AD/PA-25/33 Amdt 2 - Wing Forward Spar - Inspection and Modification

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, address safety directives concerning various aircraft models, including Piper PA-25 (Pawnee) Series Aeroplanes. Enacted by the Parliament of Australia, these regulations aim to ensure the safety of civil aviation by mandating regular inspections and modifications to aircraft components. One such directive, AD/PA-25/33 Amendment 2, pertains to the wing forward spar of PA-25-235 and PA-25-260 models with serial numbers prior to 25-7405573. This directive seeks to mitigate risks associated with structural integrity by requiring inspections and specific modifications to the wing forward spar. The policy objective is to maintain airworthiness standards and enhance safety through systematic oversight and timely interventions.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, as amended, pertains to the applicability of airworthiness directives issued by the Civil Aviation Safety Authority. These regulations apply to all models of Piper PA-25 (Pawnee) Series Aeroplanes with serial numbers (S/Nos.) prior to 25-7405573, including PA-25-235 and PA-25-260 variants. The directive mandates specific inspection and modification procedures for the wing forward spars to ensure airworthiness. Compliance with these directives is mandatory for the aircraft's continued operation within Australian airspace. The geographic and jurisdictional reach of these regulations extends to all civil aviation activities conducted under the Commonwealth of Australia. The regulations do not specify any exclusions, exemptions, or thresholds but are enforced through subordinate instruments that may provide further detail on compliance and enforcement mechanisms. These regulations ensure that the specified aircraft models meet stringent safety standards, thereby protecting the integrity of civil aviation operations.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives, which include requirements and procedures for ensuring the safety of aircraft in operation. For the Piper PA-25 (Pawnee) series aeroplanes, AD/PA-25/33 Amendment 2 details specific requirements for the wing forward spar (section 5/76). This directive applies to all models PA-25-235 and PA-25-260 with serial numbers prior to 25-7405573. The directive mandates three key actions: inspecting the left and right wing forward spar in accordance with Piper Service Bulletin (SB) 410 (paragraph 1), modifying these spars by fitting Piper Kit No. 760840 as per Piper SB 414 (paragraph 2), and inspecting the inboard end of the modified spars for cracks or signs of distress, with particular attention to the area at the outboard ends of the reinforcing plate (paragraph 3). The obligations under this directive are clear and specific. Operators of the affected Piper PA-25 series aeroplanes must ensure that the left and right wing forward spar inspections are conducted at intervals not exceeding 300 hours of time in service until the spars are modified (paragraph 1). Following the modification, the inspections must be carried out at intervals not exceeding 1200 hours of time in service or every 2 years, whichever occurs first (paragraph 3). The modification itself must be completed no later than the next major inspection after 31 July 1974 (paragraph 2). These requirements are intended to ensure the structural integrity and continued airworthiness of the aircraft, thereby enhancing flight safety. Failure to comply with the provisions of AD/PA-25/33 Amendment 2 can result in serious consequences. CASA, as the regulatory authority, can take action against operators who do not adhere to these airworthiness directives. Non-compliance may lead to the grounding of the aircraft, preventing it from flying until the required inspections and modifications are completed. In severe cases, failure to comply with airworthiness directives can result in administrative penalties or even criminal charges against the aircraft operator or responsible maintenance personnel. The exact penalties are not specified in the directive itself but can include fines or imprisonment, depending on the severity of the breach and the discretion of the court. The potential for these penalties underscores the importance of adhering to the regulatory requirements set forth in the Civil Aviation Regulations 1998.