Hartzell HC-B3-2 Series Owner's Manual And Logbook page 206

(2) Inspection Procedure
(a) Remove the spinner dome.
CAUTION:
(b) Perform a visual inspection of the hub, blade
clamps, and blades to locate the source of the
grease leak.
1 If the source of the grease leak is a non-critical
part such as an O-ring, gasket, or sealant,
repairs can be accomplished during scheduled
maintenance as long as flight safety is not
compromised.
2 If cracks are suspected, additional inspections
to verify the condition must be performed before
further flight.
a
(c) If cracks or failing components are found, these
parts must be replaced before further flight.
1 Report such occurrences to the appropriate
airworthiness authorities and to Hartzell
Propeller Inc. Product Support.
INSPECTION AND CHECK
Propeller Owner's Manual
PERFORM A VISUAL INSPECTION
WITHOUT CLEANING THE PARTS. A
TIGHT CRACK IS OFTEN EVIDENT
DUE TO TRACES OF GREASE
EMANATING FROM THE CRACK.
CLEANING CAN REMOVE SUCH
EVIDENCE AND MAKE A CRACK
VIRTUALLY IMPOSSIBLE TO SEE.
Inspections typically include disassembly of
the propeller followed by inspection of parts,
using nondestructive methods in accordance
with published procedures.
(1) These inspections must be performed
by a certified propeller repair station with
the appropriate rating.
139
61-00-39
Rev. 17 Apr/20
Page 5-20