{"id":"F2006B09059","name":"AD/DHC-3/11 - Elevator Quadrant, Inboard Nose Flaps, Empennage, Aileron Centre Hinge and Flap Hydraulic System","slug":"ad-dhc-3-11-elevator-quadrant-inboard-nose-flaps-empennage-aileron-centre-hinge-and-flap-hydraulic-s","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52806,"registerId":"commonwealth-F2006B09059-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/11 - Elevator Quadrant, Inboard Nose Flaps, Empennage, Aileron Centre Hinge 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-3/11 Elevator Quadrant, Inboard Nose Flaps, Empennage, NK Aileron Centre Hinge and Flap Hydraulic System\n\nApplicability: As detailed in Requirement Document.\n\n \n\nRequirement: Action in accordance with De H Canada EB “O” Nos 22, 24, 28, 29, 30, 32, 33 and\n\n34.\n\n \n\nNote: Canadian AD 57-6 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 Airworthiness Directive with narrow, specific scope limited to particular aircraft components. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (Requirement Document)","No conditional logic or nested exceptions","Single compliance requirement: follow external technical documents (the Engineering Bulletins)","No cross-references to other legislation beyond a single note about Canadian AD 57-6","Straightforward command structure: applicability → requirement → compliance"],"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 carry out mandatory safety inspections and repairs on several critical components:\n  - **Elevator quadrant** (the control mechanism that moves the tail elevators)\n  - **Inboard nose flaps** (flaps at the front of the wings near the fuselage)\n  - **Empennage** (the entire tail section of the aircraft)\n  - **Aileron centre hinge** (the middle pivot point of the wing control surfaces that roll the aircraft)\n  - **Flap hydraulic system** (the hydraulic equipment that operates the wing flaps)\n\n**Who must comply:**\n- Anyone who owns or operates a DHC-3 Otter series aircraft in Australia.\n\n**What action is required:**\n- Follow the specific instructions in eight De Havilland Canada Engineering Bulletins (numbered 22, 24, 28, 29, 30, 32, 33 and 34). These bulletins contain the detailed technical procedures for inspections, repairs or replacements.\n\n**When:**\n- **Forthwith** — meaning immediately, without delay.\n\n**Why it matters:**\n- This directive addresses potential safety defects in flight-critical control systems. Non-compliance could lead to loss of aircraft control, endangering passengers, crew and people on the ground. It references a Canadian Airworthiness Directive (57-6), showing this is part of international safety coordination for this aircraft type."},"flash_summary":{"complexity_score":7,"scope_assessment":{"changed":false,"description":"The AD text requires actions in accordance with specified De Havilland Canada Engineering Bulletins and refers to a Requirement Document for applicability, and to Canadian AD 57-6. The directive itself does not state any explicit expansion or narrowing of scope compared with prior instruments; it sets mandatory compliance mechanics (external bulletins plus an applicability document) without indicating a change in scope within the text provided (Requirement; Applicability; Note)."},"complexity_factors":["Requirement relies on multiple external technical documents (De H Canada EB “O” Nos 22, 24, 28, 29, 30, 32, 33 and 34) rather than listing tasks directly (Requirement).","Applicability is not stated in the AD text but deferred to a separate Requirement Document, creating uncertainty about which aircraft/configurations are affected (Applicability).","Immediate compliance language (\"Forthwith\") compresses implementation timelines and increases operational and scheduling pressure (Compliance).","The AD covers multiple, distinct aircraft systems (elevator quadrant, inboard nose flaps, empennage, aileron centre hinge, flap hydraulic system) which may involve different trades, parts and inspection procedures (Title).","Cross-reference to a foreign jurisdiction’s AD (Canadian AD 57-6) introduces possible coordination or reconciliation tasks for operators working across regulatory regimes (Note).","Legal and practical responsibility is allocated to operators/owners but requires coordination with maintenance providers and regulators (Header; Requirement).","Potential administrative burden to obtain, interpret and document compliance with several referenced bulletins (Requirement; Applicability)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of affected DHC‑3 (Otter) aircraft to carry out immediate (“Forthwith”) inspections/repairs related to elevator quadrant, nose flaps, empennage, aileron hinge and flap hydraulics by complying with De Havilland Canada EB “O” Nos 22, 24, 28–30, 32–34. Applicability is set in a separate Requirement Document; operators bear the cost and scheduling impacts, and the AD cross‑references Canadian AD 57‑6 for related guidance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-11-elevator-quadrant-inboard-nose-flaps-empennage-aileron-centre-hinge-and-flap-hydraulic-s","history":"/api/acts/ad-dhc-3-11-elevator-quadrant-inboard-nose-flaps-empennage-aileron-centre-hinge-and-flap-hydraulic-s/history","analysis":"/api/acts/ad-dhc-3-11-elevator-quadrant-inboard-nose-flaps-empennage-aileron-centre-hinge-and-flap-hydraulic-s/analysis","conflicts":"/api/acts/ad-dhc-3-11-elevator-quadrant-inboard-nose-flaps-empennage-aileron-centre-hinge-and-flap-hydraulic-s/conflicts","importantCases":"/api/acts/ad-dhc-3-11-elevator-quadrant-inboard-nose-flaps-empennage-aileron-centre-hinge-and-flap-hydraulic-s/important-cases","documents":"/api/acts/ad-dhc-3-11-elevator-quadrant-inboard-nose-flaps-empennage-aileron-centre-hinge-and-flap-hydraulic-s/documents"}}