{"id":"F2006B05965","name":"AD/PA-38/26 - Carburettor Air Box Valve","slug":"ad-pa-38-26-carburettor-air-box-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136141,"registerId":"commonwealth-F2006B05965-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-38/26 - Carburettor Air Box Valve","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-38 (Tomahawk) Series Aeroplanes\n\n \n\nAD/PA-38/26 Carburettor Air Box Valve 12/86\n\nApplicability: PA-38-112 series, with serial numbers 38-78A0001 through 38-82A0122. Requirement:               Action in accordance with Piper Service Bulletin No. 851.\n\nCompliance: Unless previously accomplished, at the next periodic inspection after 31 December 1986.\n\n \n\nBackground:  The manufacturer has received reports of screws vibrating loose in the carburettor air box valve assembly. This can result in loss of carburettor heat control, loss of engine power in flight and/or ingestion of loose fasteners into the engine.\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":1175},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope addressing the specific mechanical defect in the carburettor air box valve assembly for the identified aircraft models."},"complexity_factors":["Single mechanical issue with clear safety rationale","Applicability limited to specific serial number range only","Single compliance action referencing external technical standard (Piper Service Bulletin)","No legislative cross-references or defined terms","Plain language background section explaining the safety risk"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order from the Civil Aviation Safety Authority (CASA) requiring aircraft owners to fix a specific mechanical defect.\n\n**Who it affects:**\nOwners and operators of **Piper PA-38-112 Tomahawk** aeroplanes with serial numbers between 38-78A0001 and 38-82A0122.\n\n**What the problem is:**\nThe manufacturer reported that screws in the **carburettor air box valve assembly** can vibrate loose during flight. This is dangerous because it can cause:\n- Loss of carburettor heat (used to prevent engine icing)\n- Loss of engine power\n- Loose screws being sucked into the engine\n\n**What must be done:**\nInspect and repair the carburettor air box valve following **Piper Service Bulletin No. 851**.\n\n**When to do it:**\nBy the next scheduled periodic inspection after **31 December 1986** (unless already fixed)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-38-26-carburettor-air-box-valve","history":"/api/acts/ad-pa-38-26-carburettor-air-box-valve/history","analysis":"/api/acts/ad-pa-38-26-carburettor-air-box-valve/analysis","conflicts":"/api/acts/ad-pa-38-26-carburettor-air-box-valve/conflicts","importantCases":"/api/acts/ad-pa-38-26-carburettor-air-box-valve/important-cases","documents":"/api/acts/ad-pa-38-26-carburettor-air-box-valve/documents"}}