{"id":"F2006B04844","name":"AD/CAP 10/1 - Engine Mount Welds","slug":"ad-cap-10-1-engine-mount-welds","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44651,"registerId":"commonwealth-F2006B04844-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CAP 10/1 - Engine Mount Welds","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)  Avions Mudry Cap Series Aeroplanes\n\n \n\nAD/CAP 10/1 Engine Mount Welds 13/90\n\nApplicability: All CAP 10B models.\n\n \n\nRequirement: Perform a dye penetrant inspection of the engine mount top welds, as shown in Avions Mudry Service Bulletin No 4, dated 17 November 1977, in accordance with the procedures specified in CAO 108.10, Issue 1, dated 1 September 1971.\n\n \n\nCompliance: Prior to exceeding 1000 hours total time in service, and thereafter at intervals not to exceed 100 hours time in service.\n\n \n\nBackground: There have been several reported instances of fatigue cracks propagating from the welds at the top of the engine mount.\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\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":false,"description":"The directive applies to all CAP 10B models and mandates periodic dye‑penetrant inspections of the engine‑mount top welds with a specified initial and recurring interval (Applicability; Requirement; Compliance). The text contains no indication that the scope has been altered from its stated content."},"complexity_factors":["Narrow applicability limited to all CAP 10B models (Applicability) — lowers scope complexity.","Single, specific inspection method mandated (dye penetrant) with cross‑reference to Avions Mudry Service Bulletin No 4 (Requirement) — technical but prescriptive.","Cross‑reference to an external procedural standard (CAO 108.10, Issue 1, 1971) increases administrative steps to obtain and follow the correct procedure (Requirement).","Recurring compliance interval (initial <1,000 hours TIS; then every 100 hours TIS) creates ongoing operational scheduling and record‑keeping requirements (Compliance).","Directive is part of the Civil Aviation Safety Authority Schedule of Airworthiness Directives (Part 39) — administratively enforceable, but the text gives little operational discretion (header; Requirement)."],"plain_english_summary":"Owners/operators of Avions Mudry CAP 10B aeroplanes must carry out dye‑penetrant inspections of the engine‑mount top welds—using Avions Mudry Service Bulletin No 4 and CAO 108.10—first before 1,000 hours TIS and thereafter every 100 hours. \n\nThe measure targets CAP 10Bs to detect fatigue cracks early; operators must fund and document inspections and any repairs, increasing recurring maintenance, downtime, and demand for NDT service providers."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness concern (engine mount weld fatigue) in a specific aircraft model. It has not expanded beyond its original purpose of mandating inspections to prevent structural failure."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability criterion (CAP 10B models)","Single, clear compliance requirement with specific time trigger (1000 hours TIS, then 100-hour intervals)","References only 2 external documents (Service Bulletin No. 4 and CAO 108.10) with specific dates/versions","No nested exceptions, conditional logic, or alternative compliance methods","Straightforward imperative language ('Perform', 'in accordance with')"],"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). It requires owners and operators of specific French-made aerobatic aircraft to inspect the engine mount for dangerous cracks.\n\n**Who it affects:** Anyone who owns or operates a **CAP 10B model aeroplane** made by Avions Mudry (a French manufacturer). These are two-seat aerobatic training aircraft popular in flying clubs.\n\n**What you must do:**\n- **Before the plane hits 1,000 total flying hours:** Inspect the welded joints at the top of the engine mount using a \"dye penetrant\" test (a special chemical process that makes hairline cracks visible).\n- **After that:** Repeat this inspection every 100 flying hours.\n- **How to do it:** Follow the exact method described in the manufacturer's Service Bulletin No. 4 (dated 1977) and use the inspection procedures in CAO 108.10 (a Civil Aviation Order from 1971).\n\n**Why it matters:** Fatigue cracks have been found in these welds. If a crack goes undetected, the engine could literally fall off the aircraft in flight. This directive prevents catastrophic failure by catching cracks early.\n\n**The bottom line:** If you fly or maintain a CAP 10B, you cannot skip this inspection. It's legally binding and essential for safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cap-10-1-engine-mount-welds","history":"/api/acts/ad-cap-10-1-engine-mount-welds/history","analysis":"/api/acts/ad-cap-10-1-engine-mount-welds/analysis","conflicts":"/api/acts/ad-cap-10-1-engine-mount-welds/conflicts","importantCases":"/api/acts/ad-cap-10-1-engine-mount-welds/important-cases","documents":"/api/acts/ad-cap-10-1-engine-mount-welds/documents"}}