Commonwealth legislation

AD/CF6/6 - First Stage High Pressure Turbine Disc Embossment Radii

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This airworthiness directive requires removal from service of specified first-stage high-pressure turbine discs on General Electric CF6‑45 and CF6‑50 engines and their return to the manufacturer for inspection of the forward and aft embossment radii. The discs are identified by serial number in GE Service Bulletin A72‑859 Rev 1 and must be inspected before reaching 5,500 cycles since new. The manufacturer says embossment radii may contain stress risers that could shorten disc life. Operators bear removal, return and downtime costs; the regulator enforces compliance.

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AD/CF6/6 - First Stage High Pressure Turbine Disc Embossment Radii

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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/CF6/6 First Stage High Pressure Turbine Disc Embossment Radii

Applicability: CF6-45, -50 Series engines.

8/86

Requirement: Remove from service, first stage high pressure turbine discs identified by serial number in General Electric S.B. A72-859, Rev 1, and return to manufacturer for inspection of both the forward and aft embossment radii.

Reference Document - FAA AD 86-12-03, Amdt 39-5311.

Compliance: Prior to 5,500 cycles disc life since new.

Background: This Directive has been issued to require removal from service, certain first stage high pressure turbine discs. The manufacturer advises, the discs may contain stress risers which could adversely affect the service life of the disc.

Source text

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