Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 161

WARNING:
C. Check for any abnormal vibration during this run-up. If
vibration occurs, shut the engine down, determine the cause,
and correct it before further flight. Refer to the Vibration
section in the Testing and Troubleshooting chapter of this
manual.
D. Refer to Periodic Inspections in this chapter for additional
inspection information and possible corrections to any
discrepancies discovered as a result of Pre-Flight Checks.
E. Refer to 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 A
CATASTROPHIC AIRCRAFT ACCIDENT.
140
61-00-40
Page 5-5
Rev. 2 Jun/12