AOPA Pilot Magazine - July 2022 - 84

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Available on
iPhone and iPad.
you may see a variety of aviation gasolines
on offer as you fly from place to place.
Fueling safety requires that you know
what fuel your aircraft can safely use,
which fuels it can't use, and where to
find them in the face of potential bans on
certain grades of avgas. Is it as simple as
looking at the aircraft/engine paperwork?
Unfortunately, no. Our aircraft paperwork
references aviation gasoline grades long
ago abandoned or made unavailable. At
the same time, new gasoline options are
appearing at the airport. What does a pilot
need to know to avoid making an expensive
or dangerous mistake?
Most of our GA aircraft have engines
originally certified to operate on 80/87,
91/96, or 100/130 octane avgas. The first
number in each case is the aviation lean
octane rating. The second number in
each avgas octane pair is the aviation rich
rating, tested under conditions typically
found in highly boosted engines at very
rich mixtures.
91/96 avgas went away 60 years
ago as the airlines transitioned from
gasoline-burning piston aircraft to
kerosene-burning turbojets. 80/87 avgas
went away 20 years ago as 100LL was
adopted as a compromise: enough octane
for engines requiring 100 but less lead
than 100/130, to minimize lead fouling
of lower-compression 80/87 engines
designed for much lower lead additization
levels. But aircraft continued to be built
and sold with 80/87 and 91/96 avgas
listed as the required fuel, because of
certification inertia.
In 2016, the FAA sought to clarify
© 2022 All Rights Reserved
Connecting Aviators, LLC
the requirements by issuing a Special
Airworthiness Information Bulletin
(SAIB) HQ-16-05, now in revision 1,
" Fuel- Grade UL94 Unleaded Aviation
Gasoline. " The bulletin seems to say that
any aircraft or engine certified for either
80/87 avgas or 91/96 avgas is perfectly
safe and legal to use grade UL94 avgas.
The FAA similarly argues that since the
UL91 fuel (found mostly in Europe, made
by Total and Hjelmco) meets almost all
the same requirements as 100LL, except
for octane and lead content, then that
fuel too is acceptable for use in certified
aircraft with octane requirements of 91
or less.
84
AOPA PILOT / July 2022

AOPA Pilot Magazine - July 2022

Table of Contents for the Digital Edition of AOPA Pilot Magazine - July 2022

Contents
AOPA Pilot Magazine - July 2022 - Intro
AOPA Pilot Magazine - July 2022 - Cover1
AOPA Pilot Magazine - July 2022 - Cover2
AOPA Pilot Magazine - July 2022 - Contents
AOPA Pilot Magazine - July 2022 - 2
AOPA Pilot Magazine - July 2022 - 3
AOPA Pilot Magazine - July 2022 - 4
AOPA Pilot Magazine - July 2022 - 5
AOPA Pilot Magazine - July 2022 - 6
AOPA Pilot Magazine - July 2022 - 7
AOPA Pilot Magazine - July 2022 - 8
AOPA Pilot Magazine - July 2022 - 9
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AOPA Pilot Magazine - July 2022 - 11
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AOPA Pilot Magazine - July 2022 - 14
AOPA Pilot Magazine - July 2022 - 15
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AOPA Pilot Magazine - July 2022 - 18
AOPA Pilot Magazine - July 2022 - 19
AOPA Pilot Magazine - July 2022 - 20
AOPA Pilot Magazine - July 2022 - 21
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AOPA Pilot Magazine - July 2022 - 27
AOPA Pilot Magazine - July 2022 - 28
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AOPA Pilot Magazine - July 2022 - 30
AOPA Pilot Magazine - July 2022 - 31
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AOPA Pilot Magazine - July 2022 - Cover3
AOPA Pilot Magazine - July 2022 - Cover4
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