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Refer to figure.
An aircraft will climb from FL65 to FL95. Given the following data, determine the distance to climb.

Aircraft mass: 3000 lb
OAT at FL65: -5°C
OAT at FL95: -15°C

  • A

    6 NM

  • B

    3 NM

  • C

    16 NM

  • D

    10 NM

Refer to figure.
In order to calculate the distance to climb from FL65 to FL95 from the performance table, we need to find the data for both FL65 and FL95, and then deduct.

Data for FL65 (red path on the graph):

  1. On the left side of the table, locate the Outside Air Temperature of -5°C.
  2. Draw a line upwards from the point of outside air temperature of -5°C until the the Pressure Altitude of 6500 ft (slightly higher than the Pressure Altitude line of 6000 ft).
  3. From that point draw a line towards the right until it reaches the 3000 lb mass line.
  4. From that point draw a line downwards and read a fuel of 2 GAL and a distance of 10 NM.

Data for FL95 (blue path on the graph):

  1. On the left side of the table, locate the Outside Air Temperature of -15°C.
  2. Draw a line upwards from the point of outside air temperature of -15°C until the the Pressure Altitude of 9500 ft (between 8000 ft and 10 000 ft pressure altitude lines).
  3. From that point draw a line towards the right until it reaches the 3000 lb mass line.
  4. From that point draw a line downwards and read a fuel of 3 GAL and a distance of 16 NM.

Therefore, the distance to climb will be 16 NM - 10 NM = 6 NM.

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