4-12
O-200-D & X Series Engine Installation and Operation Manual
3 January 2017
Engine Operation
4-3.8. Descent
NOTE: Rated RPM limits for aircraft equipped with digital RPM
measuring equipment may be adjusted to include ±2% deviation for
normal operations. Any operation beyond the rated RPM limit plus 2%
deviation must follow the inspection criteria.
CAUTION: Monitor engine RPM during descent to ensure maximum
rated engine RPM is not exceeded. Avoid rapid descents at high
RPM and idle manifold pressure. If engine RPM approaches
maximum rated RPM, reduce the angle of descent to increase drag
and maintain engine operation within rated specifications. If the
engine exceeds rated engine RPM for more than one minute, refer to
“Engine Overspeed” in Section 6-5.3 of M-0, Standard Practice
Maintenance Manual.
Supplement the AFM/POH with the following:
1. Descend at cruise power settings with mixture control positioned for smooth engine
performance.
2. Monitor engine instrumentation to maintain operation within the “Engine
Specifications” in Section 2-4.
NOTE: Avoid long descents at low manifold pressure. The engine can
cool excessively and fail to accelerate satisfactorily when power is
reapplied. If outside are is extremely cold, it may be necessary to increase
drag in order to maintain engine power without gaining airspeed. Do not
permit cylinder temperature to drop below 300°F (149°C) for periods
longer than five minutes.
3. Engine gauges .................................................. within operating limits
4-3.9. Landing
NOTE: Advance mixture slowly toward “Full Rich.”
For landing and approach procedures, refer to the AFM/POH. In anticipation of a go
around and subsequent need for higher power, set the Mixture Control to FULL RICH.
Summary of Contents for O-200-D
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