AOPA Pilot Magazine - June 2022 - 85

LEIGH CAULFIELD
RUDDER & WRENCH
UNLEADED FUELS /
Devil in the details
Why is it so difficult to come up with an
unleaded avgas?
BY PAUL MILLNER
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OH NO! I can hear you thinking. Not another
article about unleaded avgas. Haven't we
been hearing about this " coming soon " since
the Reagan administration? Well, yes. Lead
was phased out of mogas (automotive gasoline)
in the 1980s and early '90s because
of environmental toxicity and its adverse
impact on catalytic converters. At the time,
the industry wasn't sure how to meet all the
requirements for a safe aviation fuel and
achieve the 100-aviation octane required
for avgas without lead. (That would equate
to a 105-pump octane at your corner service
station.) So, the industry launched
the Coordinating Research Council (CRC)
Unleaded Avgas Development Group in
1991. That group of oil companies, aviation
companies, the FAA, and alphabet groups
like AOPA worked hard for 20 years looking
for a solution that, other than lead content,
would meet the existing avgas specification.
Unfortunately, no easy answer was identified.
The FAA then launched the Unleaded
Avgas Transition Aviation Rulemaking
Committee (UAT ARC), which in turn,
produced PAFI (Piston Aviation Fuels
Initiative) phases one and two, and now
has announced EAGLE (Eliminate Aviation
Gasoline Lead Emissions). Let's look at the
pillars of EAGLE to better understand the
challenge of unleaded avgas.
* " Support Research & Development
and Technology Innovations: The FAA
and industry stakeholders will support
research and testing of piston engine modifications
and/or engine retrofits that may
be necessary for unleaded fuel operations. "
We hope this is not required. The five
companies that have fielded candidate
fuels so far see no need for engine modifications
or retrofits. (Phillips 66 has
suggested an improved spark plug to resist
fouling by its proposed MMT additive, but
this would be an optional enhancement to
minimize maintenance expense.)
* " Develop Unleaded Fuels
Infrastructure and Assess Commercial
Viability: Industry stakeholders will
coordinate the production of commercially
viable unleaded fuels and create the
AOPA PILOT / June 2022
85
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AOPA Pilot Magazine - June 2022

