From which tank is the APU's fuel supplied?

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Multiple Choice

From which tank is the APU's fuel supplied?

Explanation:
The APU is designed to run off a dedicated fuel feed, typically taking fuel from the left collector tank. This arrangement keeps the APU supply independent from the engine fuel system, ensuring the APU can operate reliably even as engine fuel levels and crossfeeds change. The left collector tank is the source connected to the APU's pump and valve, so fuel for the APU comes from there. The right collector tank serves the other side’s feeds and is not the normal source for the APU. The main fuel tanks feed the engines and only supply the APU through normal crossfeed arrangements when specifically routed by the fuel system switch, which is not the standard APU supply path in normal operations. An external supply is typically only used on the ground for testing or maintenance, not during normal flight operations.

The APU is designed to run off a dedicated fuel feed, typically taking fuel from the left collector tank. This arrangement keeps the APU supply independent from the engine fuel system, ensuring the APU can operate reliably even as engine fuel levels and crossfeeds change. The left collector tank is the source connected to the APU's pump and valve, so fuel for the APU comes from there.

The right collector tank serves the other side’s feeds and is not the normal source for the APU. The main fuel tanks feed the engines and only supply the APU through normal crossfeed arrangements when specifically routed by the fuel system switch, which is not the standard APU supply path in normal operations. An external supply is typically only used on the ground for testing or maintenance, not during normal flight operations.

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