AD/CF6/62 - High Pressure Turbine Disc

The core legal mechanism of this instrument is an airworthiness directive that imports another jurisdiction’s mandated service actions by reference. The AD does not set out technical instructions itself, it directs regulated parties to "Action per the technical requirements of FAA AD 2006-16-06" (Requirement). The AD’s applicability is likewise delimited by reference to the FAA AD: "General Electric Company (GE) CF6-80 model turbine engines as specified in FAA AD 2006-16-06" (Applicability). The CASA AD therefore functions as a domestic enforcement wrapper around a foreign regulator’s technical mandate.

Key operational concepts explicitly stated in the text include initial inspection as a qualifying step for mandatory rework, repetitive inspections where rework is not required, rework before further flight for certain disks, and outright removal from service of certain CF6-80E1 series disks (Background). The document expressly supersedes a prior CASA AD, AD/CF6/54, which is itself identified with FAA AD 2004-04-07 (Requirement, Background). The supersession is concrete: the AD "supersedes CASA AD/CF6/54" and shortens the compliance schedule for disks not previously inspected under AD/CF6/54 (Background).

From a compliance mechanics standpoint, three structural features are important and explicit in the source. First, the AD’s legal obligations are time-bound: the Compliance entry gives an effective date of 26 October 2006, and the document was issued on 13 September 2006 (Compliance; signature line). Second, the AD differentiates between disks according to their inspection and rework history: those previously inspected under AD/CF6/54 have a different compliance baseline than those that have not (Background). Third, the AD identifies the hazard,cracks originating in dovetail slot bottoms that can propagate to uncontained failure,and links the prescribed inspections and rework to the detection and prevention of that hazard (Background).

Because the AD imports FAA technical requirements, the AD’s substantive content, including any parts lists, serial numbers, compliance intervals, and rework specifications, is located in the referenced FAA document (Requirement: "Action per the technical requirements of FAA AD 2006-16-06"; note that the AD text states "FAA AD 2006-16-06, Amdt 39-14706 refers"). The CASA AD’s own text therefore operates principally to adopt and to alter timing relative to a previously adopted CASA AD.

The AD’s Applicability clause states the affected population: "General Electric Company (GE) CF6-80 model turbine engines as specified in FAA AD 2006-16-06" (Applicability). In practical terms, that identifies aircraft owners and operators who have CF6-80 engines installed, maintenance organisations and approved repair stations that service those engines, aircraft maintenance engineers who will perform inspections and rework, and parts suppliers who provide replacement disks or components for CF6-80 engines. The Background identifies the subject component more narrowly as "certain stage 1 high-pressure turbine (HPT) rotor disks," and notes that certain CF6-80E1 series disks are to be removed from service, indicating that the AD applies to subsets of the model line based on disk configuration or serialisation (Background).

Operators who already complied with the superseded AD/CF6/54 are affected differently from operators who have not previously had their disks inspected under AD/CF6/54. The AD expressly shortens the compliance schedule for HPT disks that have not been previously inspected using AD/CF6/54, therefore increasing near-term obligations for those operators compared with the earlier AD (Background). The AD also retains the regime of initial inspection as a qualification for mandatory rework procedures for certain disks, and repetitive inspections for disks for which rework is not required, so maintenance providers must be able to determine whether a given disk requires rework or only recurring inspection under the FAA AD’s criteria (Background).

Regulators and continuing airworthiness managers at airlines will need to note the effective date, 26 October 2006, for enforcement and planning of maintenance cycles (Compliance). The CASA instrument was issued by a named delegate, James Coyne, on 13 September 2006, indicating the CASA decision-maker for this document (signature block). The AD does not list third-party rights, exemptions, or appeals processes; it identifies obligations by reference to the FAA AD and by supersession of the previous CASA AD. The AD therefore affects decision-making processes within operators: scheduling of inspections, allocation of maintenance resources, decisions whether to rework or remove parts, and procurement of replacement parts for disks removed from service.

