{"id":"F2006B03997","name":"AD/BEECH 55/53 - Engine Firewall Elbow Fitting","slug":"ad-beech-55-53-engine-firewall-elbow-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43606,"registerId":"commonwealth-F2006B03997-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/53 - Engine Firewall Elbow Fitting","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 55, 58 and 95-55 (Baron) Series Aeroplanes\n\n \n\nAD/BEECH 55/53 Engine Firewall Elbow Fitting 4/78\n\nApplicability: Models 58P & 58PA with S/Nos. TJ-2 to TJ-122. Requirement:  Action in accordance with Beechcraft SI No. 0966. Compliance:               Within 100 hours’ time in service after 30 April 1978.\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":1973},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This 1978 directive remains tightly scoped to its original purpose: addressing a specific elbow fitting defect on a narrow range of Beechcraft 58P/PA aircraft. There is no indication of scope expansion into broader operational or maintenance requirements."},"complexity_factors":["Single, specific mechanical issue addressed","No defined terms or interpretation sections","Only one conditional element (serial number range)","External technical reference to Beechcraft Service Instruction No. 0966 for detailed procedures"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) requiring aircraft owners to fix a specific mechanical defect.\n\n**Who it affects:** Owners of specific **Beechcraft Baron** aeroplanes (models 58P and 58PA with serial numbers TJ-2 through TJ-122).\n\n**What must be done:** Inspect or replace the **engine firewall elbow fitting** (a pipe connector in the engine compartment wall) following the exact instructions in Beechcraft Service Instruction No. 0966.\n\n**Deadline:** Complete the work within **100 hours of flight time** after 30 April 1978.\n\n**Why it matters:** This prevents potential failure of the fitting that could compromise engine compartment integrity and flight safety. Flying without completing this directive renders the aircraft unairworthy and illegal to operate."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-53-engine-firewall-elbow-fitting","history":"/api/acts/ad-beech-55-53-engine-firewall-elbow-fitting/history","analysis":"/api/acts/ad-beech-55-53-engine-firewall-elbow-fitting/analysis","conflicts":"/api/acts/ad-beech-55-53-engine-firewall-elbow-fitting/conflicts","importantCases":"/api/acts/ad-beech-55-53-engine-firewall-elbow-fitting/important-cases","documents":"/api/acts/ad-beech-55-53-engine-firewall-elbow-fitting/documents"}}