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Which of the following statements is/are correct as regards a synchroscope on a multi-engine aircraft? A synchroscope is used to…

1. reduce structural vibration and noise
2. achieve symmetrical thrust and fuel consumption

  • A
    Both 1 and 2 are incorrect.
  • B
    1 is correct, 2 is incorrect.
  • C
    Both 1 and 2 are correct.
  • D
    1 is incorrect, 2 is correct.
  • Reduce Structural vibration and noise – CORRECT. On propeller-driven multiengine aircraft, even a slight difference in RPM can create uncomfortable noise and vibrations. The noise can be uncomfortable for the flight/cabin crew and the passengers. Continuous exposure to vibrations may induce early fatigue to the airframe.
  • Achieve symmetrical thrust and fuel consumption – INCORRECT. This statement is a bit unclear as technically if you synchronize your engine RPMs, they will provide symmetrical thrust and the fuel consumption on both engines (or more) is going to be the same. However, the synchroscope is used to synchronize the engines, not the fuel.

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