AD/CF6/51 Amdt 2 - LPT Shroud - Replacement

The Directive operates through a small number of interlocking concepts expressed in the text, each of which determines what conduct is required and what alternatives are permitted.

1. Reference to an external AD as the operative requirement. The instrument requires "Action per the requirements of FAA AD 2003-02-07, Amdt 39-13024." That means the substantive compliance obligations are set out in that FAA AD and the associated requirement document. The Australian AD therefore functions principally as an adoption and local enforcement instrument for the FAA measure.

2. Alternate Means of Compliance (AMOC). The Directive expressly recognises certain parts and service information as AMOCs to specific paragraphs of FAA AD 2003-02-07. The parts and combinations named in the instrument are:

   • Stage 2 LPT shroud 2083M12G02 and stage 3 LPT shroud 2083M13G02 are approved as AMOC to paragraph (b) of FAA AD 2003-02-07.
   • Stage 2 LPT shroud 2092M11G01 is approved as AMOC to paragraph (a) of FAA AD 2003-02-07 provided it is used in conjunction with one of the LPT case parts 1647M68G15 (CF6-80C2 SB72-0946), 2083M94G16 (CF6-80C2 SB 72-1171), or 1647M68G18 (CF6-80C2 SB 72-1170).

3. Manufacturer service information as compliance path. The identified Service Bulletin CF6-80C2 S/B 72-1224 dated 17 August 2006 is the manufacturer data referenced as providing AMOC relief. The Directive also accepts "later revisions to SB CF6-80C2 S/B 72-1224 dated 17 August 2006, approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance (AMOC) to FAA AD 2003-02-07" for compliance. Thus, compliance can be achieved by following the original or later FAA-approved revisions of that specific Service Bulletin.

4. Containment capability as the safety objective. The background section states the purpose: "Actions specified in this Directive improve the Low Pressure Turbine containment capability of the affected engines." That is the explicit safety mechanism the parts or service changes aim to secure.

5. Amendment structure. The instrument is Amendment 2 to an underlying AD (AD/CF6/51). It records that Amendment 1 had previously introduced AMOC options, and Amendment 2 documents acceptance of later revisions of manufacturer data approved as AMOCs.

These concepts translate into a compliance regime that is highly dependent on FAA determinations of AMOC status for particular manufacturer data and parts, and which uses tightly specified part numbers and service bulletin references to define permissible alternatives to the original FAA AD requirements.

The text limits applicability explicitly, and identifies the key decision-makers and data sources involved in compliance.

• Applicability as stated: "General Electric CF6-50 and CF6-80C2 engines as specified in the requirement document." The Directive thus applies to owners, operators, maintenance organisations and other accountable entities responsible for those engines where the requirement document , not reproduced in full in the text supplied , identifies them. The instrument does not set out operational thresholds (flight cycles, installation dates or serial numbers) within the provided text; those details are located in the requirement document and the referenced FAA AD.

• Parties who must implement the actions. While the Directive does not name parties in the form of "the operator must" language in the supplied extract, the AD mechanism conventionally imposes obligations on the operator and the person responsible for continuing airworthiness. The text requires "Action per the requirements of FAA AD 2003-02-07," so any entity to which that FAA AD would apply is affected in the Australian context through this Directive.

• Decision-makers and approvers. The instrument records two sources of approval authority:

  • The United States Federal Aviation Administration, which is the body whose AMOC decisions are relied upon. The Directive accepts later revisions of the manufacturer's Service Bulletin only if the FAA has approved those revisions as AMOC to FAA AD 2003-02-07 ("Later revisions to SB ... approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance ... are considered acceptable for compliance with the equivalent Requirements of this AD").
  • The Civil Aviation Safety Authority, through the delegate who issued the AD, Mike Higgins. CASA is the issuer of the Directive in Australia and sets the effective date and amendment status.

• The manufacturer. General Electric is the parts supplier and service bulletin author. The Background notes that the manufacturer "has developed other parts that have approved for fitment in lieu of those parts originally specified in FAA AD 2003-02-07." The manufacturer's role is to design parts (shrouds and possibly LPT cases) and to issue service bulletins which may be approved by the FAA as AMOCs.

