AD/CF6/28 - CF6-80C2 Stage 1 High Pressure Turbine Disc Inspection

Overview

The Civil Aviation Regulations 1998, specifically Part 39, include Airworthiness Directives designed to ensure the safe operation of aircraft in Australian airspace. The directive F2006B08471, known as AD/CF6/28, was enacted to address the critical issue of uncontained failures in the CF6-80C2 series turbine engines manufactured by General Electric. This particular directive focuses on the requirement for an inspection of the stage 1 high pressure turbine disc rim bolt holes to detect any cracks, with necessary replacements to be carried out using serviceable parts. This directive is a response to a prior uncontained stage 1 high pressure turbine failure and came into effect on 27 June 1994. The policy objective underpinning this directive is to enhance the safety of civil aviation by ensuring that critical engine components are regularly inspected and maintained according to stringent technical standards set forth by the Civil Aviation Safety Authority.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 106, applies to the maintenance and operation of aircraft in Australia, with this particular directive focusing on General Electric CF6 Series turbine engines, specifically the CF6-80C2 variant. The directive mandates an inspection for cracks in the stage 1 high pressure turbine disc rim bolt holes, with any necessary replacement of affected parts in accordance with the technical requirements of FAA AD 94-06-03. The directive is in response to a previous incident involving an uncontained stage 1 high pressure turbine failure and is applicable to all CF6-80C2 engines. It became effective on 27 June 1994, and compliance is necessary for the continued airworthiness of the aircraft utilising these engines. This directive is part of the broader regulatory framework managed by the Civil Aviation Safety Authority, which ensures that aircraft meet safety standards both nationally and in alignment with international standards.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 - 106, contain the Schedule of Airworthiness Directives that govern the safety and compliance of aircraft and their components. One such directive, AD/CF6/28, pertains to the CF6-80C2 engines. Section (1) of this directive states that it applies to CF6-80C2 engines and requires compliance with the technical requirements outlined in FAA AD 94-06-03. The directive references General Electric Service Bulletin No 72-614 Revision 1 and All Operator’s Wire 92-80C-16 of 22 April 1992 for further guidance. It is effective from 27 June 1994. The primary obligation imposed by AD/CF6/28 is that engine operators must conduct an inspection for cracks in the stage 1 high pressure turbine disc rim bolt holes. This requirement ensures that any detected defects are addressed promptly to prevent potential failures. The directive mandates that any necessary replacements must be carried out using serviceable parts, as specified in the referenced FAA and General Electric documents. Failure to comply with these inspection and replacement requirements can result in severe safety risks, potentially leading to an uncontained failure of the turbine. For entities governed by this directive, the obligations are clear: adherence to the inspection and repair protocols is mandatory. This involves detailed checks of the turbine disc rim bolt holes for any signs of cracks and the replacement of parts if any defects are found. The directive underscores the importance of using serviceable parts for repairs, as specified in the referenced documents, to ensure the continued airworthiness and safety of the aircraft. Non-compliance with these requirements may lead to enforcement actions by the Civil Aviation Safety Authority. Violating the provisions of AD/CF6/28 can have serious consequences. Civil penalties may be imposed for non-compliance, including fines and potential legal action. In severe cases where non-compliance results in an uncontained engine failure, the consequences can be catastrophic, leading to criminal charges for individuals or entities responsible. The specific penalties are not detailed in the directive but can include significant fines and imprisonment for those found guilty of breaches that result in safety incidents. The overarching goal of the directive is to ensure that all stakeholders are aware of and comply with the stringent safety requirements to prevent potential hazards.