{"id":"F2006B04019","name":"AD/BEECH 55/74 - Engine Mounts","slug":"ad-beech-55-74-engine-mounts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43628,"registerId":"commonwealth-F2006B04019-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/74 - Engine Mounts","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 55/74 Engine Mounts 11/91\n\nApplicability:  Models 95-C55, 95-C55A, D55, D55A, E55, and E55A with serial numbers TC350, and TE-1 through TE-1201. Models 58 and 58A with serial numbers TH-1 through TH-1610.\n\n \n\nRequirement:  Action in accordance with the Technical Requirements of FAA AD 91-15-20 Amdt 39-7084.\n\n \n\nNote: Beech SB 2362 Revision 1 refers.\n\n \n\nCompliance: As specified in the Requirement Document with a revised effective date of 14 November 1991, for Australian registered aircraft.\n\n \n\nBackground: The FAA has received reports of cracked engine mounts on the affected aircraft. This Directive requires periodic inspections for cracks in the engine mounts.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a narrow, specific purpose (inspecting engine mounts on particular aircraft). It has not expanded beyond its original scope; it does exactly what it says on the tin and references external technical standards rather than growing new regulatory obligations."},"complexity_factors":["Extremely short document — approximately 150 words of substantive content","Only 2 defined applicability criteria (aircraft models and serial numbers)","Single operational requirement that defers entirely to external FAA document (AD 91-15-20)","No nested conditions, exceptions, or procedural subsections","No cross-references to other Australian legislation beyond parenthetical mention of Civil Aviation Regulations 1998, Part 39","Linear structure: Applicability → Requirement → Note → Compliance → Background"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific Beechcraft Baron aircraft.\n\n**Who it affects:** Owners and operators of particular Beechcraft Baron models (95-C55, 95-C55A, D55, D55A, E55, E55A, 58, and 58A) with specific serial numbers — roughly covering aircraft built from the 1960s through early 1980s.\n\n**What it requires:** Aircraft owners must follow the technical instructions from an American Federal Aviation Administration (FAA) safety directive (AD 91-15-20). This means conducting **periodic inspections to check for cracks in the engine mounts** — the metal structures that hold the engines to the wings.\n\n**Why it matters:** Cracked engine mounts are serious. If they fail, an engine could detach from the aircraft in flight. The FAA discovered this problem through incident reports, and Australia adopted the same safety requirement to protect local aircraft.\n\n**Key points:**\n- **Compliance deadline:** 14 November 1991 (for Australian-registered aircraft)\n- **Reference document:** Beechcraft Service Bulletin 2362 Revision 1 provides additional guidance\n- **Nature of the rule:** This is a \"follow-the-FAA\" directive — Australia is importing an existing American safety standard rather than creating its own unique requirement"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive adopts the FAA AD requirements for the listed models/serial numbers and mandates periodic inspections for engine‑mount cracks; the text gives no indication that the scope was expanded beyond those FAA requirements for Australian registered aircraft (Requirement; Compliance)."},"complexity_factors":["Cross‑reference to external FAA AD for technical detail rather than reproducing inspection procedures (Requirement).","Applicability limited to specified models and serial numbers, requiring operators to check serial lists.","Reference to a specific manufacturer service bulletin (Beech SB 2362 Rev 1) for supplementary guidance.","Compliance keyed to a revised effective date for Australian‑registered aircraft (Compliance), creating a jurisdictional implementation detail.","Operational burden: periodic inspections create recurring maintenance scheduling and cost obligations for operators.","Enforcement and recordkeeping responsibilities rest with operators/maintenance organisations and CASA as the authority (header: Civil Aviation Safety Authority)."],"plain_english_summary":"This airworthiness directive requires operators of specified Beechcraft 55, 58 and 95‑55 series aeroplanes (particular serial numbers listed) to perform periodic inspections of engine mounts for cracks, following the technical requirements of FAA AD 91‑15‑20 and Beech SB 2362 Rev 1. It applies to Australian‑registered aircraft; operators and their maintenance organisations must carry out and pay for the inspections and comply with CASA’s revised effective date (14 Nov 1991). The rule mechanically imposes inspection and compliance obligations to detect mount cracking."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-74-engine-mounts","history":"/api/acts/ad-beech-55-74-engine-mounts/history","analysis":"/api/acts/ad-beech-55-74-engine-mounts/analysis","conflicts":"/api/acts/ad-beech-55-74-engine-mounts/conflicts","importantCases":"/api/acts/ad-beech-55-74-engine-mounts/important-cases","documents":"/api/acts/ad-beech-55-74-engine-mounts/documents"}}