{"id":"F2006B05457","name":"AD/PA-23/27 - Wing Flaps - Inspection and Modification","slug":"ad-pa-23-27-wing-flaps-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46214,"registerId":"commonwealth-F2006B05457-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/27 - Wing Flaps - Inspection and Modification","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-23/27 Wing Flaps - Inspection and Modification 5/62\n\nApplicability: Model PA-23-250 with S/Nos. 27-1 to 27-451 inclusive 27.453 to 27-504. Document:               Piper SL No. 363.\n\nCompliance: At intervals not exceeding 100 hours time in service after 25 May 1962 until modified.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2111},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope. It addresses a specific airworthiness issue concerning wing flap integrity on defined aircraft models and has not expanded beyond this targeted safety requirement."},"complexity_factors":["Single, specific maintenance action required","Narrow applicability limited to defined aircraft serial number ranges","Simple recurring compliance interval (100 hours time in service)","Relies on external technical document (Piper Service Letter 363) for actual procedures"],"plain_english_summary":"**What this does:** Requires recurring safety inspections and modifications for the wing flaps on specific Piper aircraft.\n\n**Who it affects:** Owners and operators of Piper PA-23-250 Apache and Aztec aeroplanes with serial numbers 27-1 to 27-451 inclusive, and 27-453 to 27-504.\n\n**What you must do:** Inspect and modify the wing flaps in accordance with Piper Service Letter No. 363. You must perform this every **100 hours of flight time** (called \"time in service,\" meaning the time from when the engine starts for flight until it shuts down) starting from 25 May 1962. You must keep doing these checks until the modification is permanently installed.\n\n**Why it matters:** This prevents mechanical failures in the wing flap system, which is essential for controlling the aircraft during takeoff and landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-27-wing-flaps-inspection-and-modification","history":"/api/acts/ad-pa-23-27-wing-flaps-inspection-and-modification/history","analysis":"/api/acts/ad-pa-23-27-wing-flaps-inspection-and-modification/analysis","conflicts":"/api/acts/ad-pa-23-27-wing-flaps-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-pa-23-27-wing-flaps-inspection-and-modification/important-cases","documents":"/api/acts/ad-pa-23-27-wing-flaps-inspection-and-modification/documents"}}