Overview

The Civil Aviation Regulations 1998, under Part 39, introduced specific Airworthiness Directives to address issues related to aircraft safety and maintenance. One such directive, AD/CF6/21, pertains to the eddy current inspection of high-pressure turbine thermal shields for General Electric CF6 Series engines, specifically the CF6-45/-50 series. This directive was enacted to rectify a significant safety concern identified in the high-pressure turbine stage one discs, which were found to be cracked during inspections. Such cracks, if unaddressed, could lead to uncontained engine failure, posing a severe risk to both the aircraft and its occupants. The directive mandates compliance with the Technical Requirements outlined in FAA AD 91-15-16, Amendment 39-7080, and references General Electric Service Bulletin 72-879 Revision 6. The effective date for compliance with these requirements is 28 November 1991, ensuring that all relevant aircraft are inspected and maintained to the specified safety standards.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, specifically within PART 39 - 106, mandates the compliance of certain turbine engines with Airworthiness Directives. This regulation applies to the CF6 series of General Electric turbine engines, more precisely the CF6-45/-50 series engines. These directives ensure that the engines meet necessary safety standards to prevent potential catastrophic failures. The requirement is to adhere to the Technical Requirements outlined in the Federal Aviation Administration (FAA) AD 91-15-16, Amendment 39-7080, with reference to the General Electric Service Bulletin 72-879 Revision 6. The effective date for compliance is set as 28 November 1991, and the directive aims to rectify the identified issue of cracked HPT stage one discs, which could otherwise lead to uncontained engine failure. The geographical scope of this regulation extends nationally, aligning with Australia’s adherence to international aviation safety standards.

Key Provisions

The Civil Aviation Regulations 1998, under Part 39, Section 106, mandate specific directives concerning the airworthiness of certain aircraft components. Specifically, Section AD/CF6/21 addresses the eddy current inspection of high-pressure turbine thermal shields for the CF6 series engines, such as the CF6-45/-50 series (1). This directive is aimed at ensuring that these components are inspected and maintained to prevent potential engine failure. The requirement is to follow the Technical Requirements outlined in FAA AD 91-15-16, Amendment 39-7080, which includes a reference to General Electric Service Bulletin 72-879 Revision 6 for detailed inspection procedures. Compliance with these provisions is critical for all parties involved, including engine manufacturers, operators, and maintenance providers. The directive mandates that inspections be conducted according to the specified technical requirements and must be completed by 28 November 1991, the effective date of the directive (1). The background information provided indicates that the directive was issued due to the discovery of cracks in four high-pressure turbine stage one discs, which, if left unaddressed, could lead to an uncontained engine failure. This underscores the importance of adhering to the prescribed inspection procedures to maintain the safety and airworthiness of the aircraft. Failure to comply with these airworthiness directives can result in serious consequences. The Civil Aviation Regulations 1998 impose strict obligations on the entities governed by these provisions. Non-compliance can lead to significant civil and criminal penalties. For instance, operators who fail to ensure that their aircraft meet the airworthiness standards set out in the regulations may face substantial fines, and in severe cases, their aircraft operating certificates may be revoked. Additionally, manufacturers and maintenance providers who do not adhere to the required inspection and maintenance procedures may also face legal action, including potential criminal charges for endangering the safety of aircraft operations. The potential penalties for non-compliance are severe, reflecting the high stakes involved in aviation safety. Under the Civil Aviation Regulations 1998, the maximum penalties for breaches can include substantial fines and, in some cases, imprisonment. The exact penalties can vary depending on the severity and impact of the non-compliance. For instance, a serious breach that leads to an accident or endangers the safety of an aircraft could result in a fine of up to $500,000 for a corporation, and/or imprisonment for up to five years. These stringent penalties are intended to ensure that all parties take the mandated safety directives seriously and maintain the highest standards of aircraft maintenance and operation.