Duties

• Follow the technical requirements of FAA AD 2006-16-06, as incorporated by reference in the CASA AD. The Requirement clause states: "Action per the technical requirements of FAA AD 2006-16-06" (Requirement). The CASA AD does not itself list the step-by-step technical actions, so the duty to perform inspections, rework, removals and any record-keeping is discharged by complying with the FAA AD’s text.
• Meet the Compliance timing: the AD takes effect on 26 October 2006, and the AD states compliance is "As specified in the requirement document" (Compliance). Operators must therefore follow the compliance intervals and any accelerated schedule set out in the FAA AD, noting that the CASA AD shortens the compliance schedule for disks not previously inspected under AD/CF6/54 (Background).
• Treat initial inspections as qualifications for mandatory rework for certain disks, conduct repetitive inspections only for disks for which the FAA AD does not require rework, rework certain disks before further flight, and remove certain CF6-80E1 series disks from service, as the Background recounts.

Rights and determinations recorded in the source

• The AD does not articulate explicit rights, exemptions, or appeal mechanisms in this text. It does, however, preserve a substantive distinction based on prior compliance: disks previously inspected under CASA AD/CF6/54 are not subject to the shortened compliance schedule applied to disks not previously inspected (Background). That factual distinction functions as a legal concession to earlier compliance actions, and thus constitutes a benefit to those who complied with the prior AD.
• The AD refers to FAA AD 2006-16-06 and notes that FAA AD 2006-16-06, Amdt 39-14706, "refers" (Requirement, Note 1). This means the detailed determination of which specific parts or serial numbers are affected, the exact inspection technique, and the rework specification are matters contained in the FAA AD, and operators must consult that document to ascertain the precise obligations.

Allocation of responsibilities

• CASA, via this AD, sets the mandatory requirement in the Australian regulatory context by adopting the FAA AD’s technical content and establishing the effective date and supersession. The issuing delegate is James Coyne, as named in the signature block (signature line).
• Operators and maintenance organisations carry the burden of implementing the inspections, rework, removals, and any subsequent recurrent inspections, as these are the measurable actions the AD mandates by reference (Requirement; Background).

The AD’s text does not specify compliance reporting pathways, record retention periods, or penalties for non-compliance within this instrument; it confines itself to importing and enforcing the FAA AD’s technical requirements and adjusting the compliance schedule relative to a prior CASA AD.

The AD text supplied does not set out penalties, sanctions, or the specific enforcement mechanism within the CASA administrative or criminal regime. The document is an Airworthiness Directive, issued by a CASA delegate, and records an effective date and directions to comply with FAA AD 2006-16-06, but it does not contain statutory penalty provisions, infringement notices, or enforcement procedures in its own text. The available entries are limited to Applicability, Requirement, Compliance (effective date), and Background; none of those entries specify how CASA will enforce the AD or what penalties apply for non-compliance.

Because the AD does not include enforcement or penalty text, operators should treat the document as an instrument that imposes mandatory continuing airworthiness duties, and assume that failure to comply may engage the broader enforcement framework applicable to civil aviation safety in Australia. The AD does not reproduce or summarise that broader framework, and it does not list any administrative processes for challenging the AD, nor does it contain any transitional enforcement concessions.

The AD records who issued the document: "James Coyne, Delegate of the Civil Aviation Safety Authority" and a date of 13 September 2006. The identification of a CASA delegate indicates the instrument’s origin within CASA’s administrative machinery, but the AD itself stops short of articulating enforcement pathways. For any actions that depend on enforcement details , for example, whether a non-compliance would be treated as an immediate grounding, an infringement, or a basis for certificate suspension , practitioners must look beyond this AD text to the governing aviation safety legislation and CASA enforcement practice, which are not reproduced in the AD.

In summary, this particular CASA AD mandates action by reference to FAA AD 2006-16-06 and sets an effective date, but it does not, within the text provided, state penalties or enforcement mechanics. The AD’s legal bite therefore derives from its status as a CASA airworthiness directive in the regulatory catalogue, and from the assumption that CASA enforces ADs under its broader statutory powers, but those enforcement powers are not set out in this document.

