Stains Reported on Wing of AOPA Aircraft Fueled by GAMI G100UL

The Beech Baron is being used as a test bed to compare the performance of GAMI G100UL unleaded avgas with 100LL.

Russ Niles

Wednesday, July 31, 2024 at 02:32 PM ET

Verified

Edited By:

Travis Tingle

[Courtesy: AVweb]

Key Takeaways:

AOPA's dual-fuel Beech Baron, used to compare G100UL unleaded avgas with 100LL, was left in Oshkosh after unexplained stains appeared under its left wing (where G100UL is stored) during EAA AirVenture.
Mechanics are scheduled to investigate the source and nature of the stains, as it is currently unconfirmed if they are fuel-related or what the substance is.
GAMI's chief engineer speculates the stains are likely due to a faulty or old fuel bladder or patch, noting that G100UL has been tested for material compatibility and bladder leaks are common in Barons.

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The Aircraft Owners and Pilots Association (AOPA) says it left its dual-fuel Beech Baron behind in Oshkosh, Wisconsin, so mechanics can trace the source of some stains that were discovered under the left wing while it was on display at EAA AirVenture.

The Baron is being used as a test bed to compare the performance of General Aviation Modifications Inc.’s (GAMI’s) G100UL unleaded avgas with 100LL. The stains are on the wing with the tank holding G100UL, but it has not been determined that they came from the fuel.