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Unknown Icing Conditions

Gemini Sparkle

Key Takeaways:

  • A private pilot crashed a Cirrus SR22 in Donner Pass due to severe icing after repeatedly climbing into worsening conditions.
  • Despite an "icing protection system" and being prohibited from known icing, the pilot's decision to climb rather than descend led to an unrecoverable loss of control.
  • An inaccurate weather forecast underestimating icing severity was a factor, but the NTSB cited the pilot's loss of control as the primary probable cause.
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A 473-hour instrument-rated private pilot, alone in a fully fueled Cirrus SR22-G2, took off from Reno, Nevada, early on a Sunday evening in February 2005. The sun had set half an hour earlier; the moon, above a layer of clouds, was a mere sliver. He had filed an IFR flight plan via Truckee and Sacramento with a destination of Oakland, California, 155 nm to the southwest. The cruising altitude was to be 12,000 feet. Reno, where the field elevation is 4,415 feet, was reporting an overcast at 5,500 feet, light winds, and a surface temperature of 6º Celsius with a 7º temperature-dew point spread. The pilot’s weather briefing, obtained from an FSS briefer an hour before the flight, put the freezing level at 6,000 feet and reported no precipitation in the area. No pilot reports were available for the route. When he filed his flight plan, the pilot told the briefer that he might request 14,000 once airborne.

The pilot contacted Oakland ARTCC as he climbed through 10,600 feet on the way to 14,000. A couple of minutes later he requested a clearance to climb to 16,000, in order to “see if I can get above these clouds.”

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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