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The tip-back angle is measured between

  • A.The wing chord and the runway
  • B.The nose and main gear contact points
  • C.The vertical at the main wheels and the line to the CG
  • D.The runway and the rear fuselage underside

Answer: C

Correct answer: The vertical at the main wheels and the line to the CG

The tip-back angle is measured at the main wheel contact point, between the vertical and the line running up to the centre of gravity.

It states how far the aircraft can rotate nose-up before the centre of gravity passes behind the wheels and the aircraft sits on its tail. The requirement is that it exceed the attitude needed at rotation, with a margin - typically 15 degrees or more - and it is checked at the most aft centre of gravity, where the angle is smallest.

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