{"id":"F2006B03706","name":"AD/BEECH 200/52 - Engine Mount Assembly Attachment Bolts","slug":"ad-beech-200-52-engine-mount-assembly-attachment-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43296,"registerId":"commonwealth-F2006B03706-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 200/52 - Engine Mount Assembly Attachment Bolts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBeechcraft 200 (Super King Air) Series Aeroplanes\n\nAD/BEECH 200/52 Engine Mount Assembly Attachment Bolts 10/92\n\nApplicability: Models and serial numbers as listed in Beech SB 2432.\n\nRequirement: 1. Individually remove each engine truss-to-firewall bolt and determine whether the bolt is manufactured by Dumont Aviation as specified by Figure 2 of, and in accordance with paragraphs 1 and 2 of the ACCOMPLISHMENT INSTRUCTIONS section of Beech SB 2432. Only one engine truss-to-firewall bolt shall be removed at any given time.\n\n2. Replace any bolt manufactured by Dumont Aviation as identified in Requirement 1 of this Directive with a new bolt part number MS20006-20 /M/.\n\nNote: FAA AD 92-15-01 Amdt 39-8294 refers.\n\nCompliance: 1. Within 150 hours time in service after 17 September 1992.\n\n2. Prior to further flight.\n\nBackground: This Directive requires a one-time visual inspection of all engine mount assembly attachment bolts to determine whether bolts that could have been improperly heat treated are installed, and replacement of any such bolts.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in a specific aircraft component. The scope remains precisely limited to inspection and replacement of potentially defective engine mount bolts on Beechcraft 200 series aircraft, exactly as intended."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined requirements with clear sequential steps","Single cross-reference to FAA AD 92-15-01 and Beech SB 2432","No nested exceptions or conditional logic","Clear, unambiguous compliance deadlines","Single applicability criterion (specific aircraft models/serials)","No interpretation section with defined terms"],"plain_english_summary":"This AD requires owners/operators of affected Beechcraft 200 (Super King Air) aircraft to inspect the engine-to-firewall mounting bolts for Dumont Aviation manufacture, removing only one bolt at a time, and to replace any Dumont bolts with part MS20006-20 per Beech Service Bulletin 2432. The inspection is required within 150 flight hours of 17 Sept 1992 and any defective bolts must be replaced before flight. It prevents possible engine-mount failure from improperly heat‑treated bolts."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains a one-time inspection and replacement requirement limited to engine truss-to-firewall bolts on the Beechcraft 200 series listed in Beech SB 2432. The directive does not expand beyond identification of Dumont-manufactured bolts and their mandatory replacement with part MS20006-20/M."},"complexity_factors":["Applicability depends on models/serial numbers listed externally in Beech SB 2432 (Applicability) — requires cross-reference to another document.","Action is a one-time, aircraft-level mechanical task: remove and inspect each engine truss-to-firewall bolt (Requirement 1) which is operationally simple but time-consuming.","Inspection requires identification of manufacturer per Figure 2 and paragraphs 1–2 of the Accomplishment Instructions in Beech SB 2432 (Requirement 1) — introduces reliance on SB guidance and visual ID criteria.","Mandatory replacement with specified part number MS20006-20 /M/ for any Dumont bolt (Requirement 2) creates a clear parts specification and procurement need.","Compliance timing: inspection within 150 hours time in service from 17 Sept 1992, and replacement required prior to further flight (Compliance) — imposes scheduling and urgent repair risk.","Safety-critical context (Background) means certified maintenance personnel must perform work and maintenance release considerations apply, raising labour and certification costs."],"plain_english_summary":"This airworthiness directive requires operators of certain Beechcraft 200 (Super King Air) aeroplanes (models/serials listed in Beech SB 2432) to remove and inspect each engine truss-to-firewall bolt to see if it was manufactured by Dumont Aviation, and to replace any Dumont bolt with part MS20006-20/M. Inspections must be done within 150 flight hours of 17 September 1992 and any identified Dumont bolt replaced before further flight. The measure responds to possible improper heat treatment of some bolts and creates inspection and replacement costs and aircraft downtime for operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-200-52-engine-mount-assembly-attachment-bolts","history":"/api/acts/ad-beech-200-52-engine-mount-assembly-attachment-bolts/history","analysis":"/api/acts/ad-beech-200-52-engine-mount-assembly-attachment-bolts/analysis","conflicts":"/api/acts/ad-beech-200-52-engine-mount-assembly-attachment-bolts/conflicts","importantCases":"/api/acts/ad-beech-200-52-engine-mount-assembly-attachment-bolts/important-cases","documents":"/api/acts/ad-beech-200-52-engine-mount-assembly-attachment-bolts/documents"}}