{"id":"F2006B07587","name":"AD/VIPER/5 - Exhaust Cone Assembly","slug":"ad-viper-5-exhaust-cone-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50226,"registerId":"commonwealth-F2006B07587-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VIPER/5 - Exhaust Cone Assembly","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)  Rolls Royce Turbine Engines - Viper Series\n\n \n\nAD/VIPER/5 Exhaust Cone Assembly 3/90\n\nApplicability: Viper Mk, 520, 521, 522 engines.\n\n \n\nRequirement: 1. Action accordance with Rolls Royce Service Bulletin No. 72-A338, or\n\n \n\n2. CAO 106 AD/RRT-V/16. Compliance: Effective 22 March 1990.\n\nBackground: This Directive has been reissued to maintain the requirements of AD/RRT-V/16. The requirement follows an incident where the exhaust inner cone was lost due to detachment of a cap nut and stay pin.\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\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":2059},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument maintains its original scope as a targeted safety directive addressing a specific mechanical failure mode (exhaust cone detachment) in identified engine models. It is a reissue of a previous directive to preserve existing airworthiness requirements without expansion."},"complexity_factors":["Extremely short instrument (under 150 words)","Single operational requirement with two alternative compliance paths","Reference to external technical standard (Rolls Royce Service Bulletin) requiring specialist engineering knowledge to interpret","No definitions section or interpretive provisions","Simple applicability limited to three specific engine models"],"plain_english_summary":"**What this is:** An aviation safety rule (called an Airworthiness Directive) that mandates urgent maintenance on specific jet engines to prevent parts falling off during flight.\n\n**Who it affects:** Owners and operators of aircraft fitted with Rolls Royce Viper Mk 520, 521, or 522 turbine engines.\n\n**What it requires:** You must inspect and repair the exhaust cone assembly (the metal cone at the back of the engine that directs hot exhaust gases) according to the technical instructions in **Rolls Royce Service Bulletin No. 72-A338**. Alternatively, you can comply with an earlier safety rule referenced as **CAO 106 AD/RRT-V/16**.\n\n**Why it matters:** An exhaust cone detached from an engine in flight because a cap nut and stay pin worked loose. This creates a serious risk of engine damage or debris striking the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-viper-5-exhaust-cone-assembly","history":"/api/acts/ad-viper-5-exhaust-cone-assembly/history","analysis":"/api/acts/ad-viper-5-exhaust-cone-assembly/analysis","conflicts":"/api/acts/ad-viper-5-exhaust-cone-assembly/conflicts","importantCases":"/api/acts/ad-viper-5-exhaust-cone-assembly/important-cases","documents":"/api/acts/ad-viper-5-exhaust-cone-assembly/documents"}}