{"id":"F2006B05422","name":"AD/PA-22/18 - Horizontal Stabiliser Trim Control Screw Mechanism - Stop Installation","slug":"ad-pa-22-18-horizontal-stabiliser-trim-control-screw-mechanism-stop-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46101,"registerId":"commonwealth-F2006B05422-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-22/18 - Horizontal Stabiliser Trim Control Screw Mechanism - Stop Installation","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-22 (Tri-Pacer and Colt) Series Aeroplanes\n\n \n\nAD/PA-22/18  Horizontal Stabiliser Trim Control Screw Mechanism - Stop Installation\n\n\n6/62\n\n \n\nApplicability: All models.\n\n \n\nRequirement: Modify the horizontal stabiliser trim control screw mechanism by installing a stop to prevent the yoke assembly (P/N 42692-00) from binding against the pulley (P/N 12982-00) when the mechanism is wound to the extreme nose-down position.\n\n \n\nNote: W.E. James Aircraft Pty. Ltd. Drawing No. WEJ-65 covers an approved means of compliance.\n\n \n\nCompliance: Forthwith.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1581},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive remains tightly focused on its original purpose: mandating a specific physical safety modification to prevent mechanical binding in the horizontal stabiliser trim system. No expansion beyond this narrow airworthiness safety objective is evident."},"complexity_factors":["Single, unambiguous mechanical modification requirement","No defined terms or interpretation section","No nested exceptions or conditional provisions","Only one cross-reference (to approved drawing WEJ-65)","Immediate compliance deadline with no alternative timeframes"],"plain_english_summary":"This Airworthiness Directive (AD) is a mandatory safety order for **Piper PA-22 Tri-Pacer and Colt aircraft**.\n\n**What it requires:**\nOwners must install a physical stop on the horizontal stabiliser trim control screw mechanism. This prevents the yoke assembly (part number 42692-00) from jamming against a pulley (part number 12982-00) when the trim is wound to the extreme nose-down position.\n\n**Who is affected:**\nAll models of the Piper PA-22 series.\n\n**How to comply:**\nThe modification must be carried out immediately (\"forthwith\"). Operators may use **W.E. James Aircraft Pty. Ltd. Drawing No. WEJ-65** as an approved method to complete the work.\n\n**Why it matters:**\nThis prevents a mechanical binding failure in the trim system that could compromise aircraft control, ensuring the horizontal stabiliser operates safely throughout its full range of movement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-18-horizontal-stabiliser-trim-control-screw-mechanism-stop-installation","history":"/api/acts/ad-pa-22-18-horizontal-stabiliser-trim-control-screw-mechanism-stop-installation/history","analysis":"/api/acts/ad-pa-22-18-horizontal-stabiliser-trim-control-screw-mechanism-stop-installation/analysis","conflicts":"/api/acts/ad-pa-22-18-horizontal-stabiliser-trim-control-screw-mechanism-stop-installation/conflicts","importantCases":"/api/acts/ad-pa-22-18-horizontal-stabiliser-trim-control-screw-mechanism-stop-installation/important-cases","documents":"/api/acts/ad-pa-22-18-horizontal-stabiliser-trim-control-screw-mechanism-stop-installation/documents"}}