COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes
AD/DHC-8/52 Brake Valve Shuttle Valve Inspection 6/98
Applicability: DHC-8 Aircraft Serial Numbers 003 through 498.
Requirement: Perform inspection and replacement as applicable of brake shuttle valve part number 5084-1 in accordance with manufacturer’s Service Bulletin No. A8-32-139, dated
8 October 1997 or Rev A dated 19 December 1997.
Note: Transport Canada AD CF-98-05 dated 02 March 1998 refers.
Compliance: Within 90 days of the effective date of this directive.
This airworthiness directive becomes effective on 21 May 1998.
Background: Defective filters inside shuttle valve part number 5084-1 have failed in service causing blockage of a brake valve port and subsequent failure of the brake to release after selection. The defect has been traced to a specific batch of filter fittings which have been installed in a specific range of shuttle valves. The affected shuttle valves are used in the hydraulic systems of the DHC 7 and DHC 8 aircraft models. This directive inspects for, and removes from service, affected shuttle valves in the DHC 8 aircraft.
Overview
The Civil Aviation Safety Authority (CASA) introduced the Civil Aviation Regulations 1998 to ensure the safety of civil aviation in Australia. Part 39 - 105, specifically the Airworthiness Directive AD/DHC-8/52, addresses a critical issue concerning the Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes, focusing on the brake valve shuttle valve inspection. This directive applies to DHC-8 aircraft with serial numbers ranging from 003 to 498. The problem it aims to resolve involves defective filters within the brake shuttle valve part number 5084-1, which have caused blockages leading to brake failures. This directive mandates inspections and necessary replacements as per the manufacturer’s Service Bulletin No. A8-32-139, with compliance required within 90 days of its effective date of 21 May 1998. The policy objective is to mitigate safety risks associated with the identified defect, ensuring the continued airworthiness of the specified aircraft models.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, which are applicable to the Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes. This directive, AD/DHC-8/52, applies to all DHC-8 aircraft with serial numbers ranging from 003 through 498. The regulation mandates the inspection and, if necessary, the replacement of the brake shuttle valve part number 5084-1, in accordance with the manufacturer's Service Bulletin No. A8-32-139 dated 8 October 1997 or its revised version dated 19 December 1997. The directive was prompted by instances of defective filters within the shuttle valve, which have led to blockages of brake valve ports and subsequent brake release failures. Compliance with this airworthiness directive is required within 90 days from its effective date of 21 May 1998. The directive references Transport Canada AD CF-98-05 dated 2 March 1998 for additional context. This regulation applies nationally and is enforced by the Civil Aviation Safety Authority across the Commonwealth of Australia.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, addresses the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives for the Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes, focusing on the AD/DHC-8/52 (section 6/98). This directive mandates a thorough inspection and, where necessary, the replacement of the brake shuttle valve part number 5084-1 in accordance with the manufacturer's Service Bulletin No. A8-32-139, dated 8 October 1997, or its revision dated 19 December 1997. The directive applies to DHC-8 aircraft with serial numbers ranging from 003 to 498. The compliance deadline is set within 90 days from the effective date of the directive, which is 21 May 1998.
The primary requirement of this airworthiness directive is to ensure that the shuttle valve part number 5084-1, which has been found to have defective filters leading to blockages and brake failures, is inspected and replaced as necessary. The defective filters have been traced to a specific batch of filter fittings installed in a range of shuttle valves used in the hydraulic systems of DHC 7 and DHC 8 aircraft models. The directive references Transport Canada's AD CF-98-05 dated 2 March 1998, indicating alignment with international safety standards and recommendations.
Entities governed by this directive are required to comply with the specified inspection and replacement procedures within the stipulated timeframe. This involves detailed examination of the shuttle valves, identification of any affected parts, and replacement of defective components to ensure the continued airworthiness and safety of the aircraft. The directive underscores the importance of adhering to the manufacturer's guidelines, as outlined in the referenced service bulletins, to rectify the identified safety issue promptly.
Failure to comply with the requirements of this airworthiness directive may result in significant consequences. Civil or criminal penalties could be imposed for non-compliance, which may include fines or other sanctions as prescribed by the Civil Aviation Regulations. The exact penalties may vary depending on the severity of the breach and the regulatory framework in place, but the directive's emphasis on safety and compliance leaves little room for non-compliance without facing substantial repercussions. Ensuring adherence to these regulations is crucial to maintaining the safety standards required by CASA.