Cessna 177RG Cardinal — Service Bulletins

This Service Bulletin (TAT SB11-07) issued by Tornado Alley Turbo, Inc. addresses critical safety concerns regarding the Cessna 177RG aircraft equipped with a turbonormalizer system. It highlights the issue of cracked ceramic insulators in Champion RHB32S fine wire spark plugs, which have been linked to preignition events that can lead to engine failure. The bulletin mandates the replacement of these spark plugs with approved alternatives to prevent potential accidents. The document is aimed at aircraft owners and maintenance personnel, providing detailed instructions and compliance requirements to ensure safety and airworthiness.

• The bulletin applies to Cessna 177RG aircraft with specific turbonormalizer systems and spark plugs.
• Cracked spark plugs can cause preignition, leading to severe engine damage and forced landings.
• Pilots should monitor CHT and take immediate corrective action if rapid increases are observed.
• Spark plugs must be replaced with approved alternatives within 50 hours or at the next maintenance event.
• Logbook entries must document compliance with the service bulletin.