{"id":"F2006B05607","name":"AD/PA-28/49 - Air Conditioning System - Modification","slug":"ad-pa-28-49-air-conditioning-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135218,"registerId":"commonwealth-F2006B05607-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/49 - Air Conditioning System - 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-28 Series Aeroplanes\n\n \n\nAD/PA-28/49 Air Conditioning System - Modification 10/74\n\nApplicability: All the following models when fitted with factory installed air conditioning systems: Model PA-28-140 with S/Nos. 28-250001, 28-7125472 to 28-7425343,\n\nModel PA-28- 180 with S/Nos. 28-5653, 28-7205092 to 28-7405188. Model PA-28R-200 with S/Nos. 28R-8235001 to 28R-7435255.\n\nDocument: Piper SB No. 427.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 1974.\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":1940},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original 1974 directive maintaining its initial scope—a targeted safety modification for specific Piper aircraft models with factory-installed air conditioning systems."},"complexity_factors":["Specific serial number ranges requiring precise aircraft identification","Single external technical reference (Piper Service Bulletin 427) containing the actual modification instructions","Compliance measured in flight hours ('time in service') rather than calendar days","Narrow applicability limited to factory-installed air conditioning systems only"],"plain_english_summary":"This mandatory Airworthiness Directive orders owners/operators of certain Piper PA‑28 aircraft with factory‑installed air conditioning to modify the A/C system per Piper Service Bulletin No. 427. It applies only to specific serial-numbered PA‑28-140/180/PA‑28R‑200 airframes (see directive for the exact serials) and must be completed within 100 hours time‑in‑service after 31 October 1974.  \n\nComplying is legally required for airworthiness; flying without the modification violates aviation law and is unsafe."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-49-air-conditioning-system-modification","history":"/api/acts/ad-pa-28-49-air-conditioning-system-modification/history","analysis":"/api/acts/ad-pa-28-49-air-conditioning-system-modification/analysis","conflicts":"/api/acts/ad-pa-28-49-air-conditioning-system-modification/conflicts","importantCases":"/api/acts/ad-pa-28-49-air-conditioning-system-modification/important-cases","documents":"/api/acts/ad-pa-28-49-air-conditioning-system-modification/documents"}}