{"id":"F2006B05661","name":"AD/PA-30/19 - Airflow Modification Kit - Installation","slug":"ad-pa-30-19-airflow-modification-kit-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135370,"registerId":"commonwealth-F2006B05661-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-30/19 - Airflow Modification Kit - Installation","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-30 & 39 (Twin Comanche) Series Aeroplanes\n\n \n\nAD/PA-30/19 Airflow Modification Kit - Installation 7/72\n\nApplicability: Model PA-30 with S/Nos. prior to 30-2000 which are not modified as detailed in SL No. 558 instructions para. 3.\n\n \n\nDocument:  Piper SL No. 558. Compliance: Before 1 July 1972.\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":1317},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains a tightly focused scope targeting a specific airworthiness issue (airflow) for a discrete subset of PA-30 aircraft. No evidence of scope creep or expansion beyond the original safety modification intent."},"complexity_factors":["Narrow applicability limited to specific serial number range (S/N prior to 30-2000)","Single exemption criterion (aircraft already modified per SL No. 558, para. 3)","Only one mandatory action required (installation of the kit)","Single external technical reference document"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it requires:** Owners and operators must install an **Airflow Modification Kit** on specific Piper Twin Comanche aircraft.\n\n**Who it affects:** This applies to **Piper PA-30 model aeroplanes** with serial numbers **prior to 30-2000**, except those already modified according to Piper Service Letter No. 558, paragraph 3.\n\n**Why it matters:** The directive corrects a safety issue related to airflow (likely affecting engine cooling or aerodynamic performance) that could compromise flight safety if left unaddressed.\n\n**Compliance deadline:** The modification had to be completed **before 1 July 1972**.\n\n**Technical details:** The specific installation instructions are contained in **Piper Service Letter (SL) No. 558**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-30-19-airflow-modification-kit-installation","history":"/api/acts/ad-pa-30-19-airflow-modification-kit-installation/history","analysis":"/api/acts/ad-pa-30-19-airflow-modification-kit-installation/analysis","conflicts":"/api/acts/ad-pa-30-19-airflow-modification-kit-installation/conflicts","importantCases":"/api/acts/ad-pa-30-19-airflow-modification-kit-installation/important-cases","documents":"/api/acts/ad-pa-30-19-airflow-modification-kit-installation/documents"}}