{"id":"F2006B05440","name":"AD/PA-22/4 - Nose Wheel Mount - Stiffener Brace","slug":"ad-pa-22-4-nose-wheel-mount-stiffener-brace","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46160,"registerId":"commonwealth-F2006B05440-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-22/4 - Nose Wheel Mount - Stiffener Brace","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-22/4 Nose Wheel Mount - Stiffener Brace NK\n\nApplicability: Model PA-22 with S/Nos. prior to 22-319 as specified in SL. Document:  Piper SL No. 180.\n\nCompliance: Forthwith.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2597},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive remains tightly scoped to its original purpose — a targeted safety intervention for a specific airworthiness issue (nose wheel mount stiffener brace) affecting a specific aircraft model and production batch. There is no evidence of regulatory scope creep."},"complexity_factors":["Requires cross-reference to external technical document (Piper Service Letter No. 180) for substantive compliance procedures","Applicability limited to simple serial number range check (prior to S/N 22-319)","No defined terms, interpretation sections, or nested conditional logic","Single imperative compliance obligation with no exceptions or alternatives stated"],"plain_english_summary":"This AD mandates immediate compliance with Piper Service Letter No. 180 to inspect/repair the nose wheel mount stiffener brace on Piper PA-22 \"Tri-Pacer\" and \"Colt\" aircraft with serial numbers before 22-319.\n\nIt affects owners/operators of those PA-22s and requires a licensed aircraft maintenance engineer to carry out the procedures and record compliance — necessary to prevent possible nose-gear structural failure during landing, taxiing, or ground operations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace","history":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace/history","analysis":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace/analysis","conflicts":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace/conflicts","importantCases":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace/important-cases","documents":"/api/acts/ad-pa-22-4-nose-wheel-mount-stiffener-brace/documents"}}