{"id":"F2009L00890","name":"AD/DHC-8/145 - Wing Fuel Tank Skin between Yw171 and Yw 261","slug":"ad-dhc-8-145-wing-fuel-tank-skin-between-yw171-and-yw-261","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78198,"registerId":"commonwealth-F2009L00890-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Boeing Canada/De Havilland) ","sectionType":"division","heading":"Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","content":"### Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\n| AD/DHC-8/145 | Wing Fuel Tank Skin betweenYw171 and Yw 261 | 4/2009 |\n| ------------ | ------------------------------------------- | ------ |\n\n| Applicability: | DHC-8 aircraft, Models 102, 103, 106, 201, and 202, with serial numbers 003 through 663.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of Transport Canada AD CF-2009-05.Note: Bombardier Service Bulletin 8-57-46 original issue, or later Transport Canada approved revision, refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of9 April 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 9 April 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| Background:    | During a puncture voltage test of the aluminium-loaded paint on an in-service DHC-8 aircraft, conducted to validate an SFAR 88 related task, the manufacturer discovered that the top wing fuel tank skin between Yw171.20 and Yw261.00 was painted with a non-aluminised enamel coating due to a misinterpretation of the painting instructions in the Structural Repair Manual. With this type of paint application, it is possible that, in the worst case scenario, a lightning strike could puncture the wing skin and create an ignition source in the fuel tank. This Directive requires certain actions to ensure that the correct paint type is applied to the affected wing skin. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n24 February 2009","sortOrder":0},{"sectionNumber":"AD/DHC-8/145","sectionType":"part","heading":"AD/DHC-8/145","content":"## AD/DHC-8/145","sortOrder":1},{"sectionNumber":"Wing Fuel Tank Skin betweenYw171 and Yw ","sectionType":"part","heading":"Wing Fuel Tank Skin betweenYw171 and Yw 261","content":"## Wing Fuel Tank Skin between  \nYw171 and Yw 261","sortOrder":2},{"sectionNumber":"4/2009","sectionType":"part","heading":"4/2009","content":"## 4/2009","sortOrder":3}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope is not altered from the directive's stated purpose: it targets the same models, serial-number range and wing area and requires adherence to the referenced Transport Canada AD and Bombardier service bulletin. The only procedural change noted is a revised effective date (9 April 2009); no expansion or narrowing of applicability or corrective measures is specified in the supplied text."},"complexity_factors":["Cross-reference dependency on Transport Canada AD CF-2009-05 and Bombardier Service Bulletin 8-57-46 (operators must obtain and follow external technical documents).","Technical specificity of affected area (wing skin between Yw171.20 and Yw261.00) requiring precise structural knowledge and access to aircraft drawings.","Limited applicability by model and serial-number range (Models 102,103,106,201,202; S/N 003–663) which requires fleet-level record checks.","Compliance action involves materials/airworthiness work (inspection, paint removal and reapplication) imposing direct maintenance costs and downtime on operators.","Regulatory certainty but little operator discretion: directive mandates compliance actions and an effective date (revised to 9 April 2009)."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier DHC-8 Models 102, 103, 106, 201 and 202 (serial numbers 003–663) to follow Transport Canada AD CF-2009-05 and Bombardier Service Bulletin 8-57-46 to inspect and, if necessary, remove and replace non-aluminised paint on the wing fuel-tank skin between Yw171.20 and Yw261.00. CASA says the change corrects a misapplied enamel coating that could allow a lightning strike to puncture the tank; aircraft owners/operators bear the inspection and repair costs and must comply by 9 April 2009."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific manufacturing defect in a defined aircraft population. It has not expanded beyond the original safety issue identified — the incorrect paint application on the wing fuel tank skin between specific structural stations."},"complexity_factors":["Very short document (approximately 250 words of substantive content)","Only 1 defined term implicitly referenced (Yw station numbers — aircraft measurement points)","Single compliance pathway: follow the Canadian AD and service bulletin","No nested exceptions or conditional logic — applies to all listed serial numbers or none","No cross-references to other Australian legislation; delegates entirely to Canadian regulatory document","Clear, singular requirement with specific effective date"],"plain_english_summary":"This AD requires operators of certain Bombardier DHC‑8 (Dash 8) aircraft to inspect and, if needed, recoat a wing skin area above the fuel tank that was painted with the wrong, non‑aluminium paint. Following Transport Canada AD CF‑2009‑05 and Bombardier’s service instructions fixes a lightning‑protection gap that could allow lightning to breach the skin and ignite fuel — a catastrophic fire/explosion risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-145-wing-fuel-tank-skin-between-yw171-and-yw-261","history":"/api/acts/ad-dhc-8-145-wing-fuel-tank-skin-between-yw171-and-yw-261/history","analysis":"/api/acts/ad-dhc-8-145-wing-fuel-tank-skin-between-yw171-and-yw-261/analysis","conflicts":"/api/acts/ad-dhc-8-145-wing-fuel-tank-skin-between-yw171-and-yw-261/conflicts","importantCases":"/api/acts/ad-dhc-8-145-wing-fuel-tank-skin-between-yw171-and-yw-261/important-cases","documents":"/api/acts/ad-dhc-8-145-wing-fuel-tank-skin-between-yw171-and-yw-261/documents"}}