In July, fuel producers submitted their
replacement fuel proposals to the FAA for
further evaluation as part of the Piston
Aviation Fuels Initiative (PAFI), an
industry-government initiative designed to help
the general aviation industry transition to an
unleaded aviation gasoline.
The FAA assessed candidate fuels in terms of
their impact on the existing fleet, the
production and distribution infrastructure, the
impact on the environment, toxicology, and the
cost of aircraft operations.
Based on the results of the phase-one laboratory
and rig testing, the FAA anticipates that two or
three fuels will be selected for phase-two
engine and aircraft testing. That testing will
generate standardized qualification and
certification data for candidate fuels, along
with property and performance data. That entire
testing process is expected to conclude in 2018.