Commonwealth legislation

AD/CFM56/5 - High Pressure Compressor 1-2 Spool

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This AD requires operators of CFM56-5-A engines fitted with No.3 bearing aft air/oil seal P/N 1364M71G02 to inspect and, where required, replace that seal per CFM56‑5 Service Bulletin 72‑440 Rev.1. It was issued because seal-to-disc contact can rub the stage‑1 HPC disc bore, risking disc damage or uncontained failure. The compliance burden (inspection, parts, downtime) falls on operators/engine owners.

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AD/CFM56/5 - High Pressure Compressor 1-2 Spool

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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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.

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.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/CFM56/5 - High Pressure Compressor 1-2 Spool