AD/P68/46 - Engine Cowl

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), were enacted to ensure the safety and efficiency of civil aviation within Australia. This legislation provides the framework for regulating all aspects of civil aviation operations, including airworthiness directives aimed at maintaining aircraft safety. One such directive, AD/P68/46, issued in 2000, addresses a specific issue identified with the Partenavia P68 series aeroplanes concerning engine cowl fasteners. The directive requires the removal and reinstallation of engine cowl side panels to ensure the fasteners are correctly aligned with the lower spar cap rivets, preventing potential structural compromise and ensuring compliance within 50 hours of the directive's issuance. The underlying policy objective is to mitigate risks associated with improper maintenance practices that could adversely affect aircraft safety. This Airworthiness Directive was introduced in response to a discovered instance where an engine cowl fastener on a P68 aircraft was improperly installed, penetrating the main spar instead of attaching to the wing spar's horizontal flange. This misalignment compromised the spar's fatigue properties and impacted the second most forward fastener, posing a significant safety risk. By mandating inspections and corrective actions, the directive aims to prevent such incidents, ensuring that all P68 aircraft maintain compliance with safety standards and are fit for continued operation.

Scope and Application

This legislative instrument pertains to the Civil Aviation Regulations 1998, specifically under Part 39 – 105, which concerns Airworthiness Directives. The particular Airworthiness Directive addressed here, AD/P68/46, applies to all Partenavia P68 series aeroplanes. The directive mandates the removal of the inboard and outboard engine cowl side panels to inspect and correct the alignment of the forward fasteners on both engines. The requirement is to ensure that these fasteners are correctly aligned with the solid rivets of the lower spar cap, a crucial step to prevent compromising the structural integrity of the aircraft. If the fasteners are not aligned, a detailed inspection and assessment by a CAR 35 authorised person are necessary before further flight, and a defect report must be submitted to the Civil Aviation Safety Authority (CASA). This directive must be complied with within the next 50 flight hours and became effective on 24 December 1999. The regulation is applicable nationally across Australia, governed by the Commonwealth, and applies to all entities and persons involved in the operation of P68 series aircraft, ensuring adherence to strict safety standards.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, detail the requirements for maintaining the airworthiness of Partenavia P68 Series aeroplanes, with a particular focus on engine cowl fasteners in AD/P68/46 (1). The directive applies to all P68 aircraft and mandates the removal of inboard and outboard engine cowl side panels from both engines. It is crucial to ensure that the forward fastener of the ‘pop’ fasteners attaching each engine cowl rear side fairings to the wing’s under surface aligns with the solid rivets of the lower spar cap. If all four fasteners are correctly aligned, no further action is required. However, if any fasteners are not aligned, their orientation and location must be determined before any further flights. In such cases, a defect report must be made to the Civil Aviation Safety Authority (CASA), and an assessment by a person authorised under CAR 35 is necessary before continuing with any flights (2). Compliance with these directives must be achieved within the next 50 flight hours, with the directive becoming effective from 24 December 1999. The obligations imposed on the parties governed by this legislation include the immediate inspection and alignment of specified fasteners on P68 aircraft engine cowlings. Operators must ensure that the specified fasteners are correctly aligned with the lower spar cap rivets, as per the directive. Should any misalignment be detected, operators are required to report the defect to CASA and obtain an assessment from an authorised person under CAR 35 before proceeding with further flights. This obligation underscores the importance of rigorous maintenance protocols to ensure the safety and airworthiness of the aircraft. Operators must also ensure that all actions are taken within the stipulated timeframe to comply with the directive’s requirements. Failure to comply with the provisions outlined in AD/P68/46 could result in serious consequences. The Civil Aviation Regulations 1998 impose penalties for non-compliance with airworthiness directives. If an operator fails to address the specified engine cowl fasteners correctly or does not report a defect to CASA, they may face legal repercussions. The exact penalties are not specified in the provided text, but non-compliance with airworthiness directives can lead to enforcement actions, including fines and potential grounding of the aircraft. These measures are in place to ensure that all aircraft meet the necessary safety standards and that any identified issues are promptly addressed to prevent any compromise to flight safety.