{"id":"F2006B03515","name":"AD/BAe 146/67 - Horizontal Stabiliser to Vertical Stabiliser Attachment Brackets","slug":"ad-bae-146-67-horizontal-stabiliser-to-vertical-stabiliser-attachment-brackets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43079,"registerId":"commonwealth-F2006B03515-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/67 - Horizontal Stabiliser to Vertical Stabiliser Attachment Brackets","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\n# AD/BAe 146/67  Horizontal Stabiliser to Vertical Stabiliser Attachment Brackets\n\nApplicability:   All series BAe 146 aircraft.\n\n \n\nAll Avro 146-RJ70 aircraft up to E1267. All Avro 146-RJ85 aircraft up to E2300. All Avro 146-RJ100 aircraft up to E3301.\n\n# 8/97\n\nRequirement: Inspect in accordance with British Aerospace Mandatory Service Bulletin 55-15.\n\n \n\nNote 1: UK CAA AD 001-04-97 refers.\n\n \n\nNote 2: Maintenance Review Board Report refers.\n\n \n\nCompliance: At the thresholds detailed in the requirement document.\n\n \n\nThis airworthiness directive becomes effective on 17 July 1997.\n\n \n\nBackground: Reports were received of corrosion on the inner faces of the horizontal stabiliser to vertical stabiliser attachment fitting, and on the adjoining vertical stabiliser lugs.\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":3,"scope_assessment":{"changed":false,"description":"Scope aligns with the directive's apparent original intent: all BAe 146 series aircraft are covered and must be inspected per the referenced service bulletin. The instrument adds a maintenance obligation but does not expand or narrow applicability beyond the stated fleets."},"complexity_factors":["Narrow technical focus: targets a specific attachment bracket and adjacent lugs (low breadth).","External reliance: mandates compliance with British Aerospace Mandatory Service Bulletin 55-15 rather than embedding procedural detail.","Variable implementation: thresholds and corrective actions are specified in the service bulletin, creating operational discretion for operators and maintenance providers.","Compliance enforcement: CASA oversight and effective date impose scheduling and recordkeeping burdens on operators.","Uncertain cost exposure: inspection frequency and potential repairs create variable direct costs and aircraft downtime."],"plain_english_summary":"This airworthiness directive requires all BAe 146 series aircraft to be inspected for corrosion at the horizontal‑to‑vertical stabiliser attachment brackets, in line with British Aerospace Mandatory Service Bulletin 55‑15. It became effective 17 July 1997.\n\nOwners and operators must schedule inspections and any necessary follow‑up work at the thresholds set in the service bulletin and bear the inspection, repair and downtime costs. The Civil Aviation Safety Authority enforces compliance; the directive changes routine maintenance obligations rather than introducing new design rules."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific structural inspection. It has not expanded beyond its original purpose of addressing corrosion in tail attachment brackets."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability ranges (aircraft series and serial numbers)","Single requirement referencing an external technical document (Service Bulletin 55-15)","No nested conditions or exceptions","No cross-references to other legislation beyond a note about a UK CAA AD","Straightforward compliance timing ('at thresholds detailed in requirement document')"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of the brackets that attach the horizontal tail to the vertical tail on BAe 146 and certain Avro RJ aircraft, following British Aerospace Mandatory Service Bulletin 55‑15. It targets all BAe 146s and Avro RJ70/RJ85/RJ100s up to specified serial-number limits after corrosion was found on bracket inner surfaces—requiring inspection and repair to prevent structural failure. Effective 17 July 1997."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-67-horizontal-stabiliser-to-vertical-stabiliser-attachment-brackets","history":"/api/acts/ad-bae-146-67-horizontal-stabiliser-to-vertical-stabiliser-attachment-brackets/history","analysis":"/api/acts/ad-bae-146-67-horizontal-stabiliser-to-vertical-stabiliser-attachment-brackets/analysis","conflicts":"/api/acts/ad-bae-146-67-horizontal-stabiliser-to-vertical-stabiliser-attachment-brackets/conflicts","importantCases":"/api/acts/ad-bae-146-67-horizontal-stabiliser-to-vertical-stabiliser-attachment-brackets/important-cases","documents":"/api/acts/ad-bae-146-67-horizontal-stabiliser-to-vertical-stabiliser-attachment-brackets/documents"}}