This CASA AD explicitly interacts with prior CASA ADs and with FAA airworthiness directives. The instrument states it supersedes CASA AD/CF6/54, which it identifies as being associated with FAA AD 2004-04-07 (Requirement; Background). It also expressly imports the technical requirements of FAA AD 2006-16-06, identified in the Requirement field and further noted as "FAA AD 2006-16-06, Amdt 39-14706 refers" (Requirement, Note 1). Mechanically, the CASA AD functions as an amendment to the domestic corpus of ADs by removing the earlier AD/CF6/54 from operative effect and substituting the obligations set by FAA AD 2006-16-06 as the operative technical requirements for the named engines.

The AD thereby creates a direct dependence between Australian continuing airworthiness obligations and FAA-issued service directives for a particular engine model. The CASA instrument does not reproduce the FAA AD text; it adopts its technical content by reference. That means the FAA AD’s parts lists, compliance intervals, and rework instructions will determine the detailed regulatory obligations in Australia once this CASA AD is effective. The AD therefore functions as a domestic instrument that imports foreign technical standards into Australian regulatory effect for the specified equipment.

The AD’s supersession of AD/CF6/54 means operators who complied with the earlier CASA AD must now treat the new AD as the operative requirement and follow the shorter schedule for disks not previously inspected under AD/CF6/54, while those who did comply with AD/CF6/54 receive an altered placement in the compliance timeline, as the document itself distinguishes between disks previously inspected and those not previously inspected (Background).

Beyond these explicit interactions, the AD text does not reference other parts of Australian aviation law, civil liability statutes, or administrative review mechanisms. It does not specify how compliance with the FAA AD intersects with mandatory continuing airworthiness records under Australian regulation, nor does it state how inspectors will reconcile FAA-equivalent data with Australian parts mark or maintenance log requirements. Those interactions are outside the text supplied, and are not addressed in this AD.

In short, the AD’s cross-jurisdictional interaction is concrete and limited: it supersedes a prior CASA AD and imports an FAA AD as the source of technical obligations. Any broader legal interactions with Australian aviation safety statutes, enforcement provisions, or records obligations are not set out in this document.

The AD text supplied identifies one specific amendment relationship. It states that this AD "supersedes CASA AD/CF6/54 (FAA AD 2004-04-07)" and that "FAA AD 2006-16-06, Amdt 39-14706 refers" (Requirement, Note 1; Background). That is the AD’s sole explicit amendment history entry in the supplied text. The Background explains that the prior AD required an initial inspection as a qualification for mandatory rework procedures for certain disks and repetitive inspections only for certain disks for which rework procedures were not required. The current AD requires the same substantive actions but shortens the compliance schedule for HPT disks that have not previously been inspected under AD/CF6/54 (Background).

Dates recorded in the AD supply a temporal sequence. The CASA instrument is dated 13 September 2006, with an effective date of 26 October 2006 (signature and Compliance). The FAA AD that the CASA AD incorporates is identified as FAA AD 2006-16-06, which the CASA text cites and describes as being referenced via Amendment 39-14706 (Requirement). The prior CASA AD is identified by its CASA index AD/CF6/54 and the corresponding FAA AD 2004-04-07 (Background). The supplied text does not include any other amendment entries, earlier drafts, or later amendments.

There is no record within this document of any subsequent CASA amendment to AD/CF6/62. The AD’s own statement that it supersedes AD/CF6/54 constitutes the only change to the CASA AD catalogue reported in the text. Any later amendments, rescissions, or variations post-dating this document are not present in the supplied material and therefore cannot be reported from this source.

In short, the amendment history contained in this document is: AD/CF6/62 (this instrument), issued 13 September 2006, effective 26 October 2006, superseding AD/CF6/54 (which was associated with FAA AD 2004-04-07), and incorporating the technical requirements of FAA AD 2006-16-06 (Amdt 39-14706).

