Commonwealth legislation

AD/CF6/40 - Fan Mid Shaft

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires removal from service of specific General Electric CF6‑80C2 fan mid shafts (Part Nos. 9326M74P04 and 9326M74P05) according to set cycle‑count limits. (Applicability; Requirement; Compliance.)

The CASA delegate issued the directive after FAA component test data indicated a lower allowable life (Background). Aircraft operators must monitor cycles‑since‑new and retire affected shafts within the tiered deadlines, bearing the replacement, maintenance and downtime costs; compliance timing depends on each shaft’s existing CSN. (Compliance.)

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AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/CF6/40 Fan Mid Shaft 7/2000

Applicability: General Electric CF6-80C2 series turbofan engines incorporating fan mid shafts, Part No. 9326M74P04 or 9326M74P05.

Requirement: Remove affected fan mid shafts from service.

Note 1: FAA AD 2000-03-04 also refers.

Note 2: General Electric SB’s CF6-80C2 SB 72-750 and CF6-80C2 SB 72-958 also refer.

Compliance: For mid shafts that have accumulated 9,000 or more cycles since new (CSN) as of the effective date of this Directive remove from service within 3,500 cycles in service (CIS) or prior to accumulating 15,000 CSN, whichever occurs first.

For mid shafts that have accumulated 1,800 CSN or more, but less than 9,000 CSN as of the effective date of this Directive, remove from service within 5,000 CIS or prior to accumulating 12,500 CSN, whichever occurs first.

For mid shafts that have accumulated less than 1,800 CSN as of the effective date of this Directive remove from service prior to accumulating 6,800 CSN.

This Airworthiness Directive becomes effective on 13 July 2000.

Background: The FAA advises that recent component test data requires removal of certain fan mid shafts from service at a revised lower cycle life limit.

Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 2 June 2000

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.