wing anti-ice system?

A

Continues to provide electrical power to heated slats to clear residual ice.

46
Q

When is automatic wing anti-ice operation available?

A

In flight and on the ground above 75 knots airspeed.

47
Q

In flight with the WING ANTI-ICE selector ON, when is the system powered?

A

Any time TAT is below 25° C.

48
Q

How does engine or wing anti-ice use affect stick shaker logic?

FLAPS OUT OF UP

A

Increases stick shaker speed and minimum manoeuvring speed, reducing manoeuvre margin.

49
Q

What conditions return stick shaker logic to normal after anti-ice use?

A

No icing conditions detected for a certain time and TAT greater than 10° C, or when the airplane lands.

50
Q

What effect does engine or wing anti-ice have on manoeuvre margin with flaps out of up?

A

It modifies stick shaker logic, increasing stick shaker speed and minimum manoeuvring speed, reducing manoeuvre margin to stick shaker.

51
Q

What is the effect of engine or wing anti-ice on stick shaker speed with flaps up?

A

There is no effect on stick shaker speed and minimum manoeuvring speed.

52
Q

What does the pack inlet anti-ice system provide protection for?

A

Ice protection for both ram air inlets for the cabin air compressors.

53
Q

How does the pack inlet anti-ice system prevent ice formation?

A

An electric heater on the leading edge of each inlet prevents ice formation and reduces ice formation in the duct.

54
Q

When does the pack inlet anti-ice system operate?

A

Automatically with signals from the automatic ice detection system, inhibited on the ground and when TAT is above 10° C.

55
Q

What type of heating is provided for flight deck windows?

A

All flight deck windows are electrically heated.

56
Q

What protection do the forward windows have?

A

Exterior surface anti-icing and interior surface antifogging protection.

57
Q

What protection do the side windows have?

A

Interior surface antifogging protection only.

58
Q

What happens when the BACKUP L FWD and R FWD switches are in the ON position?

A

A backup antifogging system for the forward windows operates automatically if the primary system fails.

59
Q

How are the windshield wipers controlled?

A

Independently controlled with three-speed settings.

60
Q

What occurs if windshield wipers are used on a dry windshield surface?

A

Windshield scratching may occur.

61
Q

When does the probe heat system provide anti-ice protection?

A

When either engine is operating.

62
Q

How many pitot probes are electrically heated for anti-ice protection?

A

Three pitot probes and two angle of attack probes.

63
Q

What additional probe is electrically heated for anti-ice protection in flight?

A

The total air temperature probe.

787 (31 decks)

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