{"id":"F2006B03995","name":"AD/BEECH 55/49 - Engine Mount Fitting Attach Bolts","slug":"ad-beech-55-49-engine-mount-fitting-attach-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43604,"registerId":"commonwealth-F2006B03995-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/49 - Engine Mount Fitting Attach Bolts","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 55/49 Engine Mount Fitting Attach Bolts 3/77\n\nApplicability: All models 58P and 58PA with S/Nos. TJ-46 to TJ-74, TJ-76, TJ-78 to TJ-80, TJ-82 to TJ-85, TJ-88 and TJ-89.\n\n \n\nAll models 58TC and 58TCA with S/Nos. TK-7 to TK-18, TK-20, TK-21, TK-25, TK-27, TK-30, TK-32, TK-34, TK-37 and TK-38.\n\n \n\nRequirement: Action in accordance with Beechcraft SI No. 0875-038. Compliance:  Within 100 hours’ time in service after 31 March 1977.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"N/A — this is a discrete, single-issue airworthiness directive from 1977 with no evidence of scope creep. It addresses one specific mechanical defect in specific aircraft serial numbers."},"complexity_factors":["Single, specific technical requirement referencing an external manufacturer document","Limited applicability — only 4 specific aircraft models with enumerated serial numbers","Simple compliance deadline (100 hours time-in-service after fixed date)","No defined terms section, no cross-references to other legislation, no conditional exceptions","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific owners of certain Beechcraft Baron aeroplanes to inspect or replace engine mount bolts.\n\n**Who it affects:**\n- Owners and operators of specific Beechcraft Baron models: 58P, 58PA, 58TC, and 58TCA\n- Only applies to aircraft with specific serial numbers listed in the directive\n\n**What it requires:**\n- Follow the instructions in Beechcraft Service Instruction No. 0875-038 (a manufacturer document detailing the fix)\n- Complete the work within 100 hours of flying time after 31 March 1977\n\n**Why it matters:**\nEngine mount bolts hold the engine to the airframe. If these bolts fail, the engine could detach in flight — a catastrophic safety risk. This directive forces affected aircraft owners to address a known defect before the bolts reach a dangerous condition."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text sets a clear, limited scope: it applies to specific Beechcraft 58-series models and serial-number groups and requires the actions in Beechcraft SI No. 0875-038 to be completed within the stated timeframe. There is no information in the text indicating any change from an earlier or different scope; therefore there is no evidence here that the scope has changed from the original intent as expressed in this directive."},"complexity_factors":["Narrow technical scope focused on a single component (engine mount fitting attach bolts).","Applicability limited to specific models and detailed serial-number ranges, requiring cross-checking aircraft records.","Mandatory compliance by reference to an external document (Beechcraft SI No. 0875-038) whose content is not reproduced in the directive.","Short, fixed compliance window (100 hours’ time in service after a specific date) that operators must track.","Low regulatory discretion in the directive text (it prescribes the manufacturer’s Service Instruction as the required action)."],"plain_english_summary":"Owners/operators of specific Beechcraft 58-series aircraft (listed by serial number) must carry out the work in Beechcraft Service Instruction No. 0875-038 addressing engine‑mount fitting attach bolts within 100 hours’ time in service after 31 March 1977. The rule delegates the technical remedy to the manufacturer’s SI, imposes downtime and costs on aircraft owners, and aims to address a safety/airworthiness concern with those engine‑mount bolts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-49-engine-mount-fitting-attach-bolts","history":"/api/acts/ad-beech-55-49-engine-mount-fitting-attach-bolts/history","analysis":"/api/acts/ad-beech-55-49-engine-mount-fitting-attach-bolts/analysis","conflicts":"/api/acts/ad-beech-55-49-engine-mount-fitting-attach-bolts/conflicts","importantCases":"/api/acts/ad-beech-55-49-engine-mount-fitting-attach-bolts/important-cases","documents":"/api/acts/ad-beech-55-49-engine-mount-fitting-attach-bolts/documents"}}