The supplied AD text does not include any litigation history. It is an administrative airworthiness directive and contains no references to court decisions, administrative appeals, or litigation concerning either AD/CF6/54 or the AD being issued here. The document records an issuing delegate and dates, but includes no summary of disputes, stayed enforcement orders, judicial review applications, or case names.

Because the AD text does not mention litigation, there is no source-grounded material in this instrument to describe any legal challenges, appeals or outcomes related to AD/CF6/62 or the superseded AD/CF6/54. Any litigation history, whether before administrative tribunals, courts, or in the form of enforcement proceedings, would need to be sourced from other documents outside the text supplied.

Therefore, based solely on the text provided, there is no recorded litigation history to report. Practitioners seeking any such history must consult CASA records, court databases, or the public record of proceedings that post-date or relate to the issuance and enforcement of this AD, none of which are reproduced here.

1. The AD imports technical requirements by reference, and does not reproduce them. The Requirement field unambiguously states "Action per the technical requirements of FAA AD 2006-16-06" (Requirement). That means the specific inspection methods, non-destructive test techniques, serial-numbered lists, rework drawings, and compliance intervals are not present in the CASA AD text, and must be read from FAA AD 2006-16-06. Treat the CASA AD as a pointer to another document that contains the operative technical obligations.

2. Supersession and prior compliance matter. The Background explains that the new AD "shortens the compliance schedule for HPT disks that have not been previously inspected using AD/CF6/54 (FAA AD2004-04-07), which this AD supersedes" (Background). In practice, whether a disk has been inspected under the earlier AD changes the schedule that applies. Operators must determine and document prior inspection history to establish the correct compliance deadline under the new AD.

3. Different outcomes for disks. The Background specifies three distinct outcomes in the AD regime: (a) initial inspection as a qualification for mandatory rework for certain disks, (b) repetitive inspections for certain disks for which rework is not required, and (c) rework before further flight for certain disks and removal from service for some CF6-80E1 series disks (Background). Operators must classify disks carefully against the FAA AD’s part and serial-number criteria to know which outcome applies.

4. Effective date lag. The AD was issued on 13 September 2006 but set an effective date of 26 October 2006 (signature block; Compliance). Operators must not assume immediate enforcement on issue; the Compliance line identifies the effective date that determines timing, while any accelerated compliance schedules in the FAA AD as referenced will take effect within that framework.

5. No enforcement detail in the AD. The document does not articulate penalties, reporting obligations, or enforcement pathways (Penalties and enforcement). The absence of these details in this text is a potential operational gap: affected parties should not assume a lack of enforcement; rather, they should consult CASA’s broader regulatory framework for enforcement and record-keeping obligations.

6. Narrow applicability language. The Applicability clause ties the Australian applicability to engines "as specified in FAA AD 2006-16-06" (Applicability). If an operator’s engine variant is not explicitly listed in the FAA AD, the CASA AD’s applicability may not capture it. Conversely, the FAA AD may include explicit serial-number lists or configuration exclusions that determine whether a specific engine or disk is affected. Do not substitute a non-technical reading of "CF6-80" for the FAA AD’s precise lists.

7. Removal of CF6-80E1 series disks. The Background states that certain CF6-80E1 series disks are removed from service (Background). Operators using CF6-80E1 series engines must check the FAA AD to identify which disks are designated for removal, and plan for sourcing replacement parts and possible aircraft downtime.

8. The AD refers to an uncontained failure report as the reason for the AD. The Background says the AD "results from a recent report of an uncontained failure of a stage 1 HPT disk" and frames the inspections and rework as measures "to detect and prevent cracks in the bottoms of the dovetail slots" (Background). Practitioners should interpret the AD’s obligations in light of that hazard description, but the AD’s technical mitigation measures are located in the FAA AD.

9. Document formatting and repeats. The supplied text contains duplicated headings and lines (multiple repeats of "AD/CF6/62" and "High Pressure Turbine Disc" and "11/2006"). These duplicates appear to be formatting artefacts and do not change the substance of the AD’s Requirement, Applicability, Compliance, or Background entries. Rely on the substantive fields rather than repeated header lines.

