{"id":"F2006B02275","name":"AD/AL 250/64 Amdt 3 - Internal Energy Absorbing Ring","slug":"ad-al-250-64-amdt-3-internal-energy-absorbing-ring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41505,"registerId":"commonwealth-F2006B02275-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 250/64 Amdt 3 - Internal Energy Absorbing Ring","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 250/64\n\nAmdt 3\n\n  \nInternal Energy Absorbing Ring 12/89\n\nApplicability: Allison model 250-C30, C30L, C30M, C30P, C30S engines.\n\nRequirement: Install an internal energy absorbing ring in accordance with Allison CEB-A-72-3128 R1, Para 2 Accomplishment Instructions.\n\nNote: This Directive should be carried out in conjunction with CAO 106 AD/AL 250/66 Amdt 2. FAA AD 86-19-12 refers.\n\nCompliance: As detailed in Requirement document.\n\nBackground: This Directive has been amended to rationalize previous requirements, and to increase the engine models and aircraft applicable. The Requirements now require the subject internal energy absorbing ring to be installed in all C30 series engines. Previous references to airframe mounted, external containment shields and the Allison Assured Engine configuration have been deleted.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1537},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Expanded significantly from previous versions: previously applied only to specific configurations, but now mandates the internal ring for all C30 series engines. Also narrowed by removing permitted alternatives (external containment shields and Allison Assured Engine configurations), making the internal ring the sole compliance method."},"complexity_factors":["Single, specific mechanical requirement (install one component)","Short document with clear applicability limited to five specific engine models","Delegates technical details to external engineering document (Allison CEB-A-72-3128 R1)","No conditional compliance pathways, exceptions, or layered definitions","Compliance timing referenced externally rather than specified in the directive text"],"plain_english_summary":"This directive requires owners/operators of Allison 250‑C30 series engines (C30, C30L, C30M, C30P, C30S) to install an internal energy‑absorbing ring per Allison manual CEB‑A‑72‑3128 R1, ¶2. It broadens protection to all C30 engines, removes prior external containment or special‑configuration alternatives, and aligns with AD/AL 250/66 and FAA AD 86‑19‑12 to better contain debris after catastrophic failures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-250-64-amdt-3-internal-energy-absorbing-ring","history":"/api/acts/ad-al-250-64-amdt-3-internal-energy-absorbing-ring/history","analysis":"/api/acts/ad-al-250-64-amdt-3-internal-energy-absorbing-ring/analysis","conflicts":"/api/acts/ad-al-250-64-amdt-3-internal-energy-absorbing-ring/conflicts","importantCases":"/api/acts/ad-al-250-64-amdt-3-internal-energy-absorbing-ring/important-cases","documents":"/api/acts/ad-al-250-64-amdt-3-internal-energy-absorbing-ring/documents"}}