{"id":"F2006B02259","name":"AD/AL 250/48 Amdt 3 - Fourth Stage Turbine Nozzle P/N 6898694 - Inspection","slug":"ad-al-250-48-amdt-3-fourth-stage-turbine-nozzle-p-n-6898694-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41489,"registerId":"commonwealth-F2006B02259-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 250/48 Amdt 3 - Fourth Stage Turbine Nozzle P/N 6898694 - Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAllison Turbine Engines \\- 250 Series\n\nAD/AL 250/48\n\nAmdt 3\n\n  \n\nFourth Stage Turbine Nozzle P/N 6898694 - Inspection\n\n  \n5/83\n\nApplicability: Allison 250-C30, C30P and C30S engines and turbine assemblies as detailed in the requirement document.\n\nDocument: Allison 250-C30, C30P, C30S : CEB-A-72-3056, Rev. 3.\n\nNote: As FAA Airworthiness Directive No. 81-13-12 refers in part only. Compliance to this level does not constitute full compliance with Amendment 3 of this Directive.\n\nCompliance: In accordance with the requirement document upon receipt of this Directive. Background: This Directive was initially issued as the result of the receipt of FAA Directive No.\n\n81-13-12. It is raised in issue to promulgate the changes made in Revision 3 of CEB-\n\nA-72.3056 which includes wider model affectivity, additional inspections and adds parts life limitations.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The instrument extends the original scope. As stated in the Background, Revision 3 of the referenced requirement document widens the range of affected engine models, adds additional inspections and introduces parts life limitations. The Applicability and Background together indicate the Amendment increases model affectivity and the set of mandated maintenance actions compared with the earlier issue."},"complexity_factors":["Relies on an external technical requirement document (CEB-A-72-3056 Rev. 3) for operative detail rather than containing technical requirements itself (Document; Compliance).","Cross-reference to a prior FAA AD while explicitly stating that compliance with that FAA AD alone is not sufficient, creating potential for interpretive confusion (Note).","Amendment introduces expanded model affectivity, additional inspections and parts life limitations, which increases operational and recordkeeping complexity for operators (Background).","The AD requires compliance 'upon receipt' but provides no phased implementation details or transitional provisions in the text provided (Compliance).","Limited procedural detail in the AD itself means implementers must access and interpret the separate requirement document to determine exact tasks and intervals (Document)."],"plain_english_summary":"This Airworthiness Directive applies to Allison 250‑C30, C30P and C30S engines/turbine assemblies and legally requires immediate compliance with the technical requirements of CEB‑A‑72‑3056, Revision 3. Revision 3 widens affected models and adds inspections and parts‑life limits, so operators must update maintenance and records and comply upon receipt; the earlier FAA AD alone may not suffice."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive has expanded beyond its original scope. Initially issued in response to a specific FAA directive (81-13-12), Amendment 3 now covers 'wider model affectivity' (more engine variants), adds 'additional inspections,' and introduces 'parts life limitations' — representing a significant broadening from the original inspection-only mandate."},"complexity_factors":["Short, single-purpose directive (approximately 150 words)","Only 1 defined term implicitly referenced (the part number P/N 6898694)","Simple conditional structure: applicability → document reference → compliance requirement","No nested exceptions or complex cross-referencing to other legislation","Refers to external technical document (CEB-A-72-3056 Rev. 3) but does not reproduce its contents","Single amendment track (Amendment 3) with clear background explanation"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on aircraft engines.\n\n**What it does:** It orders owners and operators of certain **Allison 250-C30 series turbine engines** to inspect the **fourth stage turbine nozzle** (part number 6898694) according to a specific technical document (CEB-A-72-3056, Revision 3).\n\n**Who it affects:** Anyone operating or maintaining Allison 250-C30, C30P, or C30S engines — commonly used in helicopters and light aircraft.\n\n**Why it matters:** The directive was triggered by a US Federal Aviation Administration (FAA) safety alert about potential problems with these engine parts. The Australian version has been updated (Amendment 3) to:\n- Cover more engine models than originally specified\n- Add extra inspection requirements\n- Impose **life limits** on certain parts (meaning parts must be replaced after a set number of flight hours or cycles, regardless of condition)\n\n**Key warning:** Simply following the US FAA directive (81-13-12) is **not enough** — operators must comply with this specific Australian Amendment 3 to meet legal requirements.\n\n**When to comply:** Immediately upon receiving this directive — there's no grace period."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-250-48-amdt-3-fourth-stage-turbine-nozzle-p-n-6898694-inspection","history":"/api/acts/ad-al-250-48-amdt-3-fourth-stage-turbine-nozzle-p-n-6898694-inspection/history","analysis":"/api/acts/ad-al-250-48-amdt-3-fourth-stage-turbine-nozzle-p-n-6898694-inspection/analysis","conflicts":"/api/acts/ad-al-250-48-amdt-3-fourth-stage-turbine-nozzle-p-n-6898694-inspection/conflicts","importantCases":"/api/acts/ad-al-250-48-amdt-3-fourth-stage-turbine-nozzle-p-n-6898694-inspection/important-cases","documents":"/api/acts/ad-al-250-48-amdt-3-fourth-stage-turbine-nozzle-p-n-6898694-inspection/documents"}}