Cessna 120 — Service Bulletins

This document is an Airworthiness Directive (AD) schedule specifically for the Cessna 120 aircraft, issued by the CAA of New Zealand on April 28, 2022. It outlines mandatory compliance requirements for various components and systems of the Cessna 120 to ensure continued airworthiness and safety. The directives include inspections, modifications, and replacements of critical parts such as the forward doorposts, rudder control cable horns, elevator spar web, and more. Each directive specifies the applicable serial numbers, compliance timelines, and references to relevant FAA Airworthiness Directives. This document is essential for maintenance personnel and operators of the Cessna 120 to adhere to safety regulations and maintain the aircraft's operational integrity.

• Cessna 120 aircraft must comply with FAA ADs as specified in the document.
• Forward doorposts must be inspected for cracks and replaced if necessary within 100 hours TIS.
• Rudder control cable horns require inspection and possible reinforcement or replacement within 100 hours TIS.
• Elevator spar web inspections are critical, with specific actions required based on crack length.
• Propeller blades must be inspected for cracks, with replacements mandated if defects are found.