Mooney M20E Chaparral — Supplemental Type Certificate

This document is a service bulletin concerning the Hartzell propellers used on the Mooney M20E Chaparral. It outlines various airworthiness directives and modifications necessary for maintaining the safety and performance of the propellers. The bulletin includes specific instructions for inspections, replacements, and modifications that must be performed to ensure compliance with FAA regulations. It is intended for maintenance personnel and pilots operating aircraft equipped with Hartzell propellers, particularly those on the Mooney M20E Chaparral.

• Hartzell propeller model HC-12 x 20 is used on Mooney M20E Chaparral.
• Inspect control pins for secure fastening to prevent propeller failure.
• Replace split rings with new type marked 'N' at next overhaul.
• Check torque on 3/8" bolts to 30 ft-lb at each 25-hour inspection.
• Inspect propeller blades for cracks using dye penetrant methods.