{"id":"F2006B09094","name":"AD/DHC-3/8 - With Skin Riveting and Flap Hydraulic System","slug":"ad-dhc-3-8-with-skin-riveting-and-flap-hydraulic-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115647,"registerId":"commonwealth-F2006B09094-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/8 - With Skin Riveting and Flap Hydraulic System","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-3 (Otter) Series Aeroplanes\n\n \n\nAD/DHC-3/8 With Skin Riveting and Flap Hydraulic System NK\n\nApplicability: As detailed in Requirement Document.\n\n \n\nRequirement: Action in accordance with De H Canada EB “O” No 17 and 18.\n\n \n\nNote: Canadian AD 56-3 refers.\n\n \n\nCompliance: Forthwith.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting specific technical defects in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (under 150 words)","No defined terms section — relies entirely on external references","Single operative requirement: 'Action in accordance with' two external documents","No conditional logic, exceptions, or nested provisions","Cross-references to external technical documents (De Havilland Canada EB 'O' No 17 and 18, Canadian AD 56-3) but does not reproduce their content","Simple, imperative compliance timing ('Forthwith')"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for **De Havilland Canada DHC-3 Otter aircraft**.\n\n**What it does:**\n- Requires owners and operators of these specific aeroplanes to take immediate action regarding **skin riveting** (the metal fasteners holding the aircraft's outer skin together) and the **flap hydraulic system** (the hydraulic machinery that controls the wing flaps used during takeoff and landing).\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains DHC-3 Otter series aircraft in Australia.\n\n**What must be done:**\n- Follow the instructions in two specific De Havilland Canada Engineering Bulletins: **\"EB 'O' No 17\" and \"EB 'O' No 18\"** (these are technical service documents issued by the manufacturer).\n- The directive also references **Canadian AD 56-3** — meaning Australian operators must comply with a Canadian airworthiness directive as well.\n\n**When:**\n- **\"Forthwith\"** means immediately — there is no grace period.\n\n**Why it matters:**\n- This is a **mandatory safety order**. Non-compliance means the aircraft cannot legally fly. The issues with riveting and flap hydraulics likely pose serious risks to flight safety if not addressed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument itself does not indicate any amendment or expansion of scope relative to an earlier version; it sets applicability by reference to a Requirement Document and mandates actions in accordance with De Havilland Canada EB O No 17 and O No 18, to be complied with forthwith. There is no text in this instrument showing a change of scope from an original intent within the document supplied."},"complexity_factors":["Dependence on external technical documents (De Havilland Canada EB O No 17 and 18) rather than containing technical steps in the text (\"Requirement: Action in accordance with De H Canada EB \\u201cO\\u201d No 17 and 18\").","Applicability not stated directly in the instrument; it is delegated to a separate Requirement Document (\"Applicability: As detailed in Requirement Document\").","Immediate compliance timing (\"Forthwith\") which shortens implementation planning time and increases operational pressure.","Cross-reference to foreign regulatory action (Canadian AD 56-3), requiring parties to consult multiple jurisdictions for full context (\"Note: Canadian AD 56-3 refers\").","Minimal on-page detail about the specific work, inspections, or affected aircraft serials, increasing reliance on external materials for compliance."],"plain_english_summary":"This airworthiness directive imposes an immediate legal duty on the persons or entities named in the Requirement Document to carry out the actions set out in De Havilland Canada Engineering Bulletins O No 17 and O No 18 for certain DHC‑3 (Otter) aeroplanes.  \n\nIt delegates technical detail to those external bulletins (and references Canadian AD 56‑3), so affected operators must obtain and follow those documents to comply; costs and specific applicability are determined by the Requirement Document."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-8-with-skin-riveting-and-flap-hydraulic-system","history":"/api/acts/ad-dhc-3-8-with-skin-riveting-and-flap-hydraulic-system/history","analysis":"/api/acts/ad-dhc-3-8-with-skin-riveting-and-flap-hydraulic-system/analysis","conflicts":"/api/acts/ad-dhc-3-8-with-skin-riveting-and-flap-hydraulic-system/conflicts","importantCases":"/api/acts/ad-dhc-3-8-with-skin-riveting-and-flap-hydraulic-system/important-cases","documents":"/api/acts/ad-dhc-3-8-with-skin-riveting-and-flap-hydraulic-system/documents"}}