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

Contents
AOPA Pilot Magazine - June 2022 - Intro
AOPA Pilot Magazine - June 2022 - Cover1
AOPA Pilot Magazine - June 2022 - Cover2
AOPA Pilot Magazine - June 2022 - 1
AOPA Pilot Magazine - June 2022 - Contents
AOPA Pilot Magazine - June 2022 - 3
AOPA Pilot Magazine - June 2022 - 4
AOPA Pilot Magazine - June 2022 - 5
AOPA Pilot Magazine - June 2022 - 6
AOPA Pilot Magazine - June 2022 - 7
AOPA Pilot Magazine - June 2022 - 8
AOPA Pilot Magazine - June 2022 - 9
AOPA Pilot Magazine - June 2022 - 10
AOPA Pilot Magazine - June 2022 - 11
AOPA Pilot Magazine - June 2022 - 12
AOPA Pilot Magazine - June 2022 - 13
AOPA Pilot Magazine - June 2022 - 14
AOPA Pilot Magazine - June 2022 - 15
AOPA Pilot Magazine - June 2022 - 16
AOPA Pilot Magazine - June 2022 - 17
AOPA Pilot Magazine - June 2022 - 18
AOPA Pilot Magazine - June 2022 - 19
AOPA Pilot Magazine - June 2022 - 20
AOPA Pilot Magazine - June 2022 - 21
AOPA Pilot Magazine - June 2022 - 22
AOPA Pilot Magazine - June 2022 - 23
AOPA Pilot Magazine - June 2022 - 24
AOPA Pilot Magazine - June 2022 - 25
AOPA Pilot Magazine - June 2022 - 26
AOPA Pilot Magazine - June 2022 - 27
AOPA Pilot Magazine - June 2022 - 28
AOPA Pilot Magazine - June 2022 - 29
AOPA Pilot Magazine - June 2022 - 30
AOPA Pilot Magazine - June 2022 - 31
AOPA Pilot Magazine - June 2022 - 32
AOPA Pilot Magazine - June 2022 - 33
AOPA Pilot Magazine - June 2022 - 34
AOPA Pilot Magazine - June 2022 - 35
AOPA Pilot Magazine - June 2022 - 36
AOPA Pilot Magazine - June 2022 - 37
AOPA Pilot Magazine - June 2022 - 38
AOPA Pilot Magazine - June 2022 - 39
AOPA Pilot Magazine - June 2022 - 40
AOPA Pilot Magazine - June 2022 - 41
AOPA Pilot Magazine - June 2022 - 42
AOPA Pilot Magazine - June 2022 - 43
AOPA Pilot Magazine - June 2022 - 44
AOPA Pilot Magazine - June 2022 - 45
AOPA Pilot Magazine - June 2022 - 46
AOPA Pilot Magazine - June 2022 - 47
AOPA Pilot Magazine - June 2022 - 48
AOPA Pilot Magazine - June 2022 - R-1
AOPA Pilot Magazine - June 2022 - R-2
AOPA Pilot Magazine - June 2022 - R-3
AOPA Pilot Magazine - June 2022 - R-4
AOPA Pilot Magazine - June 2022 - 49
AOPA Pilot Magazine - June 2022 - 50
AOPA Pilot Magazine - June 2022 - 51
AOPA Pilot Magazine - June 2022 - 52
AOPA Pilot Magazine - June 2022 - 53
AOPA Pilot Magazine - June 2022 - 54
AOPA Pilot Magazine - June 2022 - 55
AOPA Pilot Magazine - June 2022 - 56
AOPA Pilot Magazine - June 2022 - 57
AOPA Pilot Magazine - June 2022 - 58
AOPA Pilot Magazine - June 2022 - 59
AOPA Pilot Magazine - June 2022 - 60
AOPA Pilot Magazine - June 2022 - 61
AOPA Pilot Magazine - June 2022 - 62
AOPA Pilot Magazine - June 2022 - 63
AOPA Pilot Magazine - June 2022 - 64
AOPA Pilot Magazine - June 2022 - 65
AOPA Pilot Magazine - June 2022 - 66
AOPA Pilot Magazine - June 2022 - 67
AOPA Pilot Magazine - June 2022 - 68
AOPA Pilot Magazine - June 2022 - 69
AOPA Pilot Magazine - June 2022 - 70
AOPA Pilot Magazine - June 2022 - 71
AOPA Pilot Magazine - June 2022 - 72
AOPA Pilot Magazine - June 2022 - 73
AOPA Pilot Magazine - June 2022 - 74
AOPA Pilot Magazine - June 2022 - 75
AOPA Pilot Magazine - June 2022 - 76
AOPA Pilot Magazine - June 2022 - 77
AOPA Pilot Magazine - June 2022 - 78
AOPA Pilot Magazine - June 2022 - 79
AOPA Pilot Magazine - June 2022 - 80
AOPA Pilot Magazine - June 2022 - 81
AOPA Pilot Magazine - June 2022 - 82
AOPA Pilot Magazine - June 2022 - 83
AOPA Pilot Magazine - June 2022 - 84
AOPA Pilot Magazine - June 2022 - 85
AOPA Pilot Magazine - June 2022 - 86
AOPA Pilot Magazine - June 2022 - 87
AOPA Pilot Magazine - June 2022 - 88
AOPA Pilot Magazine - June 2022 - 89
AOPA Pilot Magazine - June 2022 - 90
AOPA Pilot Magazine - June 2022 - 91
AOPA Pilot Magazine - June 2022 - 92
AOPA Pilot Magazine - June 2022 - 93
AOPA Pilot Magazine - June 2022 - 94
AOPA Pilot Magazine - June 2022 - 95
AOPA Pilot Magazine - June 2022 - 96
AOPA Pilot Magazine - June 2022 - 97
AOPA Pilot Magazine - June 2022 - 98
AOPA Pilot Magazine - June 2022 - 99
AOPA Pilot Magazine - June 2022 - 100
AOPA Pilot Magazine - June 2022 - 101
AOPA Pilot Magazine - June 2022 - 102
AOPA Pilot Magazine - June 2022 - 103
AOPA Pilot Magazine - June 2022 - 104
AOPA Pilot Magazine - June 2022 - 105
AOPA Pilot Magazine - June 2022 - 106
AOPA Pilot Magazine - June 2022 - 107
AOPA Pilot Magazine - June 2022 - 108
AOPA Pilot Magazine - June 2022 - 109
AOPA Pilot Magazine - June 2022 - 110
AOPA Pilot Magazine - June 2022 - 111
AOPA Pilot Magazine - June 2022 - 112
AOPA Pilot Magazine - June 2022 - Cover3
AOPA Pilot Magazine - June 2022 - Cover4
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