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Engine Operation
4-4.3. Engine Overspeed
Operating an engine beyond its capacity can damage the engine and result in subsequent
engine failure. Engine overspeed severity is divided into three categories in Table 4-1:
Category
NOTE: Rated RPM limits for aircraft equipped with digital RPM
measuring equipment may be adjusted to include a +2% deviation for
normal operations. Any operation beyond the rated RPM limit plus the
2% deviation must follow the inspection criteria.
4-4.3.1. Category I Overspeed
If the duration of the overspeed event is less than ten seconds, no action is required. If the
overspeed event persists longer than 10 seconds, land the plane and perform a Category I
Overspeed Inspection according to instructions in Section 6-5.3 of M-0, Standard Practice
Maintenance Manual.
4-4.3.2. Category II Overspeed
If the overspeed event duration is less than ten seconds, perform a Category I Overspeed
Inspection according to instructions in Section 6-5.3 of M-0, Standard Practice
Maintenance Manual. If the overspeed event lasts longer than 10 seconds, land as soon as
practical and perform a Category II Overspeed Inspection according to instructions in
Section 6-5.3 of M-0, Standard Practice Maintenance Manual.
4-4.3.3. Category III Overspeed Inspection
Overspeed conditions in this category are considered extreme; perform a Category III
Overspeed Inspection according to instructions in Section 6-5.3 of M-0, Standard Practice
Maintenance Manual.
4-4.4. High Cylinder Head Temperature
Supplement AFM/POH instructions with these steps:
1. Cowl Flaps ....................................................... OPEN
2. Mixture............................................................. Enrich to reduce CHT
3. Airspeed ........................................................... Increase
If temperature cannot be maintained within limits, reduce power, LAND AS SOON AS
PRACTICAL and have the malfunction evaluated prior to further flight.
4-16
Table 4-1. Overspeed Categories
Engine Speed
Rated Full power RPM to 3000 RPM
CAT I
3000-3300 RPM
CAT II
Over 3300 RPM
CAT III
O-200-D & X Series Engine Installation and Operation Manual
3 January 2017
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