{"id":"F2006B08225","name":"AD/CESSNA 336/4 - Open Wire Aerial Installation - Modification","slug":"ad-cessna-336-4-open-wire-aerial-installation-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115467,"registerId":"commonwealth-F2006B08225-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 336/4 - Open Wire Aerial Installation - 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)  Cessna 336 Series Aeroplanes\n\n \n\nAD/CESSNA 336/4  Open Wire Aerial Installation - Modification\n\n\n8/66\n\n \n\nApplicability: All models fitted with bakelite aerial stand off mast Cessna P/N 0411217 which have aerials rigged in a manner which applies a side load to the mast.\n\n \n\nRequirement: Re-rig aerials to remove any side load from the mast or replace mast with one of a type suitable for the loads applied.\n\n \n\nNote: Rex Aviation mast, comprising rod P/No. RA-483 and bracket P/No. RA-482-A or RA-482-B is a suitable replacement.\n\n \n\nCompliance: Within 300 hours time in service after 15 August 1969.\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":1366},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope addressing a specific airworthiness defect in Cessna 336 aircraft aerial mounting systems. It has not expanded beyond this single mechanical safety issue."},"complexity_factors":["Single, unambiguous operative requirement","No interpretation section or defined terms","Zero cross-references to other legislative provisions","Clear applicability criteria using specific part numbers","Simple binary compliance option (re-rig OR replace)","Document length is less than 150 words"],"plain_english_summary":"This is a **safety directive** for owners of Cessna 336 aircraft. It orders them to fix a dangerous design flaw where radio antenna (aerial) wires are pulling sideways on weak plastic (bakelite) mounting masts, which can cause them to snap in flight.\n\n**What owners must do:**\n- **Option 1:** Re-rig (reposition) the aerial wires so they don't pull sideways on the mast; OR\n- **Option 2:** Replace the weak plastic mast with a stronger metal one (the document notes that Rex Aviation masts part numbers RA-483 with brackets RA-482-A or RA-482-B are suitable).\n\n**Who it affects:** All Cessna 336 models fitted with the specific bakelite aerial stand-off mast (Part Number 0411217) where the aerials apply a side load.\n\n**When it had to be done:** Within 300 hours of flying time after 15 August 1969."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-336-4-open-wire-aerial-installation-modification","history":"/api/acts/ad-cessna-336-4-open-wire-aerial-installation-modification/history","analysis":"/api/acts/ad-cessna-336-4-open-wire-aerial-installation-modification/analysis","conflicts":"/api/acts/ad-cessna-336-4-open-wire-aerial-installation-modification/conflicts","importantCases":"/api/acts/ad-cessna-336-4-open-wire-aerial-installation-modification/important-cases","documents":"/api/acts/ad-cessna-336-4-open-wire-aerial-installation-modification/documents"}}