{"id":"F2006B09000","name":"AD/DHC-1/16 - Tailwheel Yoke Attachment Bolt - Inspection","slug":"ad-dhc-1-16-tailwheel-yoke-attachment-bolt-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52646,"registerId":"commonwealth-F2006B09000-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/16 - Tailwheel Yoke Attachment Bolt - Inspection","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)  De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n \n\nAD/DHC-1/16 Tailwheel Yoke Attachment Bolt - Inspection 11/66\n\nApplicability: All models incorporating Mod. H.223. Document:  Hawker Siddeley TNS Series ST(C1) No. 152.\n\nCompliance: At intervals not exceeding 300 hours time in service.\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\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1541},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope as a specific mechanical inspection requirement targeting a single attachment bolt on defined aircraft configurations."},"complexity_factors":["Single operative clause (one inspection requirement)","No interpretation section or defined legal terms","No cross-references to other legislative provisions","Simple temporal trigger (300 hours time in service) with no exceptions or conditional logic","Limited applicability criteria (single aircraft type and modification reference)"],"plain_english_summary":"**What this is:** A mandatory safety rule for owners of vintage De Havilland DHC-1 Chipmunk aircraft (a British-designed trainer plane from the 1940s-50s).\n\n**What it requires:** If your aircraft has Modification H.223 installed, you must regularly inspect the **tailwheel yoke attachment bolt** — the bolt that holds the tailwheel assembly to the airframe. This inspection must happen **every 300 hours of flight time** (time in service).\n\n**Who it affects:** Operators and maintainers of DHC-1 Chipmunk aeroplanes fitted with Mod. H.223. You can check your aircraft's maintenance records to see if this modification applies.\n\n**Why it matters:** The tailwheel is a critical control surface for ground handling. A failed attachment bolt could cause loss of directional control during takeoff or landing. This rule ensures potential cracks or wear are caught before they cause failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-16-tailwheel-yoke-attachment-bolt-inspection","history":"/api/acts/ad-dhc-1-16-tailwheel-yoke-attachment-bolt-inspection/history","analysis":"/api/acts/ad-dhc-1-16-tailwheel-yoke-attachment-bolt-inspection/analysis","conflicts":"/api/acts/ad-dhc-1-16-tailwheel-yoke-attachment-bolt-inspection/conflicts","importantCases":"/api/acts/ad-dhc-1-16-tailwheel-yoke-attachment-bolt-inspection/important-cases","documents":"/api/acts/ad-dhc-1-16-tailwheel-yoke-attachment-bolt-inspection/documents"}}