Hartzell HC-E4 3 Series Owner's Manual page 184

(4) Visually examine the counterweight clamps for cracks,
corrosion, and paint condition.
(a) Refer to "Counterweight Clamp" in the Inspection
Procedures section of this chapter.
(b) A cracked counterweight clamp must be referred
to a certified propeller repair station with the
appropriate rating.
(5) Visually examine the B-3842-0500 anti-rotation pins
installed in the counterweight clamp of a PC-21 5-Blade
propeller for fractures or cracks. Refer to Figure 5-3.
(a) Propellers with pins containing cracks that
encompass less than 50% of the pin's circumference
may be returned to service.
Anti-Rotation Pin Installation
INSPECTION AND CHECK
Propeller Owner's Manual
147
Figure 5-3
61-00-47
B-3842-050
Anti-Rotation Pin
Page 5-14
Rev. 17 Sep/20