Commonwealth legislation

AD/CF6/9 - High Pressure Turbine Impeller Spacer Eddy Current Inspection

In ForceCTH

Jurisdiction

Commonwealth

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legislative instrument

Plain English Summary

4/10 complexity

This AD requires operators of GE CF6‑50 and CF6‑45 engines to carry out an eddy‑current inspection of high‑pressure turbine impeller spacers per GE Service Bulletin SB72‑906 and to remove spacers that fail the inspection. Compliance follows FAA AD 87‑23‑06 (paras (a)–(d)).

The rule places inspection timing and removal obligations on operators and maintenance organisations, imposing tighter initial and repetitive intervals than GE set. Operators pay for inspections, specialised testing equipment and replacement parts; CASA enforces the AD (Requirement; Compliance; Background).

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AD/CF6/9 - High Pressure Turbine Impeller Spacer Eddy Current Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source General Electric Turbine Engines - CF6 Series

AD/CF6/9 High Pressure Turbine Impeller Spacer Eddy Current Inspection

Applicability: CF6-50/-45 Series.

2/88 TX

Requirement: Eddy current inspection of impeller spacers in accordance with General Electric Service Bulletin SB72-906 and their removal from service.

Compliance: In accordance with paras (a), (b), (c) and (d) of FAA AD 87-23-06 General Electric: Amendment 39-5746, effective from 1 December 1987.

Background: Fatigue cracks attributed to high stress low cycle fatigue (LCF) can originate in bolt holes on certain GE CF6-50 and -45 impeller spacers. These components have been subject to special inspection in the past but now must be subject to a particular eddy current inspection process specified in GE Service Bulletin 72-906. The FAA has imposed more stringent initial and repetitive inspection periods on the components than those specified by GE, and it specifies requirements for their removal from service. This AD supersedes AD/CF6/4.

Source text

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