SECTION 4
NORMAL PROCEDURES
CESSNA
MODEL 172S
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
accu rately.
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-Iean the mixture .as described
above until ready
I
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
75% or less power.
I
I
I
I
NOTE
• 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 tetraethyllead
passing through the engine.
Revision 4
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