Britten-Norman is introducing the Unleaded Fuel Modification for its BN2B-26 piston engine (Lycoming O-540-E4C5) Islander aircraft. The three Lycoming-approved unleaded fuel specifications being included in this modification are ASTM D7547 (UL 91 & UL 94), DEF-STAN 91-090 (UL 91), and HJELMCO (91/96 UL).

In addition to reducing their environmental impact, operators of Islander aircraft who switch to unleaded fuels can potentially enjoy several benefits. These include cost savings on refueling, reduced maintenance expenses, access to a wider range of fuel options, extended servicing intervals, and enhanced safety through the use of unleaded fuels.

The decision by the US Federal Aviation Administration (FAA) to phase out leaded AVGAS has further underlined the importance of transitioning to unleaded fuels.

The certification of these new fuel types for the Britten-Norman Islander through the introduction of the Unleaded Fuel Modification opens the door to further possibilities for novel and environmentally friendly fuel types in the future.

Britten-Norman is a world-leading sub-regional aircraft manufacturer specializing in twin-engine piston and turboprop STOL aircraft. The company is a UK-based SME, exporting 97% of circa 1,300 aircraft manufactured to date.

The unleaded fuels in question are approved for use in the engine by Lycoming, as the engine Type Certificate holder in the Lycoming Service Instructions No.1070AB, for use in the O-540-E4C5 Piston Engine.