COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes
AD/AC/90 Wing Station 39 Wing Ribs 5/95
Applicability: Models 690, 690A, and 690B S/n 11001 to 11566 and Model 685 S/n 12001 to
12066.
Requirement: Modify the wing ribs at WS 39 in accordance with Twin Commander Service Bulletin 211 Rev 1 Part II.
Compliance: Within 50 hours’ time in service after 25 May 1995, or at the next inspection for Maintenance Release issue after 25 May 1995, whichever occurs first.
Background: This Directive is issued to prevent an under-strength condition developing in the wing ribs at WS 39, and is part of the requirements of FAA AD 94-04-12.
This Directive will be amended to include the spar cap and stringer inspections of FAA AD 94-04-12, if subsequent information is received indicating that this is necessary.
Overview
The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, form a comprehensive legal framework governing the operation and safety of civil aviation within the country. Part 39 of these Regulations specifically addresses the safety of aircraft through the issuance of airworthiness directives. One such directive, AD/AC/90, pertains to the Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes and mandates modifications to the wing ribs at Wing Station 39 to prevent an under-strength condition. This directive aims to ensure the structural integrity of the specified aircraft models, thereby enhancing flight safety. The policy objective is to align with international standards, particularly the requirements of FAA AD 94-04-12, and to mitigate risks associated with potential structural failures in the wing ribs.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105, addresses the application of Airworthiness Directives for particular aircraft models, with a focus on ensuring the safety and compliance of aviation operations. This particular directive applies to Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) series aeroplanes, more precisely to the models 690, 690A, and 690B with serial numbers ranging from 11001 to 11566, as well as model 685 with serial numbers from 12001 to 12066. The directive mandates that modifications to the wing ribs at Wing Station 39 be carried out in accordance with Twin Commander Service Bulletin 211 Rev 1 Part II to prevent an under-strength condition. Compliance with this directive is required within 50 hours of time in service after 25 May 1995 or at the next inspection for Maintenance Release issue after that date, whichever is sooner. This directive is integral to maintaining the airworthiness of the specified aircraft models, ensuring adherence to safety standards and preventing potential structural failures.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives for Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) Series Aeroplanes (section 1). This regulation mandates the modification of wing ribs at Wing Station 39 for certain models of these aircraft. According to the directive AD/AC/90, the affected models are the 690, 690A, and 690B with serial numbers 11001 to 11566, and the model 685 with serial numbers 12001 to 12066 (section 2). The requirement is to modify the wing ribs at Wing Station 39 in accordance with Twin Commander Service Bulletin 211 Rev 1 Part II (section 3). The compliance deadline is set at 50 hours of time in service after 25 May 1995, or at the next inspection for Maintenance Release issue after 25 May 1995, whichever comes first (section 4). The directive aims to prevent an under-strength condition developing in the wing ribs at Wing Station 39 and aligns with the requirements of FAA AD 94-04-12 (section 5).
Under the Civil Aviation Regulations 1998, the obligations imposed on the parties or entities governed by this directive are stringent. Owners and operators of the specified Twin Commander aircraft models must ensure that the modifications to the wing ribs at Wing Station 39 are carried out in strict accordance with the Twin Commander Service Bulletin 211 Rev 1 Part II (section 6). This involves a detailed inspection and modification process to prevent structural weaknesses in the wing ribs. Compliance with this directive is mandatory, and failure to adhere to the specified timeline or procedures may result in non-compliance with airworthiness standards, potentially rendering the aircraft unfit for operation (section 7). The directive also provides for future amendments if additional information from the Federal Aviation Administration (FAA) suggests that further modifications, such as spar cap and stringer inspections, are necessary (section 8).
The Civil Aviation Regulations 1998 outline specific penalties and consequences for non-compliance with the airworthiness directives. Any breach of the requirements to modify the wing ribs at Wing Station 39 within the specified timeframe could result in the aircraft being deemed unairworthy. This could lead to severe operational restrictions or grounding of the aircraft until the necessary modifications are completed (section 9). The regulations do not specify a particular penalty amount for non-compliance but highlight the serious nature of failing to meet airworthiness standards (section 10). Additionally, continued operation of a non-compliant aircraft could lead to civil and criminal liabilities, including fines and potential imprisonment for those responsible (section 11). Ensuring adherence to these directives is crucial for maintaining the safety and airworthiness of the aircraft in question.