{"id":"F2006B10274","name":"AD/GENERAL/42 - Microphone/Compass Safe Distance - Modification","slug":"ad-general-42-microphone-compass-safe-distance-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55953,"registerId":"commonwealth-F2006B10274-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GENERAL/42 - Microphone/Compass Safe Distance - 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)  Aircraft - General\n\n \n\nAD/GENERAL/42 Microphone/Compass Safe Distance - Modification\n\n\n4/68\n\n \n\nApplicability: All aircraft in which microphone stowage does not provide at least 38 cm or 15 inches separation between stowed microphones and any direct reading magnetic compass.\n\n \n\nRequirement: Relocate microphone stowage or the direct reading magnetic compass to provide at least 38 cm or 15 inches separation between stowed microphones and any direct reading magnetic compass.\n\n \n\nNote: Where alterations are made which may affect compass calibration care should be taken to observe the requirements of Air Navigation Order Section 108.6.\n\n \n\nCompliance: Before 1 May 1968.\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":1667},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This remains a focused technical safety directive addressing electromagnetic interference between cockpit equipment. The scope is limited to ensuring physical separation between microphones and magnetic compasses, consistent with its original aviation safety purpose."},"complexity_factors":["Single quantitative measurement requirement (38 cm/15 inches)","No defined terms or interpretation section","Single, straightforward compliance action (relocate equipment)","Minimal conditional logic (binary applicability test)","One brief cross-reference to external calibration standards"],"plain_english_summary":"**What this means:**\nThis safety rule requires aircraft owners to keep stored microphones at least 38 cm (15 inches) away from magnetic compasses.\n\n**Why it matters:**\nMicrophones contain magnets that can interfere with compass readings, potentially causing dangerous navigation errors.\n\n**Who must comply:**\nAll aircraft where the microphone storage location is currently closer than 38 cm (15 inches) to any direct-reading magnetic compass.\n\n**What must be done:**\nEither move the microphone stowage (storage location) or relocate the compass to achieve the required separation. If modifications affect compass accuracy, you must also follow the calibration requirements in Air Navigation Order Section 108.6.\n\n**Compliance deadline:**\nBefore 1 May 1968."}},"importantCases":[],"_links":{"self":"/api/acts/ad-general-42-microphone-compass-safe-distance-modification","history":"/api/acts/ad-general-42-microphone-compass-safe-distance-modification/history","analysis":"/api/acts/ad-general-42-microphone-compass-safe-distance-modification/analysis","conflicts":"/api/acts/ad-general-42-microphone-compass-safe-distance-modification/conflicts","importantCases":"/api/acts/ad-general-42-microphone-compass-safe-distance-modification/important-cases","documents":"/api/acts/ad-general-42-microphone-compass-safe-distance-modification/documents"}}