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Refer to figure or CAP file 3.10.
Given the following information, calculate the barrier speed for this multi-engine piston aeroplane.

Pressure altitude: 4000 ft
Outside air temp.: 10°C
Aircraft mass: 3450 lb

  • A

    77 kt

  • B

    72 kt

  • C

    74 kt

  • D

    76 kt

Refer to figure.

This question is much easier than it initially looks. The barrier speed is the expected speed that the aircraft will be flying when passing over the 50 ft obstacle at the end of the take-off distance used. It is directly related to aeroplane mass only. A mass of 3450 lb gives a barrier speed of 72 kt.

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