{"id":"F2006B09250","name":"AD/DHC-8/90 - Fuel Vent and Scavenge Line Fittings - Inspection","slug":"ad-dhc-8-90-fuel-vent-and-scavenge-line-fittings-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53188,"registerId":"commonwealth-F2006B09250-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/DHC-8/90 Fuel Vent and Scavenge Line ","sectionType":"part","heading":"AD/DHC-8/90 Fuel Vent and Scavenge Line Fittings - Inspection","content":"# AD/DHC-8/90 Fuel Vent and Scavenge Line Fittings - Inspection\n\n  \n1/2003","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive issued under the Civil Aviation Regulations 1998. It addresses a specific safety issue with a particular aircraft type and does not represent scope creep from original regulatory intent. ADs are designed to be narrow, targeted instruments."},"complexity_factors":["Short, single-purpose directive focused on one specific mechanical issue","Limited to one aircraft type series (DHC-8)","Standard AD structure with clear applicability, requirement, and compliance sections","No nested legislative cross-references beyond the enabling regulation (CAR 1998 subregulation 39.1(1))","Technical content refers to specific aircraft components but does not define them in the legislative text itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires aircraft owners and operators to take specific action to fix a known safety problem.\n\n**What it does:**\nThis AD applies to **Bombardier DHC-8 series aircraft** (also known as Dash 8 planes). It requires inspection of **fuel vent and scavenge line fittings** — these are parts of the aircraft's fuel system that allow air to escape from fuel tanks (vents) and return unused fuel to the tanks (scavenge lines).\n\n**Why it matters:**\nFaulty fittings in these fuel lines could create an **unsafe condition** — potentially fuel leaks, fire hazards, or engine fuel starvation. The directive mandates specific inspections to catch problems before they cause accidents.\n\n**Who must comply:**\n- Owners and operators of DHC-8 series aircraft\n- Maintenance organisations servicing these aircraft\n\n**What must be done:**\nThe directive requires inspections of the specified fuel system components, with compliance timing set out in the document (marked as 1/2003, likely indicating January 2003 or a reference date).\n\n**Key point:** Airworthiness Directives are legally binding. Non-compliance means the aircraft cannot be flown legally in Australian airspace."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Based on the supplied text, the AD's scope is to mandate inspection-related actions for fuel vent and scavenge line fittings on Bombardier DHC-8 series aeroplanes. The instrument text provided does not indicate any change in scope from that stated purpose; it sets an applicability (DHC-8 series), a regulatory basis (subregulation 39.1(1) CAR 1998), and refers to Requirement and Compliance sections for operative detail."},"complexity_factors":["Delegated regulatory authority under subregulation 39.1(1) CAR 1998 creates legal force but leaves substantive detail to Requirement and Compliance sections","Technical subject matter (fuel vent and scavenge line fittings) requires specialised maintenance knowledge to implement","The AD refers to separate sections (Requirement, Compliance, Applicability) for operative detail, requiring cross-referencing","Operational impacts (aircraft downtime, parts, labour) vary by operator and are not quantified in the AD text","Potential for procedural ambiguity if Requirement instructions lack technical specificity or rely on external service documents"],"plain_english_summary":"This Airworthiness Directive requires inspections and any corrective work on fuel vent and scavenge line fittings of Bombardier (De Havilland) DHC‑8 series aeroplanes to address an identified unsafe condition. It binds operators and maintenance organisations to comply on the CASA delegate’s timetable, placing inspection costs and scheduling burdens on aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-90-fuel-vent-and-scavenge-line-fittings-inspection","history":"/api/acts/ad-dhc-8-90-fuel-vent-and-scavenge-line-fittings-inspection/history","analysis":"/api/acts/ad-dhc-8-90-fuel-vent-and-scavenge-line-fittings-inspection/analysis","conflicts":"/api/acts/ad-dhc-8-90-fuel-vent-and-scavenge-line-fittings-inspection/conflicts","importantCases":"/api/acts/ad-dhc-8-90-fuel-vent-and-scavenge-line-fittings-inspection/important-cases","documents":"/api/acts/ad-dhc-8-90-fuel-vent-and-scavenge-line-fittings-inspection/documents"}}