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 for testing GAMI's G100UL unleaded avgas, was left in Oshkosh for mechanics to investigate unexplained stains found under its left wing.
The stains were on the wing with the G100UL fuel tank, but AOPA states the substance, source, and whether the fuel is the cause have not yet been determined.
GAMI's chief engineer suggests the stains are likely due to an old or faulty fuel cell bladder, a common issue in Barons, and asserts that G100UL has been tested compatible with bladder materials.

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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.