Given the following data, calculate take-off ground roll required.
Pressure altitude: 5000 ft
Weight: 2400 lbs
Remperature: +15°C
RWY dry, grass runway
10 kts headwind
Refer to figure.
Step 1: Read GND ROLL at PA 5000 ft, +15°C
Interpolate between 10°C (GND ROLL = 1340 ft) and 20°C (GND ROLL = 1440 ft).
At 15°C: (1340 + 1440) / 2 = 1390 ft.
Step 2: Apply headwind correction to GND ROLL
10 kt headwind = 2 x 10% = 20% decrease.
1390 x 0.80 = 1112 ft.
Step 3: Apply grass correction
Grass addition = 10% of corrected GND ROLL = 1112 x 0.10 = 111 ft.
Total GND ROLL with grass = 1112 + 111 = 1223 ft
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