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Rotating the APU selector to OFF begins the shutdown cycle by closing the APU bleed air valve. The APU continues running for a cooldown period. The EICAS memo message APU COOLDOWN is displayed during the cooldown period. When the cooldown period finishes, the APU shuts down.

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How long is the cool-down period for the APU attended and unattended modes automatic shutdown?

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What are the conditions for an APU automatic start?

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If AC power is not available or no AC pump pressurizes the left fuel manifold, the DC pump in the right main tank provides APU fuel.

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The DC pump in the left main tank provides APU fuel.

What are the operating limits for the APU Electrical Power and Bleed Air?

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If the APU is in the attended mode, what fault causes an immediate automatic shutdown?

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For the following faults, the APU continues to operate and the EICAS message APU LIMIT displays:

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When the APU air inlet door reaches the full open position the starter engages. After the APU reaches the proper speed, ignition and fuel are provided. When the APU reaches approximately ______, the starter disengages and ignition is turned off.

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Cooldown period when the APU is shut down after the APU LIMIT message is displayed.

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In the attended mode, any of the following faults cause the APU to shut down immediately:

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The APU has attended and unattended operating modes. The attended mode operates when either engine is running or starting, or when the airplane is in flight. The unattended mode operates at all other times on the ground.

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If AC power is not available or no AC pump pressurizes the left fuel manifold, the DC pump in the left main tank provides APU fuel. On the ground, the APU can be started with no pumps operating.

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The electric starter is powered by the APU battery. The main airplane battery powers:

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Boeing B777 – APU