{"id":"F2006B05618","name":"AD/PA-28/61 - Lower Cowl Drain - Inspection and Modification","slug":"ad-pa-28-61-lower-cowl-drain-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135258,"registerId":"commonwealth-F2006B05618-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/61 - Lower Cowl Drain - Inspection and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-28 Series Aeroplanes\n\n \n\nAD/PA-28/61 Lower Cowl Drain - Inspection and Modification 5/77\n\nApplicability: Models PA-28-150, PA-28-160 and PA-28-180 with S/Nos. 28-1761 to 28-7505259.\n\n \n\nModel PA-28-181 with S/Nos. 28-7690001 to 28-7790103. Model PA-28-235 with S/Nos. 28-10001 to 28-7310176.\n\nDocument: Piper SL No. 796.\n\n \n\nCompliance: Within 100 hours time in service after 31 May 1977.\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":1370},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains narrowly focused on its original purpose: mandating inspection and modification of lower cowl drains on specific Piper PA-28 aircraft models. There is no evidence of scope creep or expansion beyond this specific mechanical safety issue."},"complexity_factors":["Extremely brief document with only four substantive sections","No defined terms or interpretation section","Single, unambiguous compliance requirement","Applicability limited to specific aircraft models and serial number ranges","No cross-references to other legislative instruments or regulations"],"plain_english_summary":"**What this is:** A mandatory safety instruction (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA) requiring specific maintenance work on certain Piper Cherokee aeroplanes.\n\n**Who it affects:** Owners and operators of specific Piper PA-28 models:\n- PA-28-150, PA-28-160, and PA-28-180 (serial numbers 28-1761 to 28-7505259)\n- PA-28-181 (serial numbers 28-7690001 to 28-7790103)  \n- PA-28-235 (serial numbers 28-10001 to 28-7310176)\n\n**What must be done:** The lower cowl drain (an opening that allows water and debris to exit the engine compartment) must be inspected and modified according to technical instructions in Piper Service Letter No. 796.\n\n**When:** The work must be completed within 100 hours of flight time after 31 May 1977.\n\n**Why it matters:** This prevents potential safety issues such as engine cooling problems or corrosion caused by blocked or inadequate drainage in the engine cowling."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-61-lower-cowl-drain-inspection-and-modification","history":"/api/acts/ad-pa-28-61-lower-cowl-drain-inspection-and-modification/history","analysis":"/api/acts/ad-pa-28-61-lower-cowl-drain-inspection-and-modification/analysis","conflicts":"/api/acts/ad-pa-28-61-lower-cowl-drain-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-pa-28-61-lower-cowl-drain-inspection-and-modification/important-cases","documents":"/api/acts/ad-pa-28-61-lower-cowl-drain-inspection-and-modification/documents"}}