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CRUISE
I.
Set Manifold pressure and RPM for cruise power selected.
2.
When engine temperatures have stabilized at cruise condition
(usually within 5 minutes after leveling of
I),
adjust mixture to
obtain specified fuel flow. See Engine Performance and Cruise
Control section of this manual or aircraft manufacturer's instruc-
tions.
3.
When a leaned mixture setting is used. and climb power is
desired, the mixture control rhust be returned to "FULL RICH"
before changing the throttle or propeller setting. When reducing
power, retard throttle, adjust R PM and then adjust mixture as
necessary.
NOTE ... If an exhaust gas temperature gauge is used to monitor
cruise fuel flow at 75% power and below. a cruise fuel mixture
adjusted to 100°F to 150° F rich of peak will produce the best power
setting. unless a specified setting is required for your particular
model engine.
DESCENT
Descent from high altitude should be accomplished at cruise power
settings, with the mixture control positioned accordingly.
CAUTION . .. Rapid descents al high RPM and idle man(fold
pressure are to be avoided.
During descent, monitor cylinder head and oil temperatures. main-
taining above the minimum specified limits.
NOTE ... Avoid long descents at low manifold pressure. which can
result in excessive engine cooling. Satisfactory engine acceleration
may not occur when power is applied. If power must be reduced for
long periods, adjust propeller to minimum governing RPM and set
manifold pressure no lower than necessary to obtain desired per-
formance. If the outside air is extremely cold, it may be desirable to
add drag (gear, flaps) to the aircraft in order to maintain engine
power without gaining excess airspeed. Do not permit cylinder
temperature to drop below 300°
F.
for periods exceeding five (5)
minutes.
3-10
u
l
.I
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