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When leaning, accomplish the procedure as precisely as
possible.
A little extra effort in setting the mixtures will
yield significant dividends.
For normal cruise conditions, your power computer should
be utilized to set the fuel flows.
The power computer is
based on true OAT, which is obtained by subtracting the ram
rise from the indicated OAT.
A ram rise chart is provided in
the pilot's checklist.
The power computer is marked with two
fuel flow scales.
These scales are provided to ensure that
you can obtain the maximum performance and utilization from
your Cessna.
The inner fuel flow scale (marked Recommended
Lean) should be utilized for all normal cruise performance.
Data shown in Section VI are based on Recommended Lean mix-
ture.
The outer fuel flow scale (marked Best Power) will
provide maximum speed for a given power setting.
The speed
will be approximately one knot greater than the speed with
Recommended Lean mixture.
Operation at Best Power mixture
will increase the life of the exhaust system and engine
valves and rings.
For best propeller synchronizing, the final adjustment
of the propeller controls should be made in a DECREASE RPM
direction.
The internal cowl flaps should normally be locked and
left in the FULL OPEN position for all flight and ground
operations, particularly on hot days.
Unlike external cowl
flaps that are designed to reduce engine temperatures, the
internal cowl flaps are designed to increase engine tempera-
tures during low power climb, cruise, descent, and operations
in below standard ambient conditions.
The cowl flaps should
be adjusted to modulate the cylinder head temperatures near
the center of the normal operating (green arc) range to
assure prolonged engine life.
Cowl flap position has no
effect on cruise or climb performance.
For flight in an icing environment, refer to the alter-
nate induction air system in the following paragraph.
2-10
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