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installation matched with the new three-blade Hartzell lightweight composite propeller and a
built-in oxygen system. Cirrus says that along with incorporating GAMIjectors balanced fuel/air
ratios, this system will provide increased speed while maintaining remarkably cool cylinder head
temperatures with less cruise fuel consumption.
Cirrus adds the combination of advanced engine turbocharging and a highly efficient propeller
will maximize fuel-to-thrust rates while permitting enhanced performance at higher altitudes.
"The Cirrus Turbo represents a further commitment by Cirrus to implement only the very best
engineering concepts in their products for the personal aviation industry," said George Braly,
Chief of Engineering for Tornado Alley Turbo, Inc. "These systems are widely recognized as
superior to any other turbo engine installations in personal aviation."
Of course, with the addition of the turbo comes two upgrades that are near-and-dear to most
pilots... MORE power, and MORE speed. So, how much more of each are we talking about here?
Well, Cirrus is saving the official announcement of THOSE figures for Oshkosh... but while we're
expecting to see noteworthy bumps in both over normally-aspirated SR22s, Cirrus Vice Chairman
and Co-founder Dale Klapmeier said that wasn't the only reason for adding a turbo to the SR22.
"We made the choice to further expand the SR22's performance envelope in direct response to
our recognition of higher-than-normal owner flight hours. How do you make a Cirrus aircraft
more efficient and enable higher altitude flight? You add a turbo."
"When making the decision about adding the Turbo to our fleet, Cirrus chose the Supplemental
Type Certificate (STC) path as a matter of integrity," added Klapmeier. "With the real possibility
of losing 100 low lead aviation fuel, we felt that we owed it to our customers to be prepared for
that day."
One thing is for certain, though... with the Turbo Cirrus, flights will be easier, shorter and
faster...
Stay tuned.
Ai r f rame Technology
Cirrus has made significant in-roads in
the general aviation community. With
more and more aircraft being purchased,
more mechanics are working on
these aircraft. But there are differences
when working on this aircraft that we
need to be aware of. We will look at
some inspection and maintenance items
specific to these aircraft.
Composite
The majority of the structure on a Cirrus
aircraft is composite. If you ever get a
chance to tour the assembly plant in Duluth,
MN, you will see what looks like an assembly
line for a large model airplane.
Most of the airframe structure is an
eight-harness fiberglass composite. There
are a few areas that are carbon composite,
such as the doors. Most of the structure
is closed-cell foam core for strength
and stability.
Visual inspection
A major part of composite inspection is
visual inspection. Although you are only
looking at the outer (exposed) layer of the
composite lay up during a visual inspection,
it is an important part of the inspection
process. A good visual inspection
can help you identify areas that require
further, more in-depth inspection. Look for
any surface imperfections that could be
the result of impact damage such as scuffing,
chipping, surface cracking, or crazing.
Visual inspection will also help identify
near-surface delaminations (that appear as
bulges) and severe disbonding. If the laminate
is exposed, damage will appear white.
With non-sandwiched laminate structure, if
the surface is visible and you have access
to the back side, then you can use the
translucent nature of the fiberglass to help
you with the inspection. If you use a light
to illuminate the back side of the structure,
any internal defects such as delaminations
will be seen as a dark or grey area.
By Joe Escobar Composites
Some tips for working on Cirrus composite structures
16 July 2006 • Aircraft Maintenance Technology • www.AMTonline.com • www.AMTSociety.org
www.AMTSociety.org • www.AMTonline.com • Aircraft Maintenance Technology • July 2006 17
Ai r f rame Technology
Different tools can be useful in visual
inspections. Of course, a good flashlight is
essential. A good tip to help locate defects
such as slight bulges is to shine the flashlight
at a low angle across the structure
(versus shining it straight on). This angle
will make surface defects pop out more.
Coin tap test
A coin tap test is used to determine
laminate damage in the composite. Just as
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