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When are the auxiliary fuel pumps installed on single-engine low-wing aeroplanes typically used?

1. during take-off.
2. during cruise.
3. during landing.
4. in emergency situations.
5. in case of a suspected vapour lock.
6. in case of failure of the engine fuel pump.

  • A
    1, 3, 4 and 5.
  • B
    1, 2, 3, 4 and 5.
  • C
    1, 3, 4, 5 and 6.
  • D
    1, 2, 3, 4, 5 and 6.
Single engine piston aircraft feature additional fuel pumps called auxiliary pumps. Such pumps are not engine-driven but usually require electrical power. Auxiliary pumps are connected in parallel to the main fuel pumps and serve as a backup in case of failure of a main pump. They are required to be switched on in normal operation for take-off and landing only and are switched off in cruise. In abnormal conditions, such as a main pump failure or suspected vapour lock, or in any emergency situation, the auxiliary pumps are switched on.

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