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Wintertime Partial Panel in IMC

Gemini Sparkle

Key Takeaways:

  • The pilot experienced an intermittent autopilot malfunction early in a challenging winter flight to Lebanon, NH, a destination known for hazardous terrain and complex instrument approaches.
  • During the instrument approach in poor weather, the autopilot fully disconnected and the primary HSI (compass/navigation display) failed, forcing the pilot to hand-fly a complex procedure turn using backup instruments and a moving map display.
  • Despite significant instrument failures, the pilot successfully navigated the difficult approach, underscoring the critical importance of redundant aircraft systems and pilot proficiency in handling in-flight emergencies.
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For many years the instrument approach plates for Lebanon, New Hampshire, posted an ominous footnote: “Caution-hazardous terrain all quadrants.” For some reason this warning no longer appears, though I’m reasonably certain the mountains haven’t moved much. There still isn’t any radar coverage in the area and many of the approaches feature old-fashioned procedure turns. This is the only place we go regularly where our approaches are unsupervised by helpful controllers.

It is a few days before Christmas as I preflight our Cheyenne in Tampa in preparation for the trip to New Hampshire. DUATS has predicted a flight time of four hours and 38 minutes for the 1,100-nautical mile flight. This tells me that there isn’t much help from the winds. The forecast is for overcast skies with limited visibility due to haze and mist until 5 p.m. After that freezing rain and lowering ceilings are in the cards. Since our endurance is five and a half hours, I accept the need for a fuel stop. Sometimes we go non-stop, but only when the destination weather is clear and we get a little bit better boost from the winds.

Dick Karl

Dick Karl is a cancer surgeon who appreciates the beauty and science involved in both surgery and flying. Dick’s monthly Gear Up celebrates the human side of flying. He writes about his enthusiasm for both the machines and the people who fly and maintain them.

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