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Rx for Overactive Vents

Aftermarket bladder tanks on a Mooney protect
the vent with a streamlined ice catcher.

(Photo by Robert Takacs)
Gemini Sparkle

Key Takeaways:

  • An unexpected overnight fuel leak occurred from the author's parked airplane, caused by a slight tilt from uneven landing gear and fuel distribution, which allowed fuel to flow out the wing vent.
  • The author discovered this issue is not unique, as similar fuel spills are a known problem for aircraft with narrow landing gears, fuel carried outboard in wings, and small dihedral angles.
  • The root cause is the low placement of fuel tank vents relative to full tanks and slight aircraft listing, leading the author to plan a modification to extend the wingtip vents upwards.
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The day began benignly enough. I flew to Las Vegas in midmorning to pick up a couple of friends and bring them back to Los Angeles. The flight up was routine, cruising at 7,500 feet, 15-knot headwind, but smooth and clear with unlimited visibility.

We put in 20 gallons at North Las Vegas, where the price was a bit lower than at my home field of Whiteman (WHP). During the takeoff roll something went wrong: a change in the exhaust note, a drop in the manifold pressure. I aborted and taxied off the side of the runway.

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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