{"id":"F2010L02683","name":"AD/CF6/78 - State of Design Airworthiness Directives","slug":"ad-cf6-78-state-of-design-airworthiness-directives","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84639,"registerId":"commonwealth-F2010L02683-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"General Electric Turbine Engines - CF6 S","sectionType":"division","heading":"General Electric Turbine Engines - CF6 Series","content":"### General Electric Turbine Engines - CF6 Series\n\n| AD/CF6/78 | State of Design Airworthiness Directives | 21/2010 |\n| --------- | ---------------------------------------- | ------- |\n\n```html\n

Applicability:

General Electric CF6 engines.

Requirement:

Determine the applicability of the United States Federal Aviation Administration (FAA) Airworthiness Directives (ADs) listed in Table 1.

If it is determined that an FAA AD listed in Table 1 is applicable and has not been previously accomplished, perform the actions required by that AD.

Service Bulletins approved by the FAA as Alternative Methods of Compliance (AMOC) to the FAA ADs listed in the Table 1 are considered acceptable for compliance with the equivalent requirements of this Directive.

TABLE 1

FAA AD

Effective Date

Title

90-12-06

25/06/1990

Low Pressure Turbine

96-16-07

28/08/1996

Rear Right Hand Mount Link

2005-26-06

26/01/2006

Low Pressure Turbine (LPT) stage 2 interstage seal assemblies

2007-21-06

15/11/2007

Electronic Control Unit (ECU)

Note 1: FAA ADs may be accessed via the internet at the following URL: http://rgl.faa.gov

Compliance:

If a certificate of airworthiness has not been issued for the aircraft - before issue of the certificate of airworthiness.

If a certificate of airworthiness has been issued for the aircraft - before further flight after 8 November 2010.

This Airworthiness Directive becomes effective on 8 November 2010.

\n```\n\n| Background: | The FAA ADs listed in Table 1 of this Directive require once-only actions for which the compliance date has passed. CASA has determined that these ADs may be applicable when an aircraft enters the Australian register. This Directive is issued to ensure compliance with all State of Design ADs. CASA appreciates that, due to date of aircraft manufacture or aircraft configuration and modification status, some of the ADs listed in Table 1 may not be applicable to aircraft registered in Australia. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)\n\nMike Higgins \nDelegate of the Civil Aviation Safety Authority\n\n8 October 2010","sortOrder":0},{"sectionNumber":"AD/CF6/78","sectionType":"part","heading":"AD/CF6/78","content":"## AD/CF6/78","sortOrder":1},{"sectionNumber":"State of Design Airworthiness Directives","sectionType":"part","heading":"State of Design Airworthiness Directives","content":"## State of Design Airworthiness Directives","sortOrder":2},{"sectionNumber":"21/2010","sectionType":"part","heading":"21/2010","content":"## 21/2010","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"CASA extended the practical reach of the FAA 'State of Design' ADs by requiring that listed once‑only AD actions be checked and, if applicable, completed for CF6‑powered aircraft entering the Australian register even though the FAA compliance dates have passed. The instrument therefore applies retrospectively to newly registered or imported aircraft, while acknowledging some listed ADs may not apply depending on an aircraft's manufacture or configuration."},"complexity_factors":["Cross-reference to multiple FAA ADs with differing effective dates","Retrospective compliance requirement where original FAA compliance dates have passed","Need for operators to determine applicability based on aircraft manufacture, configuration and modification status","Acceptance of FAA‑approved service bulletins as AMOCs requires checking FAA approvals","Timing constraints tied to certificate issuance and a fixed 'before further flight' deadline","Administrative recordkeeping and potential physical work to meet one‑off AD requirements"],"plain_english_summary":"Mechanically: owners/operators of aircraft fitted with General Electric CF6 engines must check the FAA Airworthiness Directives listed in Table 1 and, where an FAA AD applies and has not already been complied with, perform the required one‑off actions before a certificate of airworthiness is issued or before further flight after 8 November 2010. FAA‑approved service bulletins are accepted as alternative methods of compliance. This directive targets aircraft entering the Australian register and places the verification and compliance costs and administrative burden on owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original scope as a State of Design Airworthiness Directive. It performs the standard function of adopting foreign (FAA) safety requirements for Australian-registered aircraft, which is the intended purpose of this regulatory instrument type. The scope has not expanded beyond ensuring compliance with the four specified FAA ADs for CF6 engines."},"complexity_factors":["Short, single-purpose directive with clear applicability statement","Only 4 external references (the FAA ADs in Table 1)","Simple conditional logic: check applicability → if applicable → perform action","Two straightforward compliance pathways based on aircraft registration status","Single alternative compliance mechanism (AMOC via Service Bulletins)","No defined terms section or complex interpretation provisions","No nested exceptions or cross-references to other Australian legislation"],"plain_english_summary":"Owners and operators of aircraft with General Electric CF6 engines on the Australian register must check whether four specified FAA airworthiness directives apply to their engines and, if so, carry out the required fixes (or use FAA‑approved service bulletins as alternatives). \n\nNew-to‑Australia aircraft must comply before a certificate of airworthiness is issued; existing aircraft must comply before flying after 8 November 2010. This aligns Australia with FAA safety actions addressing turbine, mount, seal and ECU risks."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-78-state-of-design-airworthiness-directives","history":"/api/acts/ad-cf6-78-state-of-design-airworthiness-directives/history","analysis":"/api/acts/ad-cf6-78-state-of-design-airworthiness-directives/analysis","conflicts":"/api/acts/ad-cf6-78-state-of-design-airworthiness-directives/conflicts","importantCases":"/api/acts/ad-cf6-78-state-of-design-airworthiness-directives/important-cases","documents":"/api/acts/ad-cf6-78-state-of-design-airworthiness-directives/documents"}}