{"id":"F2006B03400","name":"AD/B767/46 - Vertical Stabiliser","slug":"ad-b767-46-vertical-stabiliser","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42941,"registerId":"commonwealth-F2006B03400-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/46 - Vertical Stabiliser","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)  Boeing 767 Series Aeroplanes\n\n \n\nAD/B767/46 Vertical Stabiliser 12/90\n\nApplicability: Model 767 line numbers 002 through 299.\n\n \n\nRequirement: Action in accordance with Boeing Alert SB767-55A0007.\n\n \n\nNote: FAA AD 90-18-05 Amdt 39-6713 refers.\n\n \n\nCompliance: Unless previously accomplished, prior to 30 April 1992.\n\n \n\nBackground: Country of origin AD. To prevent overpressurization of the vertical stabilizer, which could cause structural failure. This could happen if rapid decompression of the fuselage occurred in the stabilizer area.\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":3,"scope_assessment":{"changed":false,"description":"The directive's scope is limited and specific: it applies to Model 767 aeroplanes with line numbers 002–299 and mandates the actions described in Boeing Alert SB767-55A0007 to prevent vertical stabiliser overpressurization (\"Applicability\", \"Requirement\", \"Background\"). There is no material in this document indicating a change from that stated purpose or from the originally described affected population."},"complexity_factors":["Narrow technical scope limited to Boeing 767 line numbers 002–299 (Applicability).","Directive delegates technical detail to an external manufacturer service document (Boeing Alert SB767-55A0007) rather than containing step-by-step instructions (Requirement).","Fixed compliance deadline increases operational scheduling pressure (Compliance).","Cross-reference to an FAA airworthiness directive implies coordination with country-of-origin requirements but requires operators to reconcile multiple sources (Note/Background).","The AD does not include enforcement or penalty detail within this text, leaving implementation and verification processes to regulatory practice (implicit in the document structure)."],"plain_english_summary":"This airworthiness directive legally requires operators of Boeing 767 aeroplanes (line numbers 002–299) to carry out the work specified in Boeing Alert SB767-55A0007 by 30 April 1992 if not already done. It aims to prevent overpressurisation and possible structural failure of the vertical stabiliser; compliance and associated costs, downtime and repairs are the responsibility of the affected owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1990 with a compliance deadline of April 1992. It addresses a specific technical defect in specific aircraft and has not expanded beyond its original narrow scope."},"complexity_factors":["Very short document (under 200 words)","Only one substantive requirement: comply with referenced Boeing Service Bulletin","Single applicability criterion (line numbers 002-299)","Single compliance deadline with straightforward exception ('unless previously accomplished')","No defined terms section — relies entirely on external technical references","No conditional logic, nested exceptions, or cross-references to other legislation beyond the Boeing bulletin and FAA AD"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of specific Boeing 767 aeroplanes to carry out a safety inspection or repair on the **vertical stabiliser** (the tall fin at the back of the plane).\n\n**Who it affects:**\nAnyone who owns or operates Boeing 767 aircraft with \"line numbers\" (manufacturing serial numbers) 002 through 299 — these are early production models.\n\n**Why it matters:**\nThere's a risk that if the fuselage rapidly decompresses (loses pressure suddenly) near the tail section, it could cause the vertical stabiliser to become over-pressurised and potentially fail structurally. This directive requires action to prevent that catastrophic failure.\n\n**What must be done:**\nOperators must follow the instructions in **Boeing Alert Service Bulletin 767-55A0007** — a technical document from the manufacturer detailing the required fix. This had to be completed before **30 April 1992** unless already done.\n\n**Key point:** This is a \"Country of origin AD\" — meaning Australia adopted this safety requirement from the United States Federal Aviation Administration (FAA AD 90-18-05), which first identified this defect."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-46-vertical-stabiliser","history":"/api/acts/ad-b767-46-vertical-stabiliser/history","analysis":"/api/acts/ad-b767-46-vertical-stabiliser/analysis","conflicts":"/api/acts/ad-b767-46-vertical-stabiliser/conflicts","importantCases":"/api/acts/ad-b767-46-vertical-stabiliser/important-cases","documents":"/api/acts/ad-b767-46-vertical-stabiliser/documents"}}