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A Wing and a Prayer

Taking a Pilatus PC-12 aft of the limit spells disaster.

The Pilatus roared down Runway 31, lifted off, banked to the left, and faded from sight in the snow and mist. [Credit: Adobe Stock]
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Key Takeaways:

  • The NTSB determined the crash was primarily caused by the pilot's improper loading, with the airplane 107 pounds over gross weight and its center of gravity several inches behind the aft limit.
  • This severe aft loading led to reduced static longitudinal stability, making the Pilatus PC-12 difficult to control in low instrument meteorological conditions, with stall warnings activating immediately after liftoff.
  • Contrary to initial appearances and the pilot's de-icing efforts, NTSB simulations concluded that the remaining snow and ice on the aircraft did not significantly degrade its performance or contribute to the accident.
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It was a snowy late-November morning at Chamberlain, South Dakota (9V9). A Pilatus PC-12 had sat out on the ramp during a night of intermittent snowfall and freezing drizzle. Its passengers, who had flown in from Idaho Falls the previous day to hunt pheasants, planned to return home that day.

While the rest of the party was out shooting, the private pilot, 48, and one companion got some isopropyl alcohol de-icing fluid from a hardware store, borrowed a ladder from the hunting lodge at which they had stayed, and spent three hours chipping snow and ice from the wings. The ladder was not tall enough to allow them to reach the upper surface of the T-tail, but the pilot was satisfied that the rest of the airplane was sufficiently clean.

Peter Garrison

Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.

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