{"id":"F2006B05512","name":"AD/PA-23/85 - Hydraulic Hose Inspection","slug":"ad-pa-23-85-hydraulic-hose-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46367,"registerId":"commonwealth-F2006B05512-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/85 - Hydraulic Hose Inspection","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)  Piper PA-23 (Apache and Aztec) Series Aeroplanes\n\n \n\nAD/PA-23/85 Hydraulic Hose Inspection 6/86 DM\n\nApplicability: PA-23-150/160 Apache S/Nos. 23-1 to 23-2046 PA-23-235 Apache S/Nos.\n\n27-505 to 27-622 PA-23-250 Aztec S/Nos. 27-1 to 27-8154030.\n\n \n\nRequirement: Action in accordance with Piper Service Bulletin No. 822. Compliance: Within 10 hours time in service after 19 May 1986.\n\nBackground: A group of hydraulic hoses were manufactured using material that does not meet the pressure requirements for operation in the aircraft hydraulic system.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1986 for a specific technical defect. It has not expanded beyond its original purpose of mandating hydraulic hose inspections for affected Piper aircraft."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined applicability criteria (specific aircraft models and serial number ranges)","Single requirement referencing an external technical document (Piper Service Bulletin No. 822)","Simple compliance deadline (10 hours time in service after fixed date)","No nested conditions, exceptions, or cross-references to other legislation","Straightforward factual background with no legal interpretation required"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of certain Piper Apache and Aztec aeroplanes to inspect their hydraulic hoses. The inspection must follow Piper Service Bulletin No. 822 (a manufacturer's technical instruction).\n\n**Who it affects:** Owners and operators of:\n- Piper PA-23-150/160 Apache aircraft with serial numbers 23-1 through 23-2046\n- Piper PA-23-235 Apache aircraft with serial numbers 27-505 through 27-622  \n- Piper PA-23-250 Aztec aircraft with serial numbers 27-1 through 27-8154030\n\n**Why it matters:** Some hydraulic hoses were made with material that can't handle the pressure needed for the aircraft's hydraulic system. This creates a safety risk — hydraulic failure could affect flight controls, landing gear, or brakes. The directive forces a fix before the problem causes an accident.\n\n**Deadline:** The inspection must be done within 10 hours of flying time after 19 May 1986."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope, as stated in the document, is limited to inspecting/remediating hydraulic hoses on specific PA-23 series aircraft serial-number ranges because those hoses were manufactured from material that does not meet pressure requirements (\"Background\" and \"Applicability\"). The requirement to act per Piper Service Bulletin No. 822 and the 10-hour compliance window align with that stated purpose (\"Requirement\"; \"Compliance\"). There is no indication in the text that the AD’s scope departs from that original stated intent."},"complexity_factors":["Applicability limited to several specific aircraft models and narrow serial-number ranges (requires checking serials against listed ranges). (\"Applicability: ...\")","Mandatory compliance references an external technical document (Piper Service Bulletin No. 822) rather than including inspection and repair steps in the AD itself. (\"Requirement: Action in accordance with Piper Service Bulletin No. 822.\")","Short, fixed compliance window (10 hours time in service after 19 May 1986) creates operational urgency and possible logistical complexity. (\"Compliance: Within 10 hours time in service after 19 May 1986.\")","Background identifies a specific manufacturing defect (hose material failing pressure requirements) but the AD does not specify remedial parts, costs, or who supplies replacements. (\"Background: A group of hydraulic hoses were manufactured using material that does not meet the pressure requirements...\")","Enforcement and cost-allocation mechanics are not detailed in the AD text (no explicit statement of penalties, subsidies, or cost recovery). (General absence across Requirement/Compliance sections.)"],"plain_english_summary":"This airworthiness directive requires operators of specified Piper PA‑23 series aeroplanes (limited model/serial-number ranges) to carry out the inspections and remedial actions set out in Piper Service Bulletin No. 822 within 10 flight hours after 19 May 1986. It was issued because a batch of hydraulic hoses did not meet pressure requirements.\n\nThe rule binds listed aircraft owners/operators (who bear the costs); the regulator mandates compliance and delegates the technical steps to Piper’s service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-85-hydraulic-hose-inspection","history":"/api/acts/ad-pa-23-85-hydraulic-hose-inspection/history","analysis":"/api/acts/ad-pa-23-85-hydraulic-hose-inspection/analysis","conflicts":"/api/acts/ad-pa-23-85-hydraulic-hose-inspection/conflicts","importantCases":"/api/acts/ad-pa-23-85-hydraulic-hose-inspection/important-cases","documents":"/api/acts/ad-pa-23-85-hydraulic-hose-inspection/documents"}}