AD/PA-31/90 - Rudder Trim Mechanism

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, serve to regulate aviation safety and operations across the nation. Within this regulatory framework, Part 39 specifically addresses airworthiness directives, which are mandatory orders issued by the Civil Aviation Safety Authority to ensure aircraft remain in a safe condition for operation. One such directive, AD/PA-31/90, pertains to the rudder trim mechanism on Piper PA-31 series aeroplanes. This directive was introduced to address the identified problem of potential non-compliance with specified requirements for rudder trim travel in certain model PA-31T and PA-31T1 aeroplanes. The directive mandates that the action outlined in Piper Service Bulletin No. 674 be undertaken to ensure compliance, with a specified timeline of within 100 hours of time in service after 31 March 1980. The overarching policy objective of this directive is to maintain the highest safety standards in civil aviation by ensuring the airworthiness of aircraft in accordance with the manufacturer's specifications.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines the Civil Aviation Safety Authority (CASA) schedule of airworthiness directives which governs the operational standards and safety requirements for aircraft in Australia. This particular airworthiness directive AD/PA-31/90 pertains to Piper PA-31 Series aeroplanes, focusing on the rudder trim mechanism. It applies to all model PA-31T aeroplanes with serial numbers ranging from 31T-7400002 to 31T-8020007, and all model PA-31T1 aeroplanes with serial numbers ranging from 31T-7804001 to 31T-8004008. The directive mandates compliance with Piper Service Bulletin No. 674, requiring corrective action to be taken within 100 hours of time in service after 31 March 1980. This requirement is designed to address potential issues with rudder trim travel that could affect the aircraft's safety and performance. The scope of this directive is limited to the specified models and serial numbers, ensuring that only the affected aeroplanes must comply with the outlined safety measures.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives for Piper PA-31 Series Aeroplanes. One such directive, AD/PA-31/90, pertains to the rudder trim mechanism for certain models of these aeroplanes (Section 3/80). This directive applies to all model PA-31T aeroplanes with serial numbers (S/Nos.) ranging from 31T-7400002 to 31T-8020007, and all model PA-31T1 aeroplanes with S/Nos. ranging from 31T-7804001 to 31T-8004008. The directive mandates that action must be taken in accordance with Piper Service Bulletin (SB) No. 674. Compliance with this directive is required within 100 hours of the aeroplanes' time in service after 31 March 1980. The obligations imposed by this directive include ensuring that the rudder trim mechanism of the specified Piper PA-31 Series aeroplanes is inspected and, if necessary, modified or replaced to meet the specifications outlined in Piper SB No. 674. This involves a detailed review and possible repair or adjustment of the rudder trim system to ensure it operates within the safety parameters set by the manufacturer. The directive's applicability and the timeframe for compliance are clearly defined, leaving no ambiguity regarding the necessary actions. Failure to comply with the requirements set out in AD/PA-31/90 could result in severe consequences. Civil aviation regulations often impose strict penalties for non-compliance with airworthiness directives. Although the specific penalties for this directive are not detailed in the text, it is understood that breaches of airworthiness regulations can result in substantial fines, and in severe cases, the grounding of the affected aircraft until compliance is achieved. The safety implications of non-compliance are critical, as they directly impact the airworthiness and safety of the aeroplane, potentially leading to serious accidents or incidents.