COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
British Aerospace BAe 125 Series Aeroplanes
AD/HS 125/97
Amdt 1
Auxiliary Bracket Rear Engine Mount 7/89
Applicability: All models fitted with Garrett TFE 731-3 engines. Requirement: 1. Action in accordance with BAe SB 72-1-2844A Rev 2.
2. Retire from service auxiliary mounting bracket engine attachment bolt P/N 3073361-1.
Note: BAe 125 SB 72-4 refers.
Compliance: 1. Prior to 28 February 1989.
2. Prior to accumulating 750 hours component time in service or within 50 hours component time in service after 13 July 1989, which ever is later.
Background: Weld failures subsequent to inspection in accordance with Garrett SBs TFE 731-72- 3159 and TFE 731-72-3309 have occurred without any report of contributing incident and/or any indication that a failure has occurred. The engine manufacturer has indicated that the failure mechanism appears to be one that has not previously been encountered.
Garrett have now imposed a retirement life on the affected bolt.
Overview
The Civil Aviation Regulations 1998, which are administered by the Civil Aviation Safety Authority (CASA), address various aspects of civil aviation safety, including the issuance of airworthiness directives. One such directive, AD/HS 125/97 Amendment 1, pertains to the British Aerospace BAe 125 Series aeroplanes, specifically those fitted with Garrett TFE 731-3 engines. This directive was introduced to mitigate the risk of weld failures in the auxiliary mounting bracket rear engine mount. The problem it was designed to address is the occurrence of weld failures in the specified component without prior incidents or indications of failure, as identified by the engine manufacturer. The policy objective behind this directive is to ensure the continued airworthiness and safety of the affected aircraft by mandating specific actions and retirement of certain components. Compliance with this directive is mandatory and must be adhered to within specified timelines to maintain the safe operation of the aircraft.
Scope and Application
The Civil Aviation Regulations 1998, specifically under Part 39 - 105, applies to all operators of British Aerospace BAe 125 Series aeroplanes fitted with Garrett TFE 731-3 engines. This regulation mandates compliance with Airworthiness Directives to ensure the continued safety and airworthiness of these aircraft. The directive addresses the auxiliary bracket rear engine mount and requires operators to follow the British Aerospace Service Bulletin SB 72-1-2844A Rev 2, including the retirement of the auxiliary mounting bracket engine attachment bolt P/N 3073361-1, with reference to BAe 125 SB 72-4. The requirement stipulates that all specified actions must be completed before a specified date or before the component reaches a certain number of hours in service, whichever is later. This directive is part of a broader regulatory framework aimed at preventing potential weld failures identified in the auxiliary mounting bracket of the engine. The regulation applies nationally across the Commonwealth of Australia, and it is enforced by the Civil Aviation Safety Authority.
The scope of the directive is clear and specific, targeting all BAe 125 Series aeroplanes with the specified engine type. Compliance must be achieved by adhering to the manufacturer’s service bulletins and retiring the specified component. There are no exclusions or exemptions mentioned in the directive itself, and it is understood that compliance is mandatory for all affected aircraft operators. The directive’s application is enforced through the overarching Civil Aviation Regulations 1998, and further details or extensions to its application may be provided through subordinate instruments or additional service bulletins issued by the relevant authorities.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes a Schedule of Airworthiness Directives that governs the safety standards for civil aviation in Australia. Under this legislative instrument, AD/HS 125/97 Amendment 1 pertains to the auxiliary bracket rear engine mount of British Aerospace BAe 125 Series aeroplanes fitted with Garrett TFE 731-3 engines. This directive mandates compliance with British Aerospace Service Bulletin (BAe SB) 72-1-2844A Revision 2, which outlines the necessary action to be taken, including the retirement of the auxiliary mounting bracket engine attachment bolt part number 3073361-1 (Section 1). Additionally, BAe Service Bulletin 72-4 is referenced in the note section, further detailing the requisite actions.
The Act imposes specific obligations on the operators and maintainers of the BAe 125 Series aeroplanes. They must ensure compliance with the directive by taking action in accordance with BAe SB 72-1-2844A Rev 2. This involves retiring the specified bolt either before 28 February 1989 or before the component accumulates 750 hours of service time, whichever is later. If the component is placed back into service after 13 July 1989, it must be retired within 50 hours of component time in service (Section 1). These requirements are designed to mitigate the risk of weld failures, as highlighted by the engine manufacturer's observations.
Failure to comply with the provisions outlined in AD/HS 125/97 Amendment 1 could result in serious safety implications. The Civil Aviation Safety Authority (CASA) may impose penalties for non-compliance. While the specific penalties are not detailed in the text, such breaches could lead to enforcement actions under the Civil Aviation Act 1988, potentially including fines or other regulatory measures. Operators and maintainers must ensure adherence to these directives to avoid any potential civil or criminal liability stemming from non-compliance.