{"id":"F2006B04876","name":"AD/CASA/2 - Engine Firewall Sealing","slug":"ad-casa-2-engine-firewall-sealing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44683,"registerId":"commonwealth-F2006B04876-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/2 - Engine Firewall Sealing","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)  Casa 212 Series Aeroplanes\n\n \n\nAD/CASA/2 Engine Firewall Sealing 12/82\n\nApplicability: Model 212 with S/Nos. as detailed in Casa SB No. 212-73-03, Rev. 1. Document:  Casa SB No. 212-73-03, Rev. 1.\n\nCompliance: If not already accomplished within 100 hours time in service after 31 December 1982. Background:               Manufacturer’s requirement to improve fireproofing at the engine firewall.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD enforces the manufacturer’s stated requirement to improve engine firewall fireproofing (Background) for the specific Model 212 serial numbers listed in the referenced service bulletin (Document). The directive implements that stated purpose by mandating the sealing modification within a fixed time window (Compliance). There is no indication in the AD text that the instrument expands, narrows or otherwise changes the manufacturer’s described objective; it requires the identified aircraft to comply with the service bulletin within the specified timeframe."},"complexity_factors":["Narrow, clearly defined applicability limited to Model 212 serial numbers listed in the referenced service bulletin (Applicability; Document).","Mandatory compliance with a single short deadline: within 100 hours time in service after 31 December 1982 (Compliance).","Technical details and exact modification steps are outsourced to the manufacturer’s service bulletin, so the AD itself is brief but relies on an external technical document (Document).","Implementation complexity is operational rather than legal: locating affected serial numbers, arranging maintenance, sourcing parts/materials, and recording compliance (Applicability; Document; Compliance).","Low regulatory discretion in the AD—action and timeframe are specified—reducing interpretive complexity but concentrating execution risk on operators (Compliance)."],"plain_english_summary":"This Airworthiness Directive mandates that owners/operators of the specified CASA 212 serial-numbered aeroplanes have the engine firewall sealed per the manufacturer's service bulletin (SB No. 212-73-03, Rev. 1) within 100 hours TIS after 31 Dec 1982. It requires maintenance work by qualified providers, imposes direct costs and downtime on operators, and aims to improve engine firewall fireproofing as specified by the manufacturer."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1982 addressing a specific technical defect. It has not expanded beyond its original purpose of mandating firewall sealing improvements on specific aircraft."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 operative provisions: applicability, reference document, compliance deadline, and background","No defined terms section","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Single condition (100 hours time in service after fixed date)","No nested exceptions or conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a safety fix for specific Casa 212 series aeroplanes (a type of aircraft).\n\n**What it does:**\n- Requires owners/operators of affected Casa 212 aircraft to improve the fireproof sealing at the engine firewall (the protective barrier between the engine and the rest of the aircraft that prevents fire from spreading).\n- The work must follow the manufacturer's instructions in **Casa Service Bulletin No. 212-73-03, Revision 1**.\n\n**Who it affects:**\n- Operators of Casa 212 model aircraft with specific serial numbers listed in that service bulletin.\n\n**When it had to be done:**\n- Within 100 hours of flight time after 31 December 1982 (if not already completed).\n\n**Why it matters:**\n- Engine fires in aircraft are extremely dangerous. This directive closes potential gaps in the firewall sealing to prevent fire from breaching the protective barrier and reaching the cabin or fuel systems, which could be catastrophic."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-2-engine-firewall-sealing","history":"/api/acts/ad-casa-2-engine-firewall-sealing/history","analysis":"/api/acts/ad-casa-2-engine-firewall-sealing/analysis","conflicts":"/api/acts/ad-casa-2-engine-firewall-sealing/conflicts","importantCases":"/api/acts/ad-casa-2-engine-firewall-sealing/important-cases","documents":"/api/acts/ad-casa-2-engine-firewall-sealing/documents"}}