{"id":"F2006B10433","name":"AD/HS 125/152 - Hydraulic Pipes","slug":"ad-hs-125-152-hydraulic-pipes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116129,"registerId":"commonwealth-F2006B10433-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/152 - Hydraulic Pipes","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 125 Series Aeroplanes\n\n \n\nAD/HS 125/152 Hydraulic Pipes 7/95\n\nApplicability: All BAe 125 series 1000A, 1000B and Hawker 1000 aircraft.\n\n \n\nRequirement: Action in accordance with Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB.29-95.\n\n \n\nNote: This SB has been classified as Mandatory by the UK CAA.\n\n \n\nCompliance: By 31 June 1995.\n\n \n\nBackground: The manufacturer has advised that chafing between the equipment bay structure and hydraulic lines has been reported.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive with a narrow, specific purpose. It has not expanded beyond its original intent of addressing a specific hydraulic pipe chafing issue in specific aircraft models."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — all language is plain technical English","Single, unambiguous requirement: comply with an external service bulletin","No nested conditions, exceptions, or cross-references to other legislation","Simple applicability test (specific aircraft models listed by name)","Single compliance deadline with no alternative methods or phased implementation"],"plain_english_summary":"**What 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:** Requires owners and operators of specific British Aerospace jets (the BAe 125 series 1000A, 1000B, and Hawker 1000 models) to inspect and fix a specific mechanical problem. The problem is that hydraulic pipes in the equipment bay are rubbing against the aircraft structure (\"chafing\"), which could damage the pipes and potentially cause hydraulic system failure.\n\n**Who must act:** Anyone who owns or operates the affected aircraft types in Australia.\n\n**What they must do:** Follow the instructions in a technical bulletin called \"SB.29-95\" issued by the manufacturer (Hawker Raytheon Corporate Jets). This bulletin has already been classified as mandatory by the UK aviation regulator.\n\n**When:** The work had to be completed by 31 June 1995 (note: this appears to be a typographical error, as June only has 30 days — likely intended to mean 30 June 1995).\n\n**Why it matters:** Hydraulic systems control critical aircraft functions like landing gear, brakes, and flight controls. Chafing damage could lead to hydraulic fluid leaks and system failure, creating serious safety risks during flight."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to all BAe 125 series 1000A, 1000B and Hawker 1000 aircraft and requires action in accordance with Hawker Raytheon Corporate Jets Mandatory Service Bulletin SB.29-95 (Applicability; Requirement). The document does not indicate any change of scope from its stated purpose of addressing reported chafing between equipment bay structure and hydraulic lines (Background)."},"complexity_factors":["Applicability limited to a small, specific set of aircraft models (Applicability).","Technical requirements are not reproduced in the directive but delegated to an external manufacturer service bulletin (Requirement).","Compliance deadline is given but the AD does not list the detailed steps, parts or man-hours—those are in SB.29-95 (Requirement; Compliance).","Cross-reference to another regulator's classification (UK CAA) adds a regulatory alignment factor but not additional procedural complexity (Note).","Short, single-issue directive with a clear safety trigger (Background), producing low statutory complexity."],"plain_english_summary":"This airworthiness directive requires all British Aerospace BAe 125 series 1000A/1000B and Hawker 1000 operators to complete the manufacturer's Mandatory Service Bulletin SB.29‑95 by 31 June 1995 to remedy reported chafing between equipment‑bay structure and hydraulic lines. Operators/owners must arrange and pay for the work; the regulator enforces compliance and relies on the service bulletin for technical detail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-152-hydraulic-pipes","history":"/api/acts/ad-hs-125-152-hydraulic-pipes/history","analysis":"/api/acts/ad-hs-125-152-hydraulic-pipes/analysis","conflicts":"/api/acts/ad-hs-125-152-hydraulic-pipes/conflicts","importantCases":"/api/acts/ad-hs-125-152-hydraulic-pipes/important-cases","documents":"/api/acts/ad-hs-125-152-hydraulic-pipes/documents"}}