AD/AC/49 - Wing Main Spar - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, aim to ensure the safety and efficiency of civil aviation within Australia. Part 39 - 105 of these regulations includes specific airworthiness directives, one of which is AD/AC/49 concerning the inspection of the wing main spar for the Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) Series Aeroplanes. This directive was introduced to address the identified safety concerns related to the structural integrity of the wing main spar, ensuring that aircraft maintain their airworthiness standards. The policy objective is to mandate inspections and compliance within specified timeframes to prevent potential safety hazards, thereby protecting passengers and crew. The specific airworthiness directive AD/AC/49 applies to Model 690 aircraft with serial numbers ranging from 11001 to 11021, requiring a mandatory inspection within 100 hours’ time in service after 31 May 1973. This directive is part of the broader regulatory framework managed by the Civil Aviation Safety Authority (CASA), which oversees compliance to enhance the safety and reliability of civil aviation operations in Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to all aircraft registered in Australia and governed by the Civil Aviation Safety Authority (CASA). This regulation includes any Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) series aeroplanes, particularly those within the Model 690 series with serial numbers ranging from 11001 to 11021. It mandates that an inspection of the wing main spar be conducted within 100 hours of time in service after 31 May 1973, as detailed in Aero Commander Service Letter No. 253. The regulation extends its applicability to any person or entity operating such aircraft within Australian jurisdiction, ensuring that all safety directives are strictly adhered to. The regulation does not provide specific exclusions or exemptions but does indicate that compliance must be demonstrated to CASA through the appropriate documentation and inspection processes.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, details the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives for the Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) Series Aeroplanes. This section, AD/AC/49, mandates the inspection of the wing main spar for Model 690 aircraft with serial numbers (S/Nos.) ranging from 11001 to 11021. The directive requires compliance within 100 hours of time in service following 31 May 1973, as outlined in Aero Commander Service Letter No. 253. The primary obligation imposed by these regulations is the necessity for aircraft operators to conduct a thorough inspection of the specified wing main spars. This inspection must adhere to the guidelines and standards set forth in the referenced Aero Commander Service Letter No. 253. The aim is to ensure that any potential structural issues or defects are identified and rectified to maintain the airworthiness and safety of the aircraft. Non-compliance with this directive could result in the aircraft being grounded until the required inspection is satisfactorily completed. Failure to comply with the provisions of this airworthiness directive can result in significant consequences. Under the Civil Aviation Act 1988, operators who do not adhere to these requirements may face penalties. These penalties can include fines and potential criminal charges if the non-compliance is found to have endangered flight safety. The severity of the penalties can vary based on the degree of negligence and the potential risk posed by the non-compliance. In cases where an inspection reveals critical structural issues, the aircraft may be required to undergo immediate repairs or even be grounded until the necessary work is completed. Such actions are taken to ensure the safety of all passengers and crew, and to maintain the overall integrity of the aviation industry.