Textron Cessna 172R, Pilot Operating Handbook, Page: 140 / 500

SECTION 4
NORMAL PROCEDURES
CESSNA
MODEL 172R
NOTE
The EGT indicator requires several seconds to
respond
to
mixture adjustments and changes in
exhaust gas temperature. More rapid changes in
EGT indication are neither necessary
nor desirable.
Determining peak EGT and setting the desired
mixture should take approximately
one minute when
the adjustments
are
made
sufficiently
slowly and
accurately.
FUEL SAVINGS PROCEDURES FOR FLIGHT TRAINING
OPERATIONS
For best fuel economy during flight training operations, the
following procedures are recommended.
1
.
After engine start and for
all
ground
operations,
set the
throttle
to
1200 RPM
and lean the mixture for maximum RPM. Leave
the mixture at this setting
until beginning the
BEFORE
TAKEOFF
checklist.
After
the BEFORE TAKEOFF checklist is
complete
re-lean the mixture as described above until ready
| for the TAKEOFF checklist.
2.
Lean the mixture for maximum RPM during full
throttle climbs
|
above 3000 feet. The
mixture may remain leaned (maximum
RPM
at full throttle)
for practicing maneuvers such as stalls
and slow flight.
3. Lean the mixture for
maximum RPM during all operations
at
any altitude, including
those below
3000
feet, when using
80%
or
less power.
NOTE
I
•
When
cruising or maneuvering
at 80%
or
less
power, the mixture may be further leaned
until the
EGT
indicator
needle peaks
and is then
enrichened 50°F. This is
especially applicable
to
cross-country
training flights,
but
should be
practiced during transition flight
to
and from the
practice area as well.
|
•
Using the above
recommended procedures
can
provide fuel savings in
excess
of 5%
when
compared to
typical training operations
at
full rich
mixture.
In addition, the above procedures will
minimize spark plug fouling since the reduction in
fuel
consumption results in a proportional reduction
in tetraethyl
lead passing through the engine.
1
4-28
Revision
7
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