{"id":"F2006B03950","name":"AD/BEECH 50/26 - Nacelle Interior Fire Seal","slug":"ad-beech-50-26-nacelle-interior-fire-seal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43559,"registerId":"commonwealth-F2006B03950-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 50/26 - Nacelle Interior Fire Seal","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)  Beechcraft 50 (Twin Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 50/26 Nacelle Interior Fire Seal 2/74\n\nApplicability: Model E50 with S/Nos. EH-1 to EH-70.\n\nModel F50 with S/Nos. FH-71 to FH-96 except FH-94; Model G50 with S/Nos. GH-94, GH-97 to GH-119; Model H50 with S/Nos. HH-120 to HH-149;\n\nModel J50 with S/Nos. JH-150 and on.\n\n \n\nRequirement: Install Beech Nacelle Interior Fire Seal Kits P/N 65-9008-1. Compliance:  Within 100 hours’ time in service after 30 September 1974.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on fire seal installation for one aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 substantive requirements: install specific part number, comply by specific deadline","Clear applicability section listing exact aircraft models and serial numbers","No defined terms section","No cross-references to other legislation or regulations","Single compliance action with straightforward time-in-service calculation","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Beechcraft 50 series aircraft (known as \"Twin Bonanzas\") to install fire-resistant seals inside the engine nacelles (the housings around the engines).\n\n**Who it affects:**\n- Owners and operators of specific Beechcraft 50 models with particular serial numbers, including models E50, F50, G50, H50, and J50 manufactured between certain serial number ranges.\n\n**What it requires:**\n- Install a specific fire seal kit (Beech part number 65-9008-1) inside the engine nacelles.\n- This must be done within 100 hours of flight time after 30 September 1974.\n\n**Why it matters:**\n- Engine fires in aircraft are extremely dangerous. These fire seals help contain any fire within the nacelle and prevent it from spreading to other parts of the aircraft, protecting passengers and crew. This directive was issued to address a known safety risk in these specific aircraft models."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope, as presented, is to require installation of a specific nacelle interior fire seal kit on the listed Beechcraft 50 serial-numbered aircraft within a defined time window. The supplied text does not show any expansion or narrowing beyond that stated scope; it targets specific serial numbers, prescribes a single part number, and sets a single compliance deadline (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability limited to specific models and serial numbers (Applicability).","Single, clearly specified mandated action: install P/N 65-9008-1 (Requirement).","Firm compliance deadline expressed in service hours after a calendar date, which is straightforward to calculate but requires accurate time-in-service records (Compliance).","Specification of a single part number channels procurement and verification, reducing ambiguity but potentially creating dependence on that part (Requirement).","Absence in the supplied text of alternate compliance methods, installation details or authorised equivalence increases practical questions for maintenance planning (Requirement)."],"plain_english_summary":"This AD mandates installation of Beech nacelle interior fire‑seal kit P/N 65‑9008‑1 on specified Beechcraft 50 (Twin Bonanza) serial numbers, to be fitted within 100 hours’ time‑in‑service after 30 Sep 1974. It obliges owners/operators and maintenance providers to procure, install and record the kit, creating short‑term maintenance scheduling, cost and potential parts‑supply impacts for the listed aircraft while simplifying inspection verification by specifying a single part and deadline."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-50-26-nacelle-interior-fire-seal","history":"/api/acts/ad-beech-50-26-nacelle-interior-fire-seal/history","analysis":"/api/acts/ad-beech-50-26-nacelle-interior-fire-seal/analysis","conflicts":"/api/acts/ad-beech-50-26-nacelle-interior-fire-seal/conflicts","importantCases":"/api/acts/ad-beech-50-26-nacelle-interior-fire-seal/important-cases","documents":"/api/acts/ad-beech-50-26-nacelle-interior-fire-seal/documents"}}