• MROs and maintenance organisations. Although the instrument does not name them, any maintenance organisations performing the LPT shroud replacements or installations will be the practical implementers of the required actions and must follow the service information described.

In sum, the AD affects operators and maintenance entities responsible for CF6-50 and CF6-80C2 engines identified in the requirement document, with compliance contingent on manufacturer parts and FAA approval decisions, and with CASA adopting and enforcing the FAA-derived requirement for Australian-registered aircraft.

The Directive defines duties and affords limited rights by recognising alternate compliance paths. The duties and rights in the supplied text are these.

Duties

• Follow the requirement document: The core duty is to "Action per the requirements of FAA AD 2003-02-07, Amdt 39-13024." The Directive imports the FAA AD requirements as the substantive compliance obligations. The requirement document (not reproduced in full in the supplied text) sets the detailed actions to be taken.

• Comply with effective date: The AD becomes effective on 3 September 2010. Any compliance timetable or mandatory action windows set in the requirement document or FAA AD would operate against that effective date.

• Use specified combinations where AMOC is conditional: Where the AD approves an AMOC for a part only when used with a particular LPT case, the operator must ensure that the specified parts are used in the approved combination. For example, stage 2 LPT shroud 2092M11G01 is approved as an AMOC to paragraph (a) of FAA AD 2003-02-07 only if used with LPT case 1647M68G15, 2083M94G16, or 1647M68G18 (each cross-referenced to specific CF6-80C2 service bulletins).

Rights

• Use of specified AMOCs: The AD grants the right to comply with the FAA AD by using alternative parts and service information listed as AMOCs, specifically stage 2 LPT shroud part numbers 2083M12G02, 2092M11G01 and stage 3 LPT shroud 2083M13G02, subject to the conditions noted.

• Use of later FAA-approved SB revisions: The AD permits the use of "later revisions to SB CF6-80C2 S/B 72-1224 dated 17 August 2006, approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance" for compliance with the equivalent requirements of this AD. In practice, that gives operators the right to adopt FAA-approved updates to the SB as they become AMOCs without needing a separate Australian amendment for each later revision.

Limitations and conditions

• Conditional approvals: The right to use an AMOC is conditional on FAA approval where that approval is expressly referenced. For the AMOC status of later revisions, the AD accepts them only if they have FAA AMOC approval.

• Scope of applicability: The AD only applies to the specified engine models as set out in the requirement document; it does not claim to apply to other engine types or configurations outside that scope.

• No allocation of cost or implementation responsibility is stated in the supplied text. The Directive requires action but does not specify who pays for replacements, installation, or downtime.

Taken together, these provisions create a duty to comply with the FAA AD as adopted in the requirement document, while giving specified, conditional alternatives in the form of manufacturer parts and FAA-approved service bulletin revisions that can be used to meet those duties.

The supplied text does not specify monetary penalties, criminal sanctions, or administrative fine regimes. The AD does not include express enforcement clauses or penalty provisions in the extract provided. Consequently the Directive itself, as printed, sets out compliance obligations and approved AMOCs without stating what penalties apply for non-compliance.

What the instrument does specify in enforcement-related terms is limited to procedural and administrative actions:

• Adoption of the FAA AD as the operative requirement. By directing "Action per the requirements of FAA AD 2003-02-07," the AD imports whatever compliance deadlines, inspections and actions the FAA AD prescribes. Any enforcement consequences that attach under the FAA AD itself are not reproduced in the supplied text of the Australian AD.

• Acceptance of FAA-approved AMOCs. The AD recognises FAA approvals as determinative for accepting later manufacturer data or Service Bulletin revisions as lawful paths to compliance under this Australian AD. This creates an administrative acceptance mechanism rather than an alternative domestic approvals process in the text supplied.

What is not stated

• No domestic penalty mechanism. The AD text supplied does not spell out CASA enforcement powers, infringement notices, administrative penalties, suspension or grounding orders, or criminal liability for failing to comply. The AD does not state whether non-compliance will lead to specific CASA actions.

