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Refer to figure.
Using the Landing Performance chart, what is the approximate landing distance over a 50 ft obstacle?

Airfield elevation = 940 ft
QNH = 1011 hPa
OAT = +26°C
Weight = 2150 lbs
7 kt headwind

  • A

    1100 ft

  • B

    1045 ft

  • C

    1160 ft

  • D

    1010 ft

Refer to figure.
Step 1: Calculate pressure altitude

The pressure difference between actual QNH and standard is 1011 - 1013 = -2 hPa.

Each 1 hPa below standard increase the pressure altitude by approximately 30 ft, so the correction is +2 × 30 = 60 ft to add to the elevation.

Pressure altitude = 940 + 60 = 1000 ft

Step 2: Draw on chart

Entering the chart at +26°C, projecting up to the pressure altitude of 1000 ft, carrying horizontally to the 2500 lbs weight reference, and then adjusting the weight down to 2150 lbs using the diagonal weight lines shifts the reference point left by a meaningful amount. 

Finally, a 7 kt headwind correction is applied, further reducing the distance. 

The correct answer is 1100 ft.

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