{"id":"F2006B06627","name":"AD/ROBIN/29 - Hydraulic Lines","slug":"ad-robin-29-hydraulic-lines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48503,"registerId":"commonwealth-F2006B06627-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ROBIN/29 - Hydraulic Lines","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)  Robin Aviation Series Aeroplanes\n\n \n\nAD/ROBIN/29 Hydraulic Lines 11/96\n\nApplicability: All HR 100/250 and HR 100/285 series aircraft fitted with retractable landing gear.\n\n \n\nRequirement: Replace the inlet and outlet pipes of the Retractable Gear (R/G) hydraulic pump as required by Avions Pierre Robin SB No 148 dated April 26, 1996.\n\n \n\nNote: DGAC AD 96-147(A) refers.\n\n \n\nCompliance: Unless previously carried out, at the next scheduled aircraft maintenance inspection and thereafter, at every second disassembly of the pipes.\n\n \n\nBackground: The manufacturer has advised that frequent removal and re-tightening of the tube fitting nuts located at the end of the fluid pipes has resulted in cracking of the tubing flares.\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, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating hydraulic line replacement to prevent cracking failures."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (aircraft model and landing gear type)","Single, clear mechanical requirement with reference to external technical standard","Simple compliance timeline (next inspection + recurring interval)","No nested exceptions, conditional logic, or cross-references to other legislation","Background explanation is straightforward and non-technical"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**Who it affects:** Owners and operators of **Robin HR 100/250 and HR 100/285 series aircraft** that have retractable landing gear. These are light, single-engine French-designed aeroplanes.\n\n**What it requires:** You must **replace the inlet and outlet pipes** (the hydraulic lines) on the retractable landing gear pump. You need to follow the manufacturer's Service Bulletin (SB No 148, dated 26 April 1996) to do this correctly.\n\n**When you must comply:**\n- If you haven't done this already, do it at your **next scheduled maintenance inspection**.\n- After that, you must replace these pipes **every second time they are disconnected** (taken apart).\n\n**Why it matters:** The manufacturer found that repeatedly unscrewing and re-tightening the nuts on these hydraulic pipes was causing **cracks in the pipe ends** (the \"flares\"). Cracked hydraulic lines can leak, potentially causing the landing gear to fail to extend or retract — a serious safety risk.\n\n**Key point:** This isn't optional. Airworthiness Directives are legally binding. Ignoring this could make your aircraft unairworthy and invalidate your insurance."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope as stated in the instrument applies only to the named HR 100 variants with retractable landing gear and requires replacement of the R/G hydraulic pump inlet and outlet pipes per Avions Pierre Robin SB No 148. The AD sets a maintenance‑linked compliance schedule and references a foreign AD; nothing in the text expands the affected fleet or components beyond that applicability (see 'Applicability' and 'Requirement')."},"complexity_factors":["Narrow applicability — applies only to 'All HR 100/250 and HR 100/285 series aircraft fitted with retractable landing gear' (Applicability).","Mandated action references external document — replacement must follow 'Avions Pierre Robin SB No 148 dated April 26, 1996' (Requirement), requiring access to and compliance with that Service Bulletin.","Specific compliance timing — 'at the next scheduled aircraft maintenance inspection and thereafter, at every second disassembly of the pipes' (Compliance) creates a recurring timing rule tied to maintenance events rather than calendar intervals.","Conditional exclusion — 'Unless previously carried out' (Compliance) allows prior completion to satisfy the AD, requiring record checks.","Cross‑reference to foreign AD — 'Note: DGAC AD 96-147(A) refers.' introduces an additional external reference for operators and maintainers.","Identified mechanical cause — 'frequent removal and re‑tightening of the tube fitting nuts ... resulted in cracking of the tubing flares' (Background) specifies the failure mechanism the measure targets, shaping the replacement requirement."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Robin HR 100/250 and HR 100/285 aeroplanes with retractable landing gear to replace the inlet and outlet pipes of the retractable‑gear hydraulic pump in accordance with Avions Pierre Robin Service Bulletin No. 148 (26 April 1996). Compliance is due at the next scheduled maintenance and thereafter at every second disassembly of the pipes; owners/operators pay for and must arrange the work. The measure responds to cracking of tubing flares caused by frequent removal and re‑tightening of tube fitting nuts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-robin-29-hydraulic-lines","history":"/api/acts/ad-robin-29-hydraulic-lines/history","analysis":"/api/acts/ad-robin-29-hydraulic-lines/analysis","conflicts":"/api/acts/ad-robin-29-hydraulic-lines/conflicts","importantCases":"/api/acts/ad-robin-29-hydraulic-lines/important-cases","documents":"/api/acts/ad-robin-29-hydraulic-lines/documents"}}