• No compliance-documentation or continuing-airworthiness documentation requirements are specified in the extract. The AD does not state what records must be held or produced to demonstrate compliance, nor does it set out audit or reporting obligations in the supplied text.

Implication for affected parties

• Because the AD imports an FAA AD as the operative requirement and recognises FAA AMOC approvals, operators should assume the need to meet those obligations and to be prepared to demonstrate compliance if queried by the regulator, but the supplied Directive text itself does not provide the enforcement details or penalties. Any specific enforcement consequences and penalty procedures are not set out here.

In short, the AD imposes duties and authorises AMOCs, but the text supplied does not set out penalties or the detailed enforcement mechanism; those matters are outside the immediate language of this extract.

The Directive expressly cross-references and depends on an external foreign regulatory instrument and manufacturer service information. Within the supplied text the key interactions are these.

Direct cross-reference to FAA AD

• The Directive requires action in accordance with "FAA AD 2003-02-07, Amdt 39-13024." That is the primary legal and technical standard imported by the Australian AD. The Australian instrument treats the FAA AD as the baseline set of requirements to be complied with by Australian operators of the affected engines.

Dependence on FAA AMOC approvals

• The AD accepts as compliant later revisions of the manufacturer's Service Bulletin only if those revisions "are approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance (AMOC) to FAA AD 2003-02-07." This establishes an interaction in which the FAA’s determinations regarding the acceptability of specific service bulletin revisions as AMOCs are directly binding for Australian compliance under this AD.

Manufacturer service information as regulatory input

• The Service Bulletin identified (CF6-80C2 S/B 72-1224 dated 17 August 2006) and other service bulletins referenced for LPT cases (CF6-80C2 SB72-0946, SB 72-1171, SB 72-1170) are incorporated into the compliance regime as the technical means to satisfy the FAA AD in Australia. The AD therefore interacts with the domain of manufacturer-generated technical data.

Domestic regulatory adoption

• The instrument is an Australian AD issued by the Civil Aviation Safety Authority (through its delegate Mike Higgins). In substance it is an adoption of a foreign AD and associated AMOC approvals for Australian regulatory effect. The supplied text does not reproduce or quote domestic aviation legislation or CASA’s enforcement powers; it performs a functional interaction by importing FAA requirements and AMOC approvals into the national AD framework.

What is not covered in the supplied text

• The AD does not expressly discuss interaction with other Australian regulatory instruments, such as Civil Aviation Safety Regulations, continuing airworthiness obligations, or certificating rules. Those interactions are not present in the text provided.

• The AD does not address contractual relationships, warranties, or supply-chain obligations that could exist between operators and the manufacturer or maintenance organisations; those interactions are therefore beyond the explicit scope of the instrument as presented.

Overall, the supplied Directive creates a cross-jurisdictional regulatory link: Australian compliance obligations for the affected engines are defined by reference to a specific FAA AD and to FAA determinations about manufacturer service bulletin revisions, with CASA issuing the Australian AD to give effect to those obligations domestically.

The text of the instrument identifies successive amendments and the substance of those amendments in summary form. The supplied extract provides the following history.

• Original AD: The document is titled AD/CF6/51. The supplied extract does not reproduce the original issuance date or the full text of the initial AD; it does indicate that this instrument is an amendment series, now at Amendment 2.

• Amendment 1: The supplied text states that "Amendment 1 adds an alternative means of compliance. The manufacturer has developed other parts that have approved for fitment in lieu of those parts originally specified in FAA AD 2003-02-07." That records that the first amendment introduced AMOC options based on manufacturer-developed parts that serve as alternatives to the parts specified in the original FAA AD.

• Amendment 2 (this instrument): The top of the document is labelled "AD/CF6/51 Amdt 2" and the body states "Amendment 2 notates the acceptance of later revisions of the manufacturer’s data which are approved as an AMOC to FAA AD 2003-02-07." The instrument further records the effective date for this amendment: "This Amendment becomes effective on 3 September 2010." The document bears the signature block "Mike Higgins, Delegate of the Civil Aviation Safety Authority, 24 August 2010." The heading also carries the notation "17/2010", which appears to be an internal numbering or publication reference.

