{"id":"F2006B05724","name":"AD/PA-31/19 - Flap Track and Rudder Tip Rib Assemblies - Inspection","slug":"ad-pa-31-19-flap-track-and-rudder-tip-rib-assemblies-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135523,"registerId":"commonwealth-F2006B05724-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/19 - Flap Track and Rudder Tip Rib Assemblies - 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-31 Series Aeroplanes\n\n \n\nAD/PA-31/19 Flap Track and Rudder Tip Rib Assemblies - Inspection\n\n\n12/71\n\n \n\nApplicability: For Part 1 of SL No. 594 - Model PA-31 with S/Nos. prior to 31-172. For Part 2 of SL No. 594 - Models PA-31 and PA-31-300 with S/Nos. prior to 31-460.\n\n \n\nDocument: SL No. 594.\n\n \n\nCompliance: Within 100 hours time in service after 31 December 1971.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1228},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope as a one-time safety inspection requirement for defined aircraft models, with no expansion beyond the specific flap track and rudder components originally identified."},"complexity_factors":["Single, unambiguous compliance requirement","Limited applicability to specific aircraft models and serial number ranges","No exceptions, exemptions, or conditional clauses","Only one cross-reference (to Service Letter No. 594)","Extremely short length with plain language instructions"],"plain_english_summary":"This Airworthiness Directive (AD) mandates safety inspections for specific Piper aircraft to check for defects in critical flight control components.\n\n**Who it affects:**\nOwners and operators of:\n- Piper PA-31 model aircraft with serial numbers before 31-172\n- Piper PA-31 and PA-31-300 model aircraft with serial numbers before 31-460\n\n**What you must do:**\nInspect the **flap track** (the mechanism that guides wing flaps) and **rudder tip rib assemblies** (structural parts of the tail rudder) according to the instructions in **Service Letter No. 594** (the manufacturer's technical bulletin).\n\n**When:**\nWithin **100 hours of flight time** (counted from when the aircraft is airborne) after 31 December 1971.\n\nThis ensures these specific older aircraft meet safety standards and remain legally airworthy."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-19-flap-track-and-rudder-tip-rib-assemblies-inspection","history":"/api/acts/ad-pa-31-19-flap-track-and-rudder-tip-rib-assemblies-inspection/history","analysis":"/api/acts/ad-pa-31-19-flap-track-and-rudder-tip-rib-assemblies-inspection/analysis","conflicts":"/api/acts/ad-pa-31-19-flap-track-and-rudder-tip-rib-assemblies-inspection/conflicts","importantCases":"/api/acts/ad-pa-31-19-flap-track-and-rudder-tip-rib-assemblies-inspection/important-cases","documents":"/api/acts/ad-pa-31-19-flap-track-and-rudder-tip-rib-assemblies-inspection/documents"}}