Cessna 170 — Service Bulletins

This document is an Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority of Australia concerning the Cessna 170 and related models. It addresses safety concerns regarding the cigar lighter wiring in these aircraft, which has been linked to incidents of unprotected electrical wiring shorting. The directive outlines the necessary actions to be taken to mitigate the risk of in-flight electrical failures, smoke, or fire. Compliance with the directive is required at the next annual inspection or within a specified time frame, ensuring that aircraft owners and operators are aware of the risks and the corrective measures needed to maintain safety standards.

• The directive applies to Cessna 170, 172, R172, P172, and 175 series aircraft.
• Cessna 170 serial numbers affected are 18000-20999 and 25000-27169.
• Disconnect the wire connecting the cigar lighter to the electrical bus as per the directive.
• Compliance is required at the next annual inspection or within 100 hours or 12 months, whichever comes first.
• The directive aims to prevent in-flight electrical failures and potential fires.