• Manufacturer Service Bulletin revisions: The Service Bulletin CF6-80C2 S/B 72-1224 dated 17 August 2006 is the baseline AMOC source named in the AD. The Amendment 2 expressly accepts "later revisions to SB CF6-80C2 S/B 72-1224 dated 17 August 2006, approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance (AMOC) to FAA AD 2003-02-07" for compliance under this AD. That creates a mechanism for the AD to remain current with FAA-approved SB revisions without Australian re-issuance for each revision.

What is not provided

• The text does not include the date of the original AD/CF6/51 issuance, nor does it include the full text of Amendment 1. It summarises the content of the earlier amendment but does not reproduce it.

• The extract does not include a log of earlier amendments beyond the two-line description of Amendment 1 and the present Amendment 2.

For readers and implementers, the practical significance of this amendment history is that the AD has evolved from a baseline that referenced FAA AD 2003-02-07 to one that recognises manufacturer-developed parts as AMOCs, and now recognises later FAA-approved revisions of the relevant Service Bulletin as acceptable compliance paths.

The supplied AD text contains no information on litigation, disputes, appeals, or judicial review related to this Directive, the underlying FAA AD, the manufacturer’s service bulletins, or the AMOC approvals. There are no cases, enforcement actions, or proceedings referenced in the instrument as presented.

Because the instrument does not include any litigation history or references to disputes, the text provides no basis to describe court decisions, appeal outcomes, or contested enforcement matters. Any litigation history that might exist outside this extract is not recorded here and therefore cannot be summarised or relied upon in this note.

Practically, the absence of litigation references in the AD means users must look beyond this specific document, to CASA records, FAA records, or judicial databases, for any adjudicative history about these parts, the AD, or associated compliance controversies; such external research is not contained in the text supplied.

This section flags precise technical and administrative details in the instrument that may trip up implementers, as set out in the supplied text.

1. Applicability is conditional on the requirement document. The AD’s applicability line reads: "General Electric CF6-50 and CF6-80C2 engines as specified in the requirement document." The requirement document (not reproduced here) contains the specific engine serial ranges, configurations, or installation conditions that determine whether an engine is subject to the AD. Implementers must consult the full requirement document referenced by the AD to determine applicability; the summary here does not replace that step.

2. AMOC approvals are part-number and combination specific. The AD does not generically approve any shroud or case; it names exact part numbers and, in one case, requires a specific combination:

   • 2083M12G02 (stage 2) and 2083M13G02 (stage 3) are approved as AMOC to paragraph (b) of FAA AD 2003-02-07.
   • 2092M11G01 (stage 2) is an AMOC to paragraph (a) of FAA AD 2003-02-07 only when used with LPT case 1647M68G15, 2083M94G16, or 1647M68G18 (each tied to particular CF6-80C2 SB numbers). Using a listed shroud with an unlisted or incorrect LPT case may not be an approved AMOC and therefore might not satisfy the AD.

3. Later Service Bulletin revisions are accepted only if FAA-approved as AMOCs. The AD accepts later revisions of SB CF6-80C2 S/B 72-1224 only to the extent those revisions are "approved by the United States Federal Aviation Administration ... as an Alternate Means of Compliance (AMOC) to FAA AD 2003-02-07." A later SB revision without FAA AMOC approval is not accepted by this AD as a compliance path.

4. The AD imports obligations from FAA AD 2003-02-07. Implementers must therefore examine the FAA AD itself. The Australian AD text directs action "per the requirements of FAA AD 2003-02-07," so failure to consult the FAA AD and its paragraphs (including (a) and (b)) may result in incomplete or incorrect compliance.

5. The AD does not allocate costs, nor does it specify documentation or recordkeeping steps. If operators expect guidance on who funds parts, labour or downtime, or what documentary proof to retain, that is not provided in this instrument. The AD requires action but does not state how compliance is to be evidenced administratively in Australia in the supplied extract.

