Piper PA-31T Cheyenne II — Airworthiness Directives

This document is a schedule of airworthiness directives issued by the Civil Aviation Safety Authority of Australia, specifically addressing safety concerns for the Piper PA-31 series aeroplanes. It focuses on the electroluminescent panel inverters used in the PA-31T1 Cheyenne I and Cheyenne II models. The directive outlines the applicability of the airworthiness directive to specific serial numbers and mandates compliance actions based on a Piper service bulletin. The document is crucial for ensuring the safety and airworthiness of the affected aircraft models, particularly in preventing incidents related to electrical failures in the cockpit.

• The directive applies to Piper PA-31T1 Cheyenne I and Cheyenne II models.
• Affected serial numbers for Cheyenne I are 31T-7804001 to 31-7904016.
• Affected serial numbers for Cheyenne II are 31T-7400002 to 31T-7920036.
• Compliance must be achieved within 100 hours of time in service after December 31, 1979.
• Action must be taken in accordance with Piper SB No. 640.