{"id":"F2006B05498","name":"AD/PA-23/71 - Emergency Gear Extension System - Inspection","slug":"ad-pa-23-71-emergency-gear-extension-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46343,"registerId":"commonwealth-F2006B05498-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/71 - Emergency Gear Extension System - 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-23/71 Emergency Gear Extension System - Inspection 7/77\n\nApplicability: Models PA23-250 and PA-E23-250 with S/Nos. 27-2659 to 27-7754039. Document:               Piper SB No. 564.\n\nCompliance: Within 100 hours time in service after 31 July 1977.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1882},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope as a one-time inspection requirement for the emergency landing gear backup system on specific Piper aircraft models. No expansion of scope detected since original issuance."},"complexity_factors":["Requires cross-reference to external technical document (Piper Service Bulletin No. 564) to determine actual inspection procedures","Applicability limited to specific serial number ranges requiring aircraft logbook verification","Uses technical aviation term 'time in service' (flight hours) rather than calendar days for compliance deadline"],"plain_english_summary":"**What this is:** A mandatory safety order (Airworthiness Directive) issued by the aviation regulator requiring specific aircraft owners to conduct a safety inspection.\n\n**Who it affects:** Owners and operators of **Piper PA-23-250 and PA-E23-250** model aeroplanes (Apache and Aztec series) with serial numbers from **27-2659 to 27-7754039**.\n\n**What you must do:** Inspect the **emergency gear extension system** — the backup mechanism that manually lowers the landing wheels if the main hydraulic or electrical system fails. The inspection must follow the technical procedures outlined in **Piper Service Bulletin No. 564**.\n\n**When:** Complete the inspection within **100 hours of flight time** (counting only hours the aircraft is actually flying, not sitting on the ground) after 31 July 1977.\n\n**Why this matters:** A faulty emergency gear system could trap a pilot with wheels-up when the primary landing gear fails, almost certainly resulting in a dangerous belly-landing or crash."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-71-emergency-gear-extension-system-inspection","history":"/api/acts/ad-pa-23-71-emergency-gear-extension-system-inspection/history","analysis":"/api/acts/ad-pa-23-71-emergency-gear-extension-system-inspection/analysis","conflicts":"/api/acts/ad-pa-23-71-emergency-gear-extension-system-inspection/conflicts","importantCases":"/api/acts/ad-pa-23-71-emergency-gear-extension-system-inspection/important-cases","documents":"/api/acts/ad-pa-23-71-emergency-gear-extension-system-inspection/documents"}}