{"id":"F2006B03996","name":"AD/BEECH 55/50 Amdt 2 - Engine Mount Truss Tubes","slug":"ad-beech-55-50-amdt-2-engine-mount-truss-tubes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43605,"registerId":"commonwealth-F2006B03996-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/50 Amdt 2 - Engine Mount Truss Tubes","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 55/50\n\nAmdt 2\n\n\nEngine Mount Truss Tubes 10/78\n\n \n\nApplicability: All models 58P and 58PA with S/Nos. TJ-2 to TJ-117.\n\n \n\nAll models 58TC and 58TCA with S/Nos. TK-1 to TK-58. Requirement: Action in accordance with Beechcraft SI No. 0903, Rev. 11.\n\nNote: FAA AD No. 77-13-08 refers.\n\n \n\nCompliance: As per Requirement Document.\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":3,"scope_assessment":{"changed":true,"description":"The instrument is identified as Amendment 2 (Amdt 2), dated 10/78, which indicates it modifies a prior Airworthiness Directive (header). The text supplied does not state what aspect(s) were changed (for example, applicability, required actions, or the referenced service instruction). Therefore while the scope has been altered relative to an earlier version, this document alone does not specify the nature or extent of that change."},"complexity_factors":["Narrow applicability by specific models and serial numbers (Applicability) increases operational specificity but reduces general complexity.","Technical requirements are delegated to an external document (Beechcraft SI No. 0903, Rev. 11), requiring cross-referencing to implement (Requirement).","The AD text omits procedural detail (inspection steps, intervals, corrective actions, costs), so implementers must consult the referenced SI (Compliance).","Reference to an FAA AD indicates regulatory alignment across jurisdictions but adds an additional external document to check (Note).","Labelled as an amendment (Amdt 2) so historical comparison may be necessary to understand changes from prior versions (header)."],"plain_english_summary":"This AD requires operators of certain Beechcraft Baron aircraft (models 58P/58PA and 58TC/58TCA within the AD’s listed serial ranges) to carry out the inspections/modifications in Beechcraft Service Instruction No. 0903, Revision 11 for engine‑mount truss tubes. CASA enforces the AD; owners/operators bear costs, must obtain the SI for technical steps, and should note the AD aligns with FAA AD No. 77‑13‑08."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive originally issued in October 1978. The scope remains tightly focused on engine mount truss tube inspections for specific Beechcraft Baron variants. There is no evidence of scope creep; the amendment likely updates reference numbers or compliance details without expanding the aircraft population or safety issue addressed."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 defined applicability criteria (2 model types + serial number ranges)","Single requirement referencing external technical document (Beechcraft SI 0903 Rev 11)","No nested conditions, exceptions, or interpretive provisions","No cross-references to other legislation beyond a single FAA AD note","Straightforward compliance structure: 'do what the manufacturer says'"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific Beechcraft Baron aeroplanes to inspect or repair the **engine mount truss tubes** — the metal framework that holds the engine to the wing. The work must follow Beechcraft Service Instruction No. 0903, Revision 11.\n\n**Who it affects:** \n- **Beechcraft 58P and 58PA** models with serial numbers TJ-2 through TJ-117\n- **Beechcraft 58TC and 58TCA** models with serial numbers TK-1 through TK-58\n\nThese are pressurized and turbocharged variants of the twin-engine Baron aircraft.\n\n**Why it matters:** Engine mount failures are catastrophic — if the truss tubes crack or fail, the engine can separate from the aircraft in flight. This AD ensures critical structural inspections happen to prevent accidents.\n\n**Key details:**\n- **Compliance:** Follow the timeline in the referenced Beechcraft document\n- **Reference:** This aligns with FAA AD 77-13-08 (the US safety authority issued a similar order)\n- **Original issue:** October 1978 (indicated by \"10/78\")"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-50-amdt-2-engine-mount-truss-tubes","history":"/api/acts/ad-beech-55-50-amdt-2-engine-mount-truss-tubes/history","analysis":"/api/acts/ad-beech-55-50-amdt-2-engine-mount-truss-tubes/analysis","conflicts":"/api/acts/ad-beech-55-50-amdt-2-engine-mount-truss-tubes/conflicts","importantCases":"/api/acts/ad-beech-55-50-amdt-2-engine-mount-truss-tubes/important-cases","documents":"/api/acts/ad-beech-55-50-amdt-2-engine-mount-truss-tubes/documents"}}