
4-16
IO-240 Series Engine Installation & Operation Manual
31 October 2011
Engine Operation
4-3.9. Descent
WARNING
Avoid rapid descents at high RPM and idle manifold pressure.
Supplement the AFM/POH with the following:
1. RPM .................................................................. Reduce from cruise
2. Mixture.............................................................. Adjust for smooth engine operation
WARNING
Avoid long descents at high RPMs or low manifold pressure to
prevent the engine from excessive cooling. If power must be
reduced for long periods, set the manifold pressure no lower
than necessary to obtain desired performance. If the outside air
is extremely cold, it may be desirable to add drag to maintain
engine power without gaining excess airspeed. Do not permit
the cylinder temperature to drop below 300° F (149° C).
CAUTION: Monitor engine RPM during descent to ensure maximum
rated engine RPM is not exceeded. 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 Inspections” in Section 6-4.3 of the
Maintenance and Overhaul Manual (M-6).
3. Cylinder Head Temperature .............................. 300°-460° F (149°-238° C)
4. Oil Temperature ................................................ 75°-240° F (24°-116° C)
5. Engine Gauges .................................................. within operating limits
6. Manifold pressure ............................................. above 18.5 in.Hg
7. Engine gauges ................................................... within operating limits
4-3.10. Landing
Supplement the AFM/POH landing procedure with the following:
NOTE: If engine roughness occurs with the mixture at full rich, as may
occur at very low throttle settings and high RPM, moderate leaning of the
mixture is required to maintain smooth engine operation.
1. Mixture Control ................................................ FULL RICH
2. Boost Pump....................................................... According to AFM/POH
Содержание IO-240-A
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