{"id":"F2006B02280","name":"AD/AL 250/69 - Installation of Internal Energy Absorbing Ring","slug":"ad-al-250-69-installation-of-internal-energy-absorbing-ring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41510,"registerId":"commonwealth-F2006B02280-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 250/69 - Installation of Internal Energy Absorbing Ring","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Allison Turbine Engines - 250 Series\n\n \n\nAD/AL 250/69 Installation of Internal Energy Absorbing Ring 2/86\n\nApplicability: 250-C28, -C28B and -C28C engines which do not incorporate internal energy absorbing ring P/N 23031865.\n\n \n\nRequirement: Allison C.E.B.-A-72-2126.\n\n \n\nCompliance: In accordance with the Requirement Document.\n\n \n\nBackground: This Directive is issued to ensure that debris from a no. 1 turbine wheel burst is contained thus precluding the possibility of secondary damage to the airframe.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1437},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope focused solely on the specific safety modification (installation of the energy absorbing ring) for the specified Allison engine models. There is no indication of scope creep or expansion beyond the original safety intent of preventing turbine burst debris damage."},"complexity_factors":["Extremely brief document with a single substantive requirement","No definitions section or interpretive provisions","Simple binary applicability test based on engine model and presence/absence of specific part number","Requirement incorporates external technical standard by direct reference without modification or conditional exceptions","No nested logic, temporal limitations, or exception clauses"],"plain_english_summary":"**What this is:** A mandatory safety instruction (Airworthiness Directive) issued by the Civil Aviation Safety Authority for owners of specific Allison 250 series turbine engines.\n\n**What it requires:** Installation of an internal \"energy absorbing ring\" (a protective metal component) inside certain engines that were manufactured without it.\n\n**Who it affects:** Owners and operators of Allison 250-C28, 250-C28B, or 250-C28C engines that do **not** already contain part number 23031865.\n\n**Why it matters:** This safety device acts like a protective cage around the engine's first turbine wheel. If that wheel fails and shatters, the ring catches the high-speed metal fragments to prevent them from shooting through the engine casing and destroying the aircraft body (\"airframe\"). Without this fix, a single engine component failure could destroy the entire aircraft and kill everyone on board.\n\n**How to comply:** Follow the technical instructions in the Allison service document referenced as C.E.B.-A-72-2126."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-250-69-installation-of-internal-energy-absorbing-ring","history":"/api/acts/ad-al-250-69-installation-of-internal-energy-absorbing-ring/history","analysis":"/api/acts/ad-al-250-69-installation-of-internal-energy-absorbing-ring/analysis","conflicts":"/api/acts/ad-al-250-69-installation-of-internal-energy-absorbing-ring/conflicts","importantCases":"/api/acts/ad-al-250-69-installation-of-internal-energy-absorbing-ring/important-cases","documents":"/api/acts/ad-al-250-69-installation-of-internal-energy-absorbing-ring/documents"}}