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Real-World Takeoff Performance

1) A Piper PA-32R-300 Lance attempted to take off from a 3200-foot-long grass runway on a June morning with flaps retracted. It lifted off at the end of the runway, then descended into a shallow valley, touched down and lifted off a second time, before settling back to the ground and colliding with a barbed-wire fence. It was later determined to have been 188 pounds over its maximum gross weight with its center of gravity 0.15 inches aft of limits. Density altitude was about 1800 feet above field elevation.

Gemini Sparkle

Key Takeaways:

  • Many pilot accidents, especially during takeoff, result from a critical misunderstanding of their aircraft's actual performance capabilities, often failing to account for variables like weight, density altitude, and runway conditions.
  • Pilots should view Pilot's Operating Handbook (POH) performance figures as optimistic ideals derived from factory test flights, requiring the application of "fudge factors," precise adherence to configuration, and a conservative approach.
  • To ensure safe takeoffs, pilots are advised to proactively conduct "sensitivity analysis" with POH data, perform personal flight tests to establish realistic performance margins, and exercise extra caution with non-standard aircraft or high-altitude operations.
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Time for a pop quiz: What do these three accidents have in common? (Our descriptions omit the phrase “the pilot of” as redundant.)

1) A Piper PA-32R-300 Lance attempted to take off from a 3200-foot-long grass runway on a June morning with flaps retracted. It lifted off at the end of the runway, then descended into a shallow valley, touched down and lifted off a second time, before settling back to the ground and colliding with a barbed-wire fence. It was later determined to have been 188 pounds over its maximum gross weight with its center of gravity 0.15 inches aft of limits. Density altitude was about 1800 feet above field elevation.

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