{"id":"F2006B05662","name":"AD/PA-30/2 - Carburettor Alternative Air Doors - Replacement","slug":"ad-pa-30-2-carburettor-alternative-air-doors-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135373,"registerId":"commonwealth-F2006B05662-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-30/2 - Carburettor Alternative Air Doors - Replacement","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-30/2 Carburettor Alternative Air Doors - Replacement 5/64\n\nApplicability: Model PA-30 with S/Nos. 30-1 to 30-321. Document:  Piper SB No. 220.\n\nCompliance: Forthwith.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive, as provided, applies only to Piper PA-30 aircraft with serial numbers 30-1 through 30-321 and mandates replacement of the carburettor alternative air doors per Piper SB No. 220 with immediate effect. There is no indication in the supplied text that the applicability or required action differs from its original stated scope."},"complexity_factors":["Narrow applicability limited to a single model and explicit serial-number range (Applicability: Model PA-30 with S/Nos. 30-1 to 30-321).","Single mandated action (replacement of carburettor alternative air doors) referenced to one service bulletin (Document: Piper SB No. 220).","Immediate compliance requirement reduces scheduling flexibility but does not add procedural complexity (Compliance: Forthwith).","Regulatory source and authority are explicit (Part 39, Schedule of Airworthiness Directives), so legal basis is straightforward.","Lack of further procedural or enforcement detail in the text limits interpretive ambiguity but shifts technical detail to the referenced service bulletin (Document: Piper SB No. 220)."],"plain_english_summary":"This airworthiness directive mandates immediate replacement of the carburettor alternative air doors on Piper PA‑30 aeroplanes serial numbers 30‑1 through 30‑321, to be carried out per Piper Service Bulletin No. 220. It directly affects owners/operators (who bear parts and labour costs) and requires maintenance organisations to prioritise and perform the work forthwith under the referenced service bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1964 (indicated by '5/64' — May 1964). It addresses one specific mechanical defect in a defined population of aircraft. There is no evidence of scope creep; it remains tightly focused on its original safety purpose."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","No defined terms section — uses plain technical language","No cross-references to other legislation or regulations beyond a single service bulletin citation","Simple conditional structure: single applicability criterion (serial number range) triggers single mandatory action","No exceptions, exemptions, or nested conditions","Clear, unambiguous compliance deadline ('forthwith')"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:** It requires owners and operators of specific Piper PA-30 Twin Comanche aircraft (serial numbers 30-1 through 30-321) to replace the \"carburettor alternative air doors.\" These are components that control backup air intake to the engine's carburettor. The directive references Piper Service Bulletin No. 220 as the technical guide for the replacement.\n\n**Who it affects:** Anyone who owns, operates, or maintains the early production Piper PA-30 aircraft with those specific serial numbers.\n\n**Why it matters:** The \"compliance: forthwith\" language means this must be done immediately — not at the next scheduled maintenance. This suggests a serious safety issue where the existing air doors could fail or malfunction, potentially causing engine problems in flight. Ignoring this directive would make the aircraft unairworthy (illegal to fly).\n\n**Key details:**\n- **Aircraft affected:** Piper PA-30 Twin Comanche, serial numbers 30-1 to 30-321\n- **Action required:** Replace the carburettor alternative air doors\n- **When:** Immediately (\"forthwith\")\n- **Technical reference:** Follow Piper Service Bulletin No. 220"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-30-2-carburettor-alternative-air-doors-replacement","history":"/api/acts/ad-pa-30-2-carburettor-alternative-air-doors-replacement/history","analysis":"/api/acts/ad-pa-30-2-carburettor-alternative-air-doors-replacement/analysis","conflicts":"/api/acts/ad-pa-30-2-carburettor-alternative-air-doors-replacement/conflicts","importantCases":"/api/acts/ad-pa-30-2-carburettor-alternative-air-doors-replacement/important-cases","documents":"/api/acts/ad-pa-30-2-carburettor-alternative-air-doors-replacement/documents"}}