Anti-ice Flashcards

1
Q

Describe the anti-ice system.

A

Nacelle and wing anti-icing is provided by distributing engine bleed air to the nacelle inlets and to the wing leading edges. Bleed air is not available for nacelle anti-icing if the engine bleed PRV is closed.

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2
Q

When is NAI required?

A

When icing conditions exist:
1. OAT 10C or below in visable moisture or
dew point spread < 3
C, contaminated
taxiways or runways.
2. During descent even with SAT < -40*C for
engine flameout mitigation.

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3
Q

When is an engine runup required and what is the procedure for a 900 series (GE engines) aircraft?

A

An engine runup is required when NAI is required and OAT < 3*C.
Then procedure is runup the engine to a minimum of 60% N1 for approximately 30 sec at intervals no greater than 30 mins.
(PW engine is min 50% N1 for approx 1 sec at intervals no greater than 15 mins)

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4
Q

What is the indication(s) that NAI is operating?

A

Green NAI indication adjacent to the respective N1 indicator on the primary (upper) EICAS.

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5
Q

Will WAI operate on the ground?

A

No, on the ground the system is off and the WAI valves are closed.

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6
Q

Does the WAI operate in-flight with the LE flap extended?

A

Yes but is ineffective.

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7
Q

When are the pitot static and AOA probes heated?

A

When any engine is running.

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