{"id":"F2006B04644","name":"AD/BELL 412/1 - Engine Mount Fireshield - Installation","slug":"ad-bell-412-1-engine-mount-fireshield-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44396,"registerId":"commonwealth-F2006B04644-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 412/1 - Engine Mount Fireshield - Installation","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Bell Helicopter Textron 412 Series Helicopters\n\n \n\nAD/BELL 412/1 Engine Mount Fireshield - Installation 4/82\n\nApplicability: All models.\n\n \n\nRequirement: Install engine mount fireshield kit Bell Drwg. No. 412-961-021. Compliance:  Prior to issue of Certificate of Airworthiness.\n\nBackground: In order to reduce the effect of a single engine fire it is necessary to protect the engine mount with a fireshield. This will permit the other engine to remain aligned and to continue to deliver power to the rotor.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1896},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope. It addresses a specific safety modification (engine mount fire protection) for a specific aircraft type without expanding into broader operational requirements or unrelated systems."},"complexity_factors":["Single, unambiguous requirement with no sub-conditions","No defined terms, interpretation sections, or legislative cross-references","Extremely brief content (approximately 100 words of operative text)","Simple compliance trigger (prior to certificate issuance)","No exceptions, exemptions, or alternative compliance methods stated"],"plain_english_summary":"**What this is:** A mandatory safety directive (Airworthiness Directive) issued by the Civil Aviation Safety Authority for all Bell 412 series helicopters.\n\n**What it requires:** Install a protective fireshield kit around the engine mount, using the specific design identified as Bell Drawing No. 412-961-021.\n\n**Why it matters:** If one engine catches fire, the shield prevents heat damage to the engine mount. This ensures the other engine stays properly aligned and can keep delivering power to the rotor, allowing the pilot to maintain control and land safely rather than losing all power.\n\n**Who must comply:** Anyone applying for a Certificate of Airworthiness (the official document allowing a helicopter to fly) for a Bell 412 must install this kit before the certificate is issued."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-1-engine-mount-fireshield-installation","history":"/api/acts/ad-bell-412-1-engine-mount-fireshield-installation/history","analysis":"/api/acts/ad-bell-412-1-engine-mount-fireshield-installation/analysis","conflicts":"/api/acts/ad-bell-412-1-engine-mount-fireshield-installation/conflicts","importantCases":"/api/acts/ad-bell-412-1-engine-mount-fireshield-installation/important-cases","documents":"/api/acts/ad-bell-412-1-engine-mount-fireshield-installation/documents"}}