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Given the following data, calculate take-off ground roll required.

Pressure altitude: 3500 ft
Weight: 2400 lbs
Temperature: +20°C
4 kt tailwind

  • A

    1500 ft

  • B

    1385 ft

  • C

    1620 ft

  • D

    1445 ft

Refer to figure.
Step 1: Read GND ROLL at PA 3500 ft, +20°C

Interpolate between 3000 ft (GND ROLL = 1190 ft) and 4000 ft (GND ROLL = 1310 ft) at 20°C.

At 3500 ft: (1190 + 1310) / 2 = 1250 ft.

Step 2: Apply tailwind correction to GND ROLL

4 kt tailwind = 2 x 10% = 20% increase.

1250 x 1.20 = 1500 ft.

Step 3: Grass runway

The question does not specify grass. 

Paved (base conditions) = no additional grass correction.

GND ROLL = 1500 ft

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