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Fuel icing (avgas)

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Fuel icing (avgas)

Old 15th Apr 2022, 03:06
  #41 (permalink)  
Join Date: Aug 2006
Location: Ontario, Canada
Age: 62
Posts: 5,590
Received 56 Likes on 40 Posts
During the early phases of Mogas flight testing here in Canada, "fuel containing alcohol" was prohibited. Like a silly person, I stopped adding deicing alcohol. You'd think that after my first iced fuel forced landing I'd have figured out my error, but I actually had two (C 182, and C150). Luckily I got onto a suitable runway each time, so no "event". Transport Canada rapidly exempted deicing alcohol from the prohibition on alcohol in fuel when I made my second report.

It's a thing in some types. Be extra aware of the flush fuel caps (the GABB type, for example) common on many GA types. They have an O ring around the periphery, which will crack over time, and allow small amounts of water to weep into the tank, which may later freeze at altitude. Mogas/Avgas, same outcome. So consider deicing alcohol even on above freezing days, if you think you might be climbing for a prolonged time above the freezing level.
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