Hartzell HC-E4 3 Series Owner's Manual page 134

(12) Safety all mounting nuts with 0.032 inch (0.81 mm)
minimum diameter stainless steel wire or equivalent
aircraft safety cable. (Two nuts per safety.)
(13) If the propeller is equipped with an accessory drive pulley,
follow the applicable manufacturer's instructions for
installation of the accessory drive pulley hardware.
(14)If the propeller is equipped with an ice protection
system that uses components supplied by Hartzell
Propeller Inc., applicable instructions and technical
information for the components supplied by Hartzell
Propeller Inc. can be found in Hartzell Propeller Inc. Ice
Protection System Manual 180 (30-61-80).
(15) Propeller ice protection system components not
supplied by Hartzell Propeller Inc. are controlled by the
applicable TC or STC holder's Instructions for Continued
Airworthiness (ICA).
INSTALLATION AND REMOVAL
Propeller Owner's Manual
147
61-00-47
Page 3-44
Rev. 17 Sep/20