CESSNA 185 — Service Bulletins

This Service Bulletin No. SB24-01, issued in January 2025, addresses the inspection and replacement of ACS Products Company keyed ignition switches for various aircraft models, including the Reims-Cessna F172. The bulletin outlines the reasons for the inspection, compliance requirements, and detailed instructions for pilots and mechanics. It emphasizes the importance of ensuring the integrity of ignition switches to prevent unintended engine startups, which could pose serious safety risks. The document provides specific compliance timelines and recommendations for regular testing of the ignition switches to maintain safety standards.

• Immediate inspection of ACS keyed ignition switches is required at the next pre-flight run-up after receipt of this bulletin.
• All ACS keyed ignition switches should be tested every 100 hours or at annual inspections, whichever comes first.
• The service life of ACS keyed ignition switches is 1000 hours or 10 years; they must be replaced after this period.
• If a key can be removed from the ignition switch in any position other than 'OFF', the switch must be replaced immediately.
• Logbook entries must be made to document compliance with the inspection requirements.