Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
4
NORMAL
PROCEDURES
ALTITUDE
80%
POWER
70%
POWER
60%
POWER
KTAS NMPG KTAS NMPG
KTAS
NMPG
Sea
Level
113 12.3
108
13.4
100 14.5
4000
feet
117
12.8
111
13.9
103
14.9
8000
feet
122
13.3
115
14.3
105
15.3
Figure
4-3.
Cruise
Performance
Table
LEANING
USING
THE
EGT
INDICATOR
At
or
below
80%
power
in
level
cruise
flight,
the exhaust
gas
temperature
(EGT)
indicator is
used
to
lean the
fuel-air
mixture
for
best
performance
or
economy.
The
Cruise
Performance
charts
in
Section
5
are
based
on
the
EGT
to
adjust
the
mixture
to
Recommended Lean
per
Figure
4-4.
MIXTURE
DESCRIPTION
EXHAUST
GAS
TEMPERATURE
RECOMMENDED
LEAN
(Pilot’s
Operating
Handbook
)
50°
Rich
of
Peak
EGT
BEST
ECONOMY
Peak
EGT
Figure
4-4.
EGT
Table
Use the mixture
control vernier
adjustment
(rotate
the knob
CCW
to
lean the
mixture)
to
slowly
lean,
from
full
rich
or
maximum
RPM
mixture,
while
monitoring
the
EGT
indicator. As
the
EGT
indication
begins
to
increase,
continue
to
slowly
lean the mixture
until
an
EGT
indication
decrease is
just
detectable.
Reverse the
adjustment
slowly
in
the rich direction
until
an
EGT
indication
decrease
is
again just
detectable,
then
set
the
EGT
index
pointer
to
match
the
peak
indication. The
mixture
may
be leaned
slightly
to return to
peak
EGT
or
may
be
further
richened
to
Recommended
Lean
mixture
as
desired.
Continuous
operation
at
mixture
settings
lean
of
peak
EGT
is
prohibited.
Any change
in
altitude
or
throttle
position
will
require
that
peak
EGT
be
redetermined
and the
desired
mixture be
reset.
Under
some
conditions,
engine
roughness
may
occur
at
peak
EGT.
In
this
case,
operate
at
Recommended
Lean
mixture.
As noted
in
Figure
4-4,
operation
at
peak
EGT
provides
the
best
fuel
economy.
Operatoion
at
peak
EGT
results
in
approximately
4%
greater
range
and
approximately
a
3
knot
decrease
in
airspeed
from
the
figures
shown
in
the
Performance
section
of
this
handbook.
Recommended
Lean mixture
provides
best
level
cruise
performance
(generally
close
to
"best
power"
or
maximum
RPM).
Revision
7
4-27
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English