{"id":"F2006B06962","name":"AD/SF340/33 - Inner Wing Fuel Tanks","slug":"ad-sf340-33-inner-wing-fuel-tanks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114862,"registerId":"commonwealth-F2006B06962-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/33 - Inner Wing Fuel Tanks","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)  SAAB SF340 Series Aeroplanes\n\n \n\nAD/SF340/33 Inner Wing Fuel Tanks 5/92\n\nApplicability: Model 340B S/N 160 through 226 inclusive.\n\n \n\nRequirement: Action in accordance with SAAB Service Bulletin 340-28-013. Note 1: Swedish Airworthiness Directive (SAD) No 1-046 refers. Note 2: FAA AD 92-03-10 Amdt 3908165 refers.\n\nCompliance: Within 250 hours time in service from 20 April 1992 or by 31 July 1992, whichever occurs first.\n\n \n\nBackground: During pressure refuelling, a piece of foam blocked the vent line between the inner and outer fuel cell. This blockage caused a pressure build up which deformed the ribs and wing skin.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating a fuel tank inspection/repair."},"complexity_factors":["Very short document (under 200 words of substantive content)","Only 1 defined applicability criterion (specific serial number range)","Single compliance action with clear deadline","No nested conditions or exceptions","No cross-references to other legislation — only references to technical service bulletins and foreign ADs for background context","Straightforward temporal compliance formula ('whichever occurs first')"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific **Saab 340B aircraft** (serial numbers 160 to 226) to carry out a safety inspection or repair on their **inner wing fuel tanks**. The work must follow instructions in **Saab Service Bulletin 340-28-013**.\n\n**Why it matters:** A piece of foam blocked a fuel vent line during refuelling, causing pressure to build up. This pressure damaged the wing's internal ribs and outer skin — a serious structural risk. The directive prevents this dangerous scenario from recurring.\n\n**Who must act:** Anyone operating the affected Saab 340B aircraft in Australia.\n\n**When by:** The earlier of either **250 flight hours** after 20 April 1992, or **31 July 1992**.\n\n**Key references:**\n- Swedish Airworthiness Directive SAD No 1-046 (the original Swedish safety order)\n- FAA AD 92-03-10 (the equivalent US safety order)"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD is narrowly targeted to Model 340B aircraft S/N 160–226 and requires action to remedy a specific vent-line blockage and resulting deformation identified in the Background. The directive's scope, as written in the supplied text, aligns with that stated purpose and does not expand or alter the affected population or the problem addressed."},"complexity_factors":["Narrow applicability (specific model and serial-number range).","Requirement delegates technical details to an external manufacturer service bulletin (SAAB Service Bulletin 340-28-013).","Cross-references to foreign airworthiness directives (SAD and FAA AD) require coordination or awareness of parallel documents.","Short compliance window (250 flight hours or a calendar date) concentrates scheduling burden.","Technical aviation maintenance work (fuel-tank venting and structural inspection/repair) requires certified maintenance resources."],"plain_english_summary":"The Civil Aviation Safety Authority mandates that SAAB 340B aircraft (serials 160–226) undergo the inspection/repair in Saab Service Bulletin 340-28-013 to address a fuel‑tank vent blockage that can deform wing structure. Operators must complete the work within 250 flight hours from 20 April 1992 or by 31 July 1992, whichever is sooner, and are responsible for arranging and paying for the mandated corrective action."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-33-inner-wing-fuel-tanks","history":"/api/acts/ad-sf340-33-inner-wing-fuel-tanks/history","analysis":"/api/acts/ad-sf340-33-inner-wing-fuel-tanks/analysis","conflicts":"/api/acts/ad-sf340-33-inner-wing-fuel-tanks/conflicts","importantCases":"/api/acts/ad-sf340-33-inner-wing-fuel-tanks/important-cases","documents":"/api/acts/ad-sf340-33-inner-wing-fuel-tanks/documents"}}