CESSNA F-172 H manuals

This service letter, SEL-74-06, issued by Textron Aviation, addresses mandatory inspections related to specific magneto models installed in various Cessna and Beechcraft aircraft. The document outlines the potential risks associated with the movement of impulse coupling stop pins within Slick magnetos, which could lead to catastrophic engine failure. It provides compliance instructions for affected aircraft owners and maintenance personnel, emphasizing the importance of timely inspections and documentation. The service letter is applicable to a wide range of Cessna models, including the 120, 140, 150, and 172 series, among others. It is crucial for aircraft operators to adhere to the guidelines to ensure safety and compliance with aviation regulations.

• Mandatory inspection of affected magneto models every 100 hours or 400 hours TIS, and every 500 hours thereafter.
• Document compliance in the aircraft logbook after inspections or replacements.
• Ground the aircraft and disconnect electrical power before performing inspections.
• Follow specific procedures outlined in referenced service bulletins for magneto inspection.
• Potential for catastrophic engine failure if impulse coupling stop pin is not inspected.