10. The AD does not provide an explicit contact or service bulletin reference within its text. The AD does not list a service bulletin number or maintenance action owner in the supplied text; it points to the FAA AD for technical data. Practitioners must obtain FAA AD 2006-16-06 (Amdt 39-14706) for full operational detail.

1. Obtain FAA AD 2006-16-06, including Amendment 39-14706, and read it in full. The CASA AD’s Requirement is to take "Action per the technical requirements of FAA AD 2006-16-06" (Requirement). The specific inspections, rework procedures, part identification criteria, and compliance intervals are contained in that FAA AD. Compliance with the CASA AD requires strict adherence to the FAA AD’s technical provisions.

2. Determine applicability for each installed engine and disk. The CASA AD’s Applicability is limited to "General Electric Company (GE) CF6-80 model turbine engines as specified in FAA AD 2006-16-06" (Applicability). Operators must check the FAA AD’s lists and criteria to classify which engines and which stage 1 HPT rotor disks on those engines are affected. Identify whether each disk has previously undergone the inspections required by AD/CF6/54, because the CASA AD shortens the compliance schedule for disks not previously inspected under that earlier AD (Background).

3. Follow the inspection and rework regime described. The Background summarises that the AD continues initial inspections as qualification for mandatory rework for certain disks, allows repetitive inspections only for disks not requiring rework, requires rework before further flight for some disks, and removes certain CF6-80E1 series disks from service (Background). Operators must implement the inspection techniques, non-destructive testing, and rework methods described in FAA AD 2006-16-06, and schedule rework or removal as those procedures and the AD’s compliance times dictate.

4. Observe the effective date and schedule resources. The CASA AD records an effective date of 26 October 2006 (Compliance) and was issued on 13 September 2006. Plan manpower, dock time, spare parts procurement, and maintenance slot allocation to meet compliance intervals, especially where the CASA AD applies a shortened schedule to disks not previously inspected under AD/CF6/54 (Background).

5. Record prior compliance and document actions. Because the AD distinguishes disks previously inspected under AD/CF6/54 from those that have not been inspected, maintain clear maintenance records showing prior AD/CF6/54 inspection status, dates, procedures performed and any rework completed. Where FAA AD 2006-16-06 requires specific documentation, follow those record-keeping instructions.

6. Remove specified CF6-80E1 series disks from service where directed. The Background states that the previous AD "removes certain CF6-80E1 series disks from service" and that this AD requires the same actions with a shortened schedule for some disks (Background). Identify those CF6-80E1 disks in the FAA AD and plan for their removal and replacement, including sourcing approved replacement parts and ensuring any replacement meets continuing airworthiness standards.

7. Use appropriately authorised personnel and facilities. Although the CASA AD does not itself specify who may perform the inspections or rework, the technical complexity of HPT disk inspection and rework implies the need for qualified maintenance engineers and approved facilities. Comply with the competency and approval requirements set out by CASA and in the FAA AD or referenced service documents.

8. Check for related service bulletins and manufacturer instructions. The FAA AD typically references GE service bulletins and rework drawings. Obtain and follow any GE service documents that the FAA AD mandates as the method of compliance.

9. Monitor CASA communications for further amendments. The AD supersedes a prior AD and shortens compliance schedules; further changes may be issued. Keep CASA AD lists and advisories under review to ensure there are no later supersessions or refinements.

10. Prepare for operational impact. Inspections and rework, and removal of disks from service, will involve aircraft downtime and parts cost. The CASA AD makes this explicit by requiring rework before further flight for some disks and removal of certain disks (Background). Schedule aircraft availability, and, where necessary, notify operations planning and commercial teams of potential service interruptions to meet safety obligations.

Note: The CASA AD as supplied does not include a step-by-step compliance checklist, enforcement details, or penalty information. Compliance therefore requires reading FAA AD 2006-16-06 in full, documenting prior AD compliance history, and implementing the FAA AD’s technical requirements by the effective date set out in the CASA AD, 26 October 2006 (Requirement; Compliance; Background).