{"id":"F2006B09200","name":"AD/DHC-8/44 - Refuel/Defuel Tube Assembly","slug":"ad-dhc-8-44-refuel-defuel-tube-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53018,"registerId":"commonwealth-F2006B09200-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/44 - Refuel/Defuel Tube Assembly","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\nAD/DHC-8/44 Refuel/Defuel Tube Assembly 12/96\n\nDM\n\nApplicability: All DHC-8 model 102, 103, 106, 201 and 202 aircraft with serial number 203 through\n\n450 and model 311, 314 and 315 with serial number 202 through 451 fitted with P/N refuel/defuel tube assemblies as specified in the Requirement Document.\n\nRequirement: 1. Inspect the five applicable refuel/defuel tube assemblies in accordance with Section III, Part 1 of the Requirement Document.\n\nReplace any leaking tube assemblies before further flight with fuel tubes modified per Requirements 2 or 3 (as applicable).\n\n    2. Modify refuel/defuel assembly P/N 82820107-007 or 82821015-003, as applicable, in accordance with de Havilland modification 8/2589 as detailed in Section III, Part 2 of the Requirement Document.\n\n    3. Modify all remaining refuel/defuel tube assemblies in accordance with de Havilland modification 8/2589 as detailed in Section III, Part 3 of the Requirement Document.\n\nNote: Transport Canada AD CF-96-14 dated 20 August 1996 refers.\n\nCompliance: 1. Unless previously accomplished, initially within 30 days from 2 October 1996, and thereafter reinspect at intervals not exceeding 6 months from the last inspection.\n\n    2. No later than 2 October 1997.\n\n    3. No later than 2 October 1998.\n\nCompliance with Requirements 2 and 3 are terminating action for Requirement 1.\n\nBackground: The manufacturer advised that an operator has reported a fuel leakage from the refuel/defuel line shroud drain that is located near the refuel/defuel adapter in the R/H nacelle. Fuel leakage can collect beneath the exhaust fingernail on the heat shield structure and because of the heat generated in the area, is a potential fire hazard.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft models. It remains focused on its original purpose of mitigating fuel leak fire hazards in DHC-8 aircraft."},"complexity_factors":["Multiple applicability criteria (aircraft models, serial number ranges, and specific part numbers)","Three distinct requirements with different compliance deadlines and interdependencies","Cross-reference to external Requirement Document (Section III, Parts 1-3) and Canadian authority (Transport Canada AD CF-96-14)","Conditional logic: Requirement 1 terminates upon compliance with Requirements 2 and 3","Technical aviation terminology requiring specialized knowledge (P/N, nacelle, modification numbers)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Bombardier DHC‑8 (Dash 8) aircraft with certain refuel/defuel tube assemblies to inspect for and repair fuel leaks and to carry out a manufacturer modification that eliminates the defect. It mandates recurring leak checks until the modification is installed, addressing reported fuel drainage near hot engine parts that could cause a fire."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive is narrowly focused on inspecting and modifying specified refuel/defuel tube assemblies to address a reported fuel leak/fire hazard. It does not expand beyond that technical, serial‑numbered population or introduce broader regulatory obligations."},"complexity_factors":["Narrow technical scope: targets specific refuel/defuel tube assemblies on enumerated DHC‑8 models and serial number ranges.","Multiple identified part numbers and a referenced manufacturer modification (de Havilland mod 8/2589) increase technical specificity and parts dependency.","Phased compliance: initial inspection within 30 days, repeating every 6 months, and separate deadlines for two modification phases (no later than 2 Oct 1997 and 2 Oct 1998).","Safety-critical enforcement: leaking assemblies must be replaced before further flight, creating immediate operational constraints.","Terminology and workmanship dependence on an external Requirement Document — inspectors and maintainers must follow that document for correct procedures.","Cross-reference to foreign AD (Transport Canada CF-96-14) adds regulatory alignment considerations.","Compliance costs and operational downtime fall to aircraft owners/operators (inspections, possible replacements, and modifications).","Administrative tracking: operators must manage recurring inspections and demonstrate completion of terminating actions for ongoing compliance."],"plain_english_summary":"This airworthiness directive requires operators of certain Bombardier/De Havilland DHC‑8 aeroplanes to inspect refuel/defuel tube assemblies and to replace or modify any leaking units to a prescribed design. It sets initial and recurring inspection intervals and phased deadlines for modification. Operators of the listed serial‑numbered models must fund and carry out the work according to the manufacturer's Requirement Document; the stated aim is to eliminate a reported fuel‑leak near an exhaust that creates a fire risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-44-refuel-defuel-tube-assembly","history":"/api/acts/ad-dhc-8-44-refuel-defuel-tube-assembly/history","analysis":"/api/acts/ad-dhc-8-44-refuel-defuel-tube-assembly/analysis","conflicts":"/api/acts/ad-dhc-8-44-refuel-defuel-tube-assembly/conflicts","importantCases":"/api/acts/ad-dhc-8-44-refuel-defuel-tube-assembly/important-cases","documents":"/api/acts/ad-dhc-8-44-refuel-defuel-tube-assembly/documents"}}