Cessna 120 — Airworthiness Directives

This document is a service letter index from Hartzell Propeller, detailing various service letters related to propeller maintenance and installation. The index includes obsolete documents and revisions, providing a comprehensive overview of the service letters issued as of August 13, 2025. It is intended for maintenance personnel and operators of aircraft equipped with Hartzell propellers, including those on Cessna and Beechcraft models. The document does not specifically address the Cessna T310, but rather focuses on propeller models used in various aircraft, including the Cessna 180 and 182.

• The document is a service letter index for Hartzell Propellers, not specific to Cessna T310.
• It includes obsolete service letters and revisions as of August 13, 2025.
• Maintenance recommendations and installation instructions are provided for various propeller models.
• Service life limits for propeller components are outlined, crucial for safety.
• The index covers propellers used in Cessna 180 and 182 aircraft, among others.