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The Impossible Turn

This magazine often has discussed the so-called impossible turn: returning to the departure runway and landing downwind after an engine failure during takeoff. Our view of the impossible turn is that it is possible, but only with practice, sufficient altitude and some luck. Generally, executing a forced landing straight ahead is preferable to attempting a steeply banked turn at low altitude. This is especially true without engine power or sufficient airspeed above the wings stalling angle of attack to enable the steep turn.

Gemini Sparkle

Key Takeaways:

  • The "impossible turn," a maneuver to return to the departure runway after an engine failure during takeoff, is highly risky due to low altitude, limited energy, and the need for steep, multiple turns.
  • A straight-ahead forced landing is generally preferable to attempting a turn back to the runway, especially without sufficient airspeed or engine power.
  • While partial engine power might enable a return to the runway, it requires careful judgment and gentle handling to avoid a dangerous stall/spin.
  • A fatal accident demonstrated these risks when a pilot, experiencing partial engine failure due to an improper repair, stalled and crashed attempting a steep turn back to the airport.
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This magazine often has discussed the so-called impossible turn: returning to the departure runway and landing downwind after an engine failure during takeoff. Our view of the impossible turn is that it is possible, but only with practice, sufficient altitude and some luck. Generally, executing a forced landing straight ahead is preferable to attempting a steeply banked turn at low altitude. This is especially true without engine power or sufficient airspeed above the wing’s stalling angle of attack to enable the steep turn.

One problem with trying to return to the departure runway in such an event is the inevitable delay in accepting the engine failure and making the decision to attempt the maneuver. Precious seconds and energy are lost while the pilot processes the situation and decides how to respond. By then, the airplane is even further away from the runway, and perhaps even lower and slower.

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