{"id":"F2006B02795","name":"AD/B727/90 - Ground Spoiler Hydraulic Tube Assemblies - Modification","slug":"ad-b727-90-ground-spoiler-hydraulic-tube-assemblies-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42137,"registerId":"commonwealth-F2006B02795-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/90 - Ground Spoiler Hydraulic Tube Assemblies - Modification","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 727 Series Aeroplanes\n\n \n\n# AD/B727/90 Ground Spoiler Hydraulic Tube Assemblies - Modification\n\nApplicability: All models 727 with line numbers 1 to 1612. Document:  1. FAA AD 82-10-03 Amdt. 39-4375; or\n\n2. Boeing SB No. 727-27-202, Rev. 1.\n\n \n\nCompliance: As per requirement document.\n\n# 7/82\n\n \n\nBackground: Three overseas operators have reported inadvertently cross connecting a ground spoiler up-line with a ground spoiler-down line during routine maintenance.\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 instrument’s scope is limited to Boeing 727 aeroplanes with line numbers 1–1612 and requires modification of ground spoiler hydraulic tube assemblies by reference to specified FAA/Boeing documents. The text provides no indication that the scope was altered from any earlier intent; it addresses a specific maintenance error reported by three operators and mandates compliance with the referenced requirement documents. (See \"Applicability\", \"Document\", \"Compliance\", \"Background\".)"},"complexity_factors":["Targeted scope: applies only to Boeing 727s line numbers 1–1612 (narrow applicability reduces complexity). (Applicability)","External dependence: the AD requires following external documents (FAA AD 82-10-03 Amdt. 39-4375 or Boeing SB 727-27-202 Rev.1), so technical details are not in the AD itself. (Document, Compliance)","Operational specificity: the issue concerns hydraulic tube routing and maintenance practices, which require technical maintenance work (complexity sits in the referenced technical documents). (Background, Document)","Regulatory formality: the AD creates a mandatory compliance obligation without listing steps, timelines or costs—operators must consult other documents, adding an administrative step. (Compliance)","Implementation variance: actual labour, parts and downtime depend on each operator’s maintenance program and the content of the referenced documents (creates variable practical complexity). (Compliance)"],"plain_english_summary":"This AD requires operators of Boeing 727s (line nos. 1–1612) to modify ground‑spoiler hydraulic tube assemblies by following the procedures in the referenced FAA AD or Boeing service bulletin. It was issued after reports of inadvertent up‑line/down‑line connections during maintenance. Operators must carry out and pay for the mandated work to maintain airworthiness; the AD imposes the legal obligation while the referenced documents set technical detail and timing."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific maintenance error risk on a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined term implicitly referenced (line numbers)","No nested conditional logic or exceptions","Single compliance pathway: follow the referenced FAA AD or Boeing Service Bulletin","No cross-references to other Australian legislation beyond the enabling Civil Aviation Regulations 1998","Straightforward applicability statement (all models 727, line numbers 1-1612)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **all Boeing 727 aircraft** (specifically those with line numbers 1 through 1612).\n\n**What it does:**\nThe directive requires a **modification to the ground spoiler hydraulic tube assemblies**. Ground spoilers are panels on the wings that pop up on landing to help slow the plane down. The hydraulic tubes are the pipes that carry fluid to move these panels.\n\n**Why it matters:**\nThree overseas airlines reported that maintenance crews had accidentally **cross-connected the \"up\" and \"down\" hydraulic lines** during routine maintenance. This means the spoilers could deploy when they should retract, or vice versa — a potentially dangerous situation during takeoff or landing.\n\n**What must happen:**\nAircraft operators must follow the modification instructions in either:\n- **FAA Airworthiness Directive 82-10-03** (the US equivalent), or\n- **Boeing Service Bulletin 727-27-202, Revision 1**\n\n**Compliance:**\nOperators must complete the modification as specified in those documents. The directive itself doesn't set a new deadline — it simply makes compliance with the referenced documents mandatory under Australian law."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-90-ground-spoiler-hydraulic-tube-assemblies-modification","history":"/api/acts/ad-b727-90-ground-spoiler-hydraulic-tube-assemblies-modification/history","analysis":"/api/acts/ad-b727-90-ground-spoiler-hydraulic-tube-assemblies-modification/analysis","conflicts":"/api/acts/ad-b727-90-ground-spoiler-hydraulic-tube-assemblies-modification/conflicts","importantCases":"/api/acts/ad-b727-90-ground-spoiler-hydraulic-tube-assemblies-modification/important-cases","documents":"/api/acts/ad-b727-90-ground-spoiler-hydraulic-tube-assemblies-modification/documents"}}