COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes
AD/TB10/21
Amdt 2
Exhaust System Clamp Locknuts 5/97
Applicability: All TB9 aircraft not incorporating HSJ Aviation (HSJ) Engineering Order HSJ 1289 or Auto Avia Drawings 92/334/D1 or 92/334/DR Issue 2, and HSJ Engineering Order HSJ 1486.
Requirement: To prevent failure of the exhaust system; inspect, modify and assemble the exhaust system in accordance with the requirements of Socata Service Bulletin No.
SB 10-072-78 Amendment 2.
Note: DGAC Airworthiness Directive 92-152(A)R4 refers.
Compliance: Unless previously accomplished in accordance with Amendment 1 of this Directive; within 50 hours time in service after 24 April 1997, and thereafter at each disassembly of the exhaust system.
This Amendment becomes effective on 24 April 1997.
Background: This Directive was originally issued to address concern for the integrity of the TB9 exhaust system following two TB10 in-flight exhaust system separation events in Australia. Amendment 1 of the Directive reflected the manufacturer's revision to the part numbers of the replacement exhaust pipe and the long manifold to exhaust clamps. This amendment reflects the manufacturer’s second revision to the requirement document. The revision, in part, introduces a new exhaust pipe to engine cylinder seal part number and revises the exhaust assembly torque data.
Amendment 1 of this Airworthiness Directive became effective on 28 March 1996. The original issue of this Airworthiness Directive became effective on 26 May 1994.
Overview
The Civil Aviation Regulations 1998, specifically under PART 39 - 105, addresses safety issues related to airworthiness directives for various aircraft types, including the Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes. This legislative instrument was enacted to ensure the safety and airworthiness of civil aircraft in Australia. The Civil Aviation Safety Authority (CASA) under the Civil Aviation Act 1988 is responsible for overseeing the safety and airworthiness of aircraft. The policy objective of this regulation is to mitigate risks associated with aircraft operations by implementing safety directives that mandate specific maintenance and modification procedures to prevent failures and enhance operational safety. This particular Airworthiness Directive aims to address the integrity of the exhaust system in TB9 aircraft, following incidents where the exhaust system failed in flight, thus requiring regular inspections and modifications to prevent recurrence.
Scope and Application
The Civil Aviation Regulations 1998, specifically PART 39 - 105, mandates the application of the Civil Aviation Safety Authority Schedule of Airworthiness Directives concerning Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes. This legislation applies to all TB9 aircraft that do not already incorporate HSJ Aviation (HSJ) Engineering Order HSJ 1289 or Auto Avia Drawings 92/334/D1 or 92/334/DR Issue 2, and HSJ Engineering Order HSJ 1486. The directive aims to prevent failure of the exhaust system by requiring inspections, modifications, and assembly of the exhaust system in accordance with Socata Service Bulletin No. SB 10-072-78 Amendment 2. Compliance with this directive is mandatory unless the required modifications were already performed under Amendment 1 of this Directive, in which case the inspections and modifications must be conducted within 50 hours of time in service after 24 April 1997, and at each subsequent disassembly of the exhaust system. The regulation's geographic reach is national, applying throughout Australia as part of the Commonwealth's aviation safety oversight. This directive is an amendment to existing regulations, reflecting updates from the manufacturer to address safety concerns identified by the Civil Aviation Safety Authority.
Key Provisions
The Civil Aviation Regulations 1998, under PART 39 - 105, specifically addresses the safety of Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes through Airworthiness Directive AD/TB10/21 Amendment 2. This directive, effective from 24 April 1997, mandates that all TB9 aircraft not incorporating HSJ Aviation (HSJ) Engineering Order HSJ 1289 or Auto Avia Drawings 92/334/D1 or 92/334/DR Issue 2, and HSJ Engineering Order HSJ 1486, must undergo inspection, modification, and reassembly of their exhaust systems. This is to prevent any failure of the exhaust system, in accordance with Socata Service Bulletin No. SB 10-072-78 Amendment 2. It is imperative that this inspection and modification be completed within 50 hours of time in service after 24 April 1997, and also at each disassembly of the exhaust system thereafter.
This directive imposes specific obligations on the aircraft operators and maintenance personnel. They must ensure that the exhaust system is inspected and modified according to the detailed requirements of the Socata Service Bulletin No. SB 10-072-78 Amendment 2. This includes adhering to the specifications for the replacement exhaust pipe, long manifold to exhaust clamps, and the new exhaust pipe to engine cylinder seal part number. Furthermore, the exhaust assembly torque data must be meticulously followed to prevent any structural failures. These obligations are intended to uphold the safety standards set forth by the Civil Aviation Safety Authority and to prevent the recurrence of in-flight failures such as the separation of the exhaust system.
Failure to comply with this Airworthiness Directive can lead to serious consequences. The regulations do not explicitly state the penalties for non-compliance; however, breaches of Civil Aviation Regulations can result in significant legal and financial repercussions. Operators and maintenance personnel may face enforcement actions, including fines and potential grounding of the aircraft, which could disrupt operations and incur additional costs for compliance. Additionally, any in-flight incidents arising from non-compliance could lead to severe civil and criminal liabilities, potentially resulting in prosecution and imprisonment. The exact penalties are subject to the broader provisions of the Civil Aviation Act 1988 and the specific circumstances of the non-compliance.