Cirrus Service Advisory Throws Fuel on G100UL Maintenance Debate

The SA creates a potential dilemma for aircraft maintainers.

Richard Scarbrough

Tuesday, July 16, 2024 at 11:51 AM ET

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Edited By:

Ryan Ewing

GAMI is disputing Cirrus’s claim that use of G100UL voids the warranties on engines supplied by Lycoming and Continental and used in its aircraft. [Credit: Shutterstock]

Key Takeaways:

Cirrus released a service advisory advising against the use of FAA-approved G100UL fuel in its SR Series aircraft, citing concerns about materials compatibility and potential warranty invalidation.
This creates a dilemma for aircraft maintainers, who face a conflict between the FAA's approval of G100UL and Cirrus's lack of approval, potentially impacting their ability to return aircraft to service in accordance with all manufacturer guidelines.
While the FAA approves G100UL as safe via an STC, Cirrus and engine manufacturers suggest its use could void warranties, a claim disputed by GAMI, the fuel's developer, who points to extensive testing and safe long-term use.

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In June, Cirrus released a service advisory (SA) regarding the use of fuel that had not been approved for SR Series aircraft. This creates a dilemma for many, including aircraft maintainers.

The issue of what is legal (in FAA terms) and approved (by manufacturers) puts maintainers in a sticky situation. On one hand, the FAA issues a supplemental type certificate (STC) allowing for products to deploy on aircraft, but the engine and/or aircraft manufacturer may not approve or recognize the STC as something permitted for use under the terms of their warranty.