{"id":"F2006B03484","name":"AD/BAe 146/32 - Centre Section Fuel Tank Coating","slug":"ad-bae-146-32-centre-section-fuel-tank-coating","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43038,"registerId":"commonwealth-F2006B03484-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/32 - Centre Section Fuel Tank Coating","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)  British Aerospace BAe 146 Series Aeroplanes\n\n \n\nAD/BAe 146/32 Centre Section Fuel Tank Coating 7/91\n\nApplicability: Model 146 with series and constructors numbers listed in BAe 146 SB 28-18. Requirement:               Action in accordance with Mandatory BAe SB 28-18.\n\nCompliance: As specified in the Requirement document.\n\n \n\nBackground: Discrepancies have been found in the fuel proof polymer coating on the centre section fuel tank.\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\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The supplied AD sets applicability (Model 146 aircraft listed in BAe SB 28-18) and mandates action \"in accordance with\" Mandatory BAe SB 28-18. The text contains no indication that the scope was amended from an earlier version or that applicability or requirements have been expanded or narrowed beyond what is stated. Based on the provided material, there is no evidence that the AD’s scope differs from its original intent as presented here."},"complexity_factors":["Dependency on an external mandatory document (BAe SB 28-18) for the full technical requirements and timing","Applicability limited to specific series and constructor numbers listed in the external SB (requires cross-referencing)","Technical nature of the work (coating inspection/repair) which typically requires specialised labour, materials and possible aircraft downtime","AD text is short and prescriptive but omits procedural detail and schedule, increasing implementation uncertainty","Regulatory force under Part 39 (Schedule of Airworthiness Directives) means compliance is mandatory, reducing operator discretion"],"plain_english_summary":"This Airworthiness Directive from the Civil Aviation Safety Authority (under Commonwealth CAR Part 39) mandates that owners/operators of BAe 146 aeroplanes listed in Mandatory BAe Service Bulletin 28‑18 carry out the SB’s specified work to address discrepancies in the fuel‑proof polymer coating on the centre‑section fuel tank. Compliance is mandatory, costs and operational burden fall to affected owners/operators, and the AD relies on the SB for the exact actions and timing."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating fuel tank coating repairs."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies entirely on external reference to BAe SB 28-18","Single, unambiguous requirement: 'Action in accordance with Mandatory BAe SB 28-18'","No conditional logic, exceptions, or nested provisions","Simple structure: Applicability → Requirement → Compliance → Background","Cross-reference to only one external document (the Service Bulletin)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:** It requires owners and operators of specific **British Aerospace BAe 146 aircraft** to inspect and fix problems with the **fuel-proof coating inside the centre section fuel tank**. The coating is a protective polymer layer that prevents fuel from leaking or corroding the tank structure. Discrepancies (defects) were found in this coating, creating potential safety risks.\n\n**Who must act:** Anyone who owns or operates a BAe 146 model listed in British Aerospace Service Bulletin 28-18 (a technical notice from the manufacturer identifying affected aircraft by serial number).\n\n**What they must do:** Follow the exact instructions in **Mandatory Service Bulletin 28-18** — this details the inspection and repair procedures. The deadline for compliance is whatever date is specified in that bulletin.\n\n**Why it matters:** Fuel tank coating defects can lead to fuel leaks, corrosion, or in worst cases, fire or explosion. This AD ensures potentially dangerous aircraft are identified and fixed before they fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-32-centre-section-fuel-tank-coating","history":"/api/acts/ad-bae-146-32-centre-section-fuel-tank-coating/history","analysis":"/api/acts/ad-bae-146-32-centre-section-fuel-tank-coating/analysis","conflicts":"/api/acts/ad-bae-146-32-centre-section-fuel-tank-coating/conflicts","importantCases":"/api/acts/ad-bae-146-32-centre-section-fuel-tank-coating/important-cases","documents":"/api/acts/ad-bae-146-32-centre-section-fuel-tank-coating/documents"}}