Hartzell HC-E4 3 Series Owner's Manual page 177

(4) Check the propeller speed control and operation from
low pitch (or reverse) to high pitch using the procedure
specified in the POH.
(a) Perform all ground functional, feathering, and cycling
checks with the minimum propeller RPM drop
required to demonstrate the function.
WARNING:
(5) Check for any abnormal vibration during this run-up.
(a) If vibration occurs, shut the engine down, determine
the cause, and correct it before further flight.
1 Refer to the section, "Vibration" in the Testing
and Troubleshooting chapter of this manual to
determine the cause/correction for the vibration.
(6) Shut down the engine in accordance with the POH.
(7) For additional inspection information (including possible
corrections), refer to the section, "Inspection Procedures"
in this chapter, and/or the Testing and Troubleshooting
chapter of this manual.
(8) Refer to the POH and the airframe manufacturer's
manual for additional operational checks.
INSPECTION AND CHECK
Propeller Owner's Manual
ABNORMAL VIBRATION CAN BE AN
INDICATION OF A FAILING PROPELLER
BLADE OR BLADE RETENTION
COMPONENT. AN IN-FLIGHT BLADE
SEPARATION CAN RESULT IN DEATH,
SERIOUS BODILY INJURY, AND/OR
SUBSTANTIAL PROPERTY DAMAGE.
147
61-00-47
Rev. 17 Sep/20
Page 5-7