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KEY LIME STUDY 2019 > ORAL *145 Ice and Rain Protection > Flashcards

ORAL *145 Ice and Rain Protection Flashcards

1
Q

Which areas are heated by bleed air?

A

Wing and horizontal stab leading edges

Engine - air inlet lips

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2
Q

Which areas are heated electrically?

A 
Windshields
Pilot tubes, and Pitot-static tube
AOA sensors, and TAT probes
ADC and Pressurization static ports
Lavatory water drain, and Water supply service nipples
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3
Q

When are the ice protections systems (with exception of windshield heat) turned on?

A

Automatically when ice is detected by either by either ice detector

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4
Q

How is ice protection turned on manually?

A

OVERRIDE knob to ALL

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5
Q

Any restrictions or limitations on using engine inlet anti-icing on the ground?

A

No, engine inlet has enough airflow surrounding the lip

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6
Q

Which side of pneumatic system supplies horizontal stab anti-icing?

A

Left side

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7
Q

FADECs ensure minimum available thrust when ice detected, even during low thrust settings. When is this logic inhibited?

A

When landing gear is extended.

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8
Q

Can APU bleed air be used for anti-icing?

A

No, it is not hot enough

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9
Q

When do wing and stabilizer anti-icing valves open?

A

Ice Detection Test Knob is set to 1 or 2,
OR
Inflight or on ground >25 kts, AND
Ice Detection Override knob set to All
OR
Ice Detection Override Knob set to AUTO or ENG and ice is detected

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10
Q

How many seconds should ice detection test be limited to?

A

15

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11
Q

When do engine anti-ice valves open?

A

Ice Detection Test Knob is set to 1 or 2
Ice Detection Override knob set to ALL or ENG
Ice Detection Override Knob set to AUTO and ice is detected

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12
Q

When should PPG Windshield heat be turned on?

A

It may be turned on anytime

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13
Q

When are Pitot, Pitot-Static, AOA, and ADC and Pressurization Static ports heated?

A

Whenever at least one engine is running (N2 >56.4%)

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14
Q

When are TAT probes heated?

A

When thrust levers above > 65% TLA, or when airplane is airborne

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15
Q

When are lavatory waste water drain and water service nipples heated?

A

When DC Bus 1 powered

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16
Q

What is indication that Engine Anti-Ice Valve is open?

A

OPEN legend illuminated in associated push button on ICE PROTECTION Panel

17
Q

What does the PITOT 1/TAT 1/ AOA 1 push button control?

A

Controls heating to these sensors

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18
Q

What does the Ice Detection Test Knob do when selected to 1 or 2?

A

Simulates icing conditions on associated detector.

19
Q

When is an ice protection test required?

A

Once a day (not necessarily the first flight of day) when icing conditions are forecast.

20
Q

When is Ice Protection Test A required?

A

For takeoffs when icing conditions exist or are anticipated for takeoff or climb.

21
Q

Perform icing test A

A

a. Thrust ……………………………..83% N2 (min)
b. Ice Detection Override knob … ………..ALL
c. Anti-Icing buttons (eng, wing, stab) … IN dark
d. Ice Detection Test knob ………………….1(2)
e. Thrust Levers ………………………………..IDLE
f. Ice Detection Override knob…ENG or AUTO

22
Q

During an icing Test A, what indications should you see?

A

a. OPEN lights on each push button,
b. ICE DET 1(2) FAIL caution
c. BLD 1(2) LOW TEMP caution
d. ICE CONDITION advisory
e. maybe CROSS BLD OPEN advisory

23
Q

How long should Ice Detection Test knob be held in 1(2) position?

A

At least 10 secs, no more than 15 secs

24
Q

How long should you wait after releasing the Ice Detection Test knob before testing the other side?

A

Until all the Test A EICAS messages no longer displayed

25
Q

If Ice Test A unsuccessful, what should be done?

A

Thrust Levers set to idle, and do a second test following same procedure

26
Q

What does ENG on the Ice Protection Override knob do?

A

Turns on engine air inlet anti-icing for ground speeds below 25 knots.
Above 25 knots, the wing and horizontal stabilizer anti-icing systems are also turned on if icing conditions are detected.

27
Q

What happens if ice is detected by ice detection system 1or 2?

A

a. the bleed air anti-icing system activates automatically
b. an SPS angle of attack set values reduction
c. an advisory message on the EICAS

28
Q

When ice is detected, how long does the icing signal remain active?

A

60 seconds

29
Q

When ice is detected, how is the ice removed from the probe?

A

An internal ice detector heater is activated to deice the probe. When the probe’s natural frequency is recovered, heating is de-energized.

30
Q

What is the maximum temperature for anti-icing operation?

A

10 deg C

31
Q

What is the minimum temperature for manual anti-icing operation?

A

-40 deg C

32
Q

What is the maximum altitude for operation with a single engine or single bleed in icing conditions?

A

15,000 feet

33
Q

What is the required holding configuration and icing conditions?

A

Gear up, Flaps up, minimum airspeed 200 KIAS

34
Q

Define icing conditions.

A

Icing conditions may exist whenever static air temperature (SAT) on the ground or for takeoff, or total air temperature (TAT) in flight, is 10° C or below and visible moisture in any form is present (such as clouds, fog with visibility 1 mile or less, rain, snow, sleet, and ice crystals).
Icing conditions may also exist when the SAT on the ground and for takeoff is 10° C or below when operating on ramps, taxiways, or runways where surface snow, ice, standing water, or/maybe ingested by the engines or freeze on the engines, nacelles, or engine sensor probes.

35
Q

What is the maximum windshield wiper operating speed?

A

170 KIAS

36
Q

What does the AUTO position of the ice detection override knob do?

A

Allows automatic operation of the bleed air anti-icing system. If ground speed is >= 25 knots and icing condition is detected, wing and horizontal stabilizer anti-icing systems are turned on.
Engine anti-icing is turn on as soon as an icing condition is detected, regardless of speed.

37
Q

What does the ALL position of the ice detection override knob do?

A

Turns on the complete bleed air intake Anti-Icing system if the airplane is on the ground and ground speed is equal or above 25 knots, or in-flight.
On the ground, below 25 knots, only engine anti-icing is turned on.

KEY LIME STUDY 2019 (22 decks)

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