Humbling Flight: Structural Ice Can Be Unpredictable and Unforgiving

Close call shows unpredictable and unforgiving nature of in-flight structural phenomenon.

Wednesday, September 03, 2025 at 08:00 AM ET

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A close call with experienced by the author shows unpredictable and unforgiving nature of in-flight structural ice phenomenon. [Illustration: Joel Kimmel]

Key Takeaways:

A seasoned pilot's initial overconfidence in handling structural icing was challenged by an unexpectedly rapid and severe ice accumulation in seemingly benign conditions.
The flight quickly turned critical as "ice horn" formation and propeller icing dramatically degraded the aircraft's performance, turning a climb into a rapid descent despite full power.
The pilot's quick decision-making, including delaying landing gear extension to minimize drag, enabled a challenging but safe emergency return and landing.
This near-catastrophic experience served as a stark lesson on the unpredictability and unforgiving nature of structural icing, leading to a more conservative flight approach and a focus on human factors in aviation safety.

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Having flown many thousands of hours in the clouds of the Northeast, I used to believe that I had all the answers in dealing with structural ice. I admit to being very aggressive, flying into conditions that were likely to produce ice in airplanes with and without ice protection. In my experience, ice usually formed rather slowly and that changing altitude by just a couple thousand feet would take care of any icing problems.

My attitude changed one day in early May 2000 when I took off from Utica, New York, for a flight to Nashua, New Hampshire (KASH), in a Piper Seneca I without ice protection. I was alone in the airplane with no baggage. Even with full fuel, I was well below the maximum allowable gross weight and should have been able to climb very well.