{"id":"F2006B09108","name":"AD/DHC-6/21 Amdt 1 - Elevator Connecting Rod - Inspection","slug":"ad-dhc-6-21-amdt-1-elevator-connecting-rod-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115661,"registerId":"commonwealth-F2006B09108-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-6/21 Amdt 1 - Elevator Connecting Rod - 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)  DHC-6 (Twin Otter) Series Aeroplanes\n\n \n\n# AD/DHC-6/21\n\nAmdt 1\n\nApplicability: All models.\n\n# Elevator Connecting Rod - Inspection 2/72\n\n \n\nRequirement:  Inspect all elevator connecting rods (irrespective of Batch No.) by means of the method detailed in De Havilland Aircraft of Canada SB No. 6/238 except those previously subjected to a detailed inspection.\n\n \n\nCompliance: Within 25 hours time in service after 14 February 1972.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1814},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This amendment maintains the original directive's narrow scope regarding elevator connecting rod inspections for all Twin Otter models. There is no expansion to additional aircraft systems, components, or applicability."},"complexity_factors":["Extremely brief (under 100 words of operative text)","Only one external reference (De Havilland SB 6/238)","Single conditional exception (previously inspected rods)","No definitions, interpretation section, or nested clauses"],"plain_english_summary":"**What this does**\nThis is a mandatory safety order (an Airworthiness Directive) for all DHC-6 Twin Otter aircraft. It requires a specific inspection of the **elevator connecting rods**—the mechanical linkages that connect the pilot's control column to the elevator on the tail—to ensure they are not defective or worn.\n\n**Who must comply**\nOwners and operators of all DHC-6 (Twin Otter) series aircraft.\n\n**What you must do**\n- Inspect every elevator connecting rod using the exact method described in *De Havilland Aircraft of Canada Service Bulletin No. 6/238*.\n- **Exception**: You do not need to inspect rods that have already been subjected to a \"detailed inspection\" (an intensive examination meeting aviation standards) prior to this directive.\n\n**When**\nWithin 25 hours of flight time after 14 February 1972.\n\n**Why it matters**\nDetecting cracks or wear in these critical control linkages prevents potential catastrophic failure of the aircraft's pitch controls."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-6-21-amdt-1-elevator-connecting-rod-inspection","history":"/api/acts/ad-dhc-6-21-amdt-1-elevator-connecting-rod-inspection/history","analysis":"/api/acts/ad-dhc-6-21-amdt-1-elevator-connecting-rod-inspection/analysis","conflicts":"/api/acts/ad-dhc-6-21-amdt-1-elevator-connecting-rod-inspection/conflicts","importantCases":"/api/acts/ad-dhc-6-21-amdt-1-elevator-connecting-rod-inspection/important-cases","documents":"/api/acts/ad-dhc-6-21-amdt-1-elevator-connecting-rod-inspection/documents"}}