Eliminating the gamble from the 'impossible turn'

Following the NTSB's final report on the 2023 accident in Lake Placid, New York, that claimed the lives of Richard McSpadden and Russ Francis, safety experts are re-examining a recurring killer: the "Impossible Turn." The report detailed a "perfect storm" consisting of a partial power loss, an aircraft operated outside of its forward center of gravity limit, and high density altitude.

The entire Lake Placid flight lasted approximately 62 seconds, a compressed timeline where the human brain is physically incapable of performing mental math. Captain Chesley "Sully" Sullenberger famously noted that the "Startle Factor" can consume 20 to 30 seconds of precious time. In a crisis, pilots simply lack the mental capacity to calculate best glide while simultaneously subtracting the airport's elevation from their current altitude.

This tragedy highlights a deeper issue—the dangerous gap between a pilot's "perceived" altitude and their altitude above the ground. While many height-advisory systems provide audible callouts during landing, they remain completely silent during takeoff and initial climb. Yet, the "Impossible Turn" is fundamentally a takeoff problem. Without audible agl data on the way up, pilots fly on guesswork during the highest-workload minute of the flight.

Real-time audio data can fundamentally alter a pilot's decision-making:

• Immediate performance warning: Hearing altitude callouts later than usual on a hot day provides immediate, audible proof of underperformance.
• The "no-go" discipline: Experts agree 500 feet AGL is the minimum altitude required to attempt an airport return. If an engine falters at 400 feet, real-time data removes reliance on a "gut feeling" and provides the discipline to land straight ahead—a choice the NTSB suggests was highly survivable.

Precision over instinct

To bridge this gap, aviation technology is moving toward "self-aware" cockpits. Systems like the SkyVoice Alert 500 provide a real-time, audible "climb-out scorecard." Julian Johnson, flying out of Ocala, Florida, uses these announcements to establish a performance baseline that standard, lagging altimeters cannot match.

Beyond altitude, the Lake Placid report highlighted an "aggressive use of flight controls" leading to an aerodynamic stall. Operating with a forward CG requires increased "tail-down force," making the airplane effectively heavier and forcing a higher angle of attack, which creates massive induced drag.

To counter this, Frank Kunnumpurath, founder of Holy Micro! LLC, pioneered a Pressure Ratio-based Absolute AoA system. Unlike old-school pressure differential systems that rely on a mechanical reed or simple differential to provide a binary warning only near a stall, this system utilizes 100Hz pressure ratio sampling. This allows the technology to provide continuous data for best approach, best glide, best range, and proactive stall prevention.

Measuring the pressure ratio with 1-pascal resolution provides an early-warning signal that the wing is working too hard before an emergency even begins. Johnson prefers flying the wing's actual health over "speed memory drills," while Dred Roberts of Fredericksburg, Virginia, notes the system's quick response captures loss of lift during turns instantly. Ultimately, resolving 1 pascal detects slight changes in wing loading long before the pilot feels it in the yoke. By replacing instinct with real-time precision, these tools give pilots the hard physics to override dangerous impulses and stay alive.

Author Ian Minushkin is a certificated commercial pilot with an instrument rating and more than 2,000 hours.