6. Effective date and amendment numbering. This instrument is Amendment 2 and becomes effective on 3 September 2010. Operators must make sure they are referring to the correct Amendment version when deciding what is permitted; consulting earlier versions may miss the AMOC permissions or the acceptance of later SB revisions.

7. Limited scope of the AD text. The supplied extract summarises the key AMOC approvals and the acceptance of later SB revisions, but it does not contain the detailed step-by-step corrective actions, intervals, inspections or repetitive tasks that may be specified in the FAA AD or the requirement document. Those details are essential for technical compliance.

In short, implementers should not treat this summary AD as a self-contained technical work order; rather, it is an integrating instrument that points to the FAA AD, specific part numbers and service bulletin revisions for technical detail, with conditional approvals tied to FAA AMOC status.

The instrument’s text prescribes a clear, limited pathway for compliance; the following is a practical checklist strictly grounded in the AD text supplied.

1. Confirm applicability. Consult the requirement document referenced by the AD to verify whether the specific CF6-50 or CF6-80C2 engine(s) in the operator’s fleet are within the AD’s scope. The AD states applicability as "General Electric CF6-50 and CF6-80C2 engines as specified in the requirement document," therefore the requirement document is the first and necessary source to determine applicability.

2. Read FAA AD 2003-02-07. The AD requires "Action per the requirements of FAA AD 2003-02-07, Amdt 39-13024." Obtain and review that FAA AD, including paragraphs (a) and (b), because the Australian AD imports its substantive obligations.

3. Identify permissible AMOCs and part numbers. The AD lists specific parts as approved AMOCs:

   • Use stage 2 LPT shroud 2083M12G02 and stage 3 LPT shroud 2083M13G02 as an AMOC to paragraph (b) of FAA AD 2003-02-07 where appropriate.
   • Use stage 2 LPT shroud 2092M11G01 as an AMOC to paragraph (a) of FAA AD 2003-02-07 only if it is installed in conjunction with one of the LPT cases 1647M68G15 (CF6-80C2 SB72-0946), 2083M94G16 (CF6-80C2 SB 72-1171), or 1647M68G18 (CF6-80C2 SB 72-1170).

4. Use the identified Service Bulletin(s). The AD references Service Bulletin CF6-80C2 S/B 72-1224 dated 17 August 2006 as the manufacturer data that provides the AMOC parts and instructions. Implement the actions described in that SB where applicable.

5. If using later SB revisions, verify FAA AMOC approval. The AD accepts later revisions of SB 72-1224 only if they are "approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance (AMOC) to FAA AD 2003-02-07." Before relying on a later SB revision, confirm that the FAA has issued AMOC approval for that revision.

6. Observe the AD’s effective date. This Amendment is effective on 3 September 2010. Ensure that work performed and parts installed meet the version and AMOC conditions applicable as of that date.

7. Match parts to required combinations. Where the AMOC approval is conditional on pairing parts (for example, shroud 2092M11G01 with specified LPT cases), confirm that the parts fitted are the exact part numbers named in the AD and SB references.

8. Follow manufacturer installation instructions. While the AD does not reproduce the SB instructions, it requires action per the FAA AD and accepts the SB as an AMOC. Operators should implement the full technical installation and torque, balance, and inspection procedures in the service information when performing replacements.

9. Maintain evidence of compliance (practical step). The AD text does not state documentation requirements in the supplied extract. Nevertheless, as a practical matter for regulatory interactions, maintain records showing:

   • the applicable AD and Amendment used,
   • the Service Bulletin revision and AMOC approval relied upon,
   • parts installed with serial numbers and part numbers,
   • installation dates and maintenance release details. The AD does not itself require these records in the provided text, but they are the natural evidence to demonstrate the specific conditional AMOCs cited.

10. Seek clarification from CASA if uncertain. The AD is issued by CASA and signed by a CASA delegate. If there is any uncertainty about applicability, the status of an AMOC, or acceptance of a particular SB revision, seek formal clarification from CASA rather than relying solely on the summaries in the AD text.

Strictly following the sequence above, and ensuring that any later SB revision used has explicit FAA AMOC approval, will align implementation with the conditions and permissions stated in this Australian AD as supplied.