COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
CFM International Turbine Engines - CFM56 Series
AD/CFM56/5 High Pressure Compressor 1-2 Spool 5/95
Applicability: All CFM56-5-A Series engines incorporating No.3 bearing aft air/oil seal, P/N 1364M71G02.
Requirement: 1. Inspect affected engines in accordance with CFM56-5 Service Bulletin 72-440, Revision 1.
2. Replace No.3 bearing aft air/oil seal, P/N 1364M71G02, in accordance with CFM56-5 Service Bulletin 72-440, Revision 1.
Note: DGAC AD 94-272(B)R1 also refers.
Compliance: As detailed in the Requirement Document effective from 27 April 1995.
Background: It has been determined that a lack of running clearance may exist between the referenced stationary No.3 bearing aft air/oil seal and the stage 1 HPC disc bore. There is a potential for contact between the two parts in service which will result in rubbing/scratching of the disc bore forward corner. Such damage could lead to an uncontained failure of the disc.
Overview
The Civil Aviation Regulations 1998, amended through F2006B08530, address the problem of potential structural integrity issues in CFM56-5-A Series engines, specifically relating to the No.3 bearing aft air/oil seal. Enacted by the Australian Parliament, this regulation aims to ensure the safety of civil aviation by mandating the inspection and replacement of the affected air/oil seal to prevent damage to the high-pressure compressor disc. The policy objective is to mitigate the risk of uncontained engine failures that could endanger flight safety. The amendments were made effective from 27 April 1995, requiring compliance with specific service bulletins to maintain the airworthiness of the engines in question.
Scope and Application
The Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives (AD) under the Civil Aviation Regulations 1998, specifically AD/CFM56/5, applies to all CFM56-5-A Series engines that incorporate the No.3 bearing aft air/oil seal with part number 1364M71G02. This regulation is imperative for ensuring the airworthiness and safety of civil aircraft operating within the Commonwealth of Australia, thus affecting the aviation industry and entities that maintain and operate such aircraft engines. The directive mandates inspections and replacements of the identified engine components to prevent potential uncontained failures due to rubbing and scratching of the stage 1 High Pressure Compressor (HPC) disc bore. Compliance with these directives is crucial for all relevant stakeholders, including aircraft maintenance organisations and operators, to maintain the safety standards required by CASA. The scope of this legislation is strictly technical and industry-specific, focusing solely on the identified engines and components, with no stated exclusions or exemptions in the text provided. The regulation extends its reach through the mandated service bulletins and compliance dates, ensuring that the required actions are implemented effectively and uniformly.
Key Provisions
The key operative sections of the Civil Aviation Regulations 1998, PART 39 - 106, specifically AD/CFM56/5, detail the requirements for ensuring the airworthiness of CFM56 Series engines, particularly those with the No.3 bearing aft air/oil seal, P/N 1364M71G02. Section 39-106 mandates that all applicable engines must be inspected according to CFM56-5 Service Bulletin 72-440, Revision 1, and the No.3 bearing aft air/oil seal must be replaced under the same guidelines. This directive is effective from 27 April 1995, as per compliance requirements outlined in the Requirement Document.
The obligations imposed by this legislation require that all entities maintaining or operating CFM56-5-A Series engines with the specified No.3 bearing aft air/oil seal must adhere to the inspection and replacement procedures outlined in CFM56-5 Service Bulletin 72-440, Revision 1. This includes ensuring that the inspection is conducted by qualified personnel and that the replacement of the air/oil seal is carried out with the correct part, P/N 1364M71G02. Failure to comply with these requirements could result in the engine not meeting airworthiness standards.
Breaches of these requirements may lead to severe consequences. The Civil Aviation Safety Authority (CASA) has the authority to enforce penalties for non-compliance. Depending on the severity of the breach, penalties may include fines, operational restrictions, or other administrative actions deemed necessary to ensure compliance. While the exact penalties are not specified in the legislation, they could potentially extend to substantial financial penalties and the grounding of non-compliant aircraft until the necessary inspections and repairs are completed.
The potential for contact between the No.3 bearing aft air/oil seal and the stage 1 High Pressure Compressor (HPC) disc bore, which could lead to scratching and subsequent uncontained failure of the disc, underscores the critical nature of these directives. The legislation aims to prevent such failures by ensuring that all affected engines are regularly inspected and maintained to the required standards. Ensuring compliance with these provisions is essential for maintaining the safety and reliability of CFM56 Series engines in operation.
The legislative framework thus ensures that all stakeholders are clearly informed of their obligations and the potential consequences of non-compliance. This clarity is vital for the maintenance of high safety standards in the aviation industry, protecting both the operators and the public from the risks associated with engine failures.