AD/PA-25/15 - Main Landing Gear Shock Strut - Inspection and Modification

Overview

The Civil Aviation Regulations 1998 (Cth), specifically Part 39 - 105, establish a schedule of airworthiness directives aimed at ensuring the safety and reliability of aircraft operating within Australian airspace. One such directive, AD/PA-25/15, pertains to the Piper PA-25 (Pawnee) series aeroplanes, addressing issues related to the main landing gear shock strut through required inspections and modifications. This directive was introduced to mitigate risks associated with potential structural weaknesses in the specified model's landing gear, ensuring continued compliance with safety standards. Enacted by the Commonwealth of Australia, the policy objective of these regulations is to maintain and enhance aviation safety through stringent oversight and mandatory compliance with airworthiness directives, thereby protecting both the aviation community and the public.

Scope and Application

The Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, as part of the Civil Aviation Regulations 1998, specifies mandatory compliance for certain aircraft types, including the Piper PA-25 (Pawnee) Series Aeroplanes. Specifically, AD/PA-25/15 pertains to the main landing gear shock strut and mandates inspection and potential modification of model PA-25-235 and its variants, serial numbers ranging from 25-2000 to 25-2591. This directive applies to aircraft operators who must ensure compliance by inspecting the main landing gear shock strut at each daily inspection until modifications are made according to Piper Service Bulletin 217 or FAA AD 63-17-5. The regulations are enforceable across the Commonwealth of Australia, overseen by CASA, ensuring safety standards are consistently applied throughout the nation. The directive does not specify any exclusions, exemptions, or thresholds, and compliance is expected without deviation. Subordinate instruments may provide further details or clarifications, but the primary responsibility for adherence lies with the aircraft operators within the specified serial number range.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, detail the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives for various aircraft types, including the Piper PA-25 (Pawnee) Series Aeroplanes. Under this part, the main operative section (AD/PA-25/15) focuses on the main landing gear shock strut of the PA-25-235 model and its variants with serial numbers ranging from 25-2000 to 25-2591. This directive mandates that these aircraft must comply with either Piper Service Bulletin No. 217 or the Federal Aviation Administration (FAA) AD 63-17-5. The primary requirement is to conduct an inspection of the main landing gear shock strut at each daily inspection until the modifications specified in Piper SB 217 are implemented. The Act imposes specific obligations on the owners and operators of the affected aircraft. They must ensure that the daily inspections are performed rigorously, following the outlined procedures in either Piper SB 217 or FAA AD 63-17-5. This entails a detailed examination of the main landing gear shock strut to identify any signs of wear, damage, or other issues that could compromise the aircraft's safety. Operators must also ensure that the modifications as per Piper SB 217 are carried out without delay to bring the aircraft into compliance. Failure to comply with these airworthiness directives can lead to serious consequences. The Civil Aviation Regulations include provisions for both civil and criminal penalties for non-compliance. Civil penalties may include fines, while criminal penalties can result in imprisonment, reflecting the severity of disregarding safety directives. The exact penalties are not specified in the text but generally align with the seriousness of the breach and the potential risk posed to aviation safety. Operators must, therefore, adhere strictly to the directives to avoid these severe repercussions.