{"id":"F2006B02965","name":"AD/B737/65 - Radio Control Panels","slug":"ad-b737-65-radio-control-panels","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42307,"registerId":"commonwealth-F2006B02965-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/65 - Radio Control Panels","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)  Boeing 737 Series Aeroplanes\n\n \n\nAD/B737/65 Radio Control Panels 2/92\n\nApplicability: Boeing 737 series aircraft equipped with Boeing part number 285U0037-104, -105, - 201, -202 or -203 series radio control panels.\n\n \n\nRequirement: Remove radio control panels, part numbered 285U0037-104, -105, -201, -202 and - 203 and replace with part numbers 285U0037-304, -305, -301, -302 and -303 respectively.\n\n \n\nNote: FAA AD 91-21-12 refers.\n\n \n\nCompliance: Prior to 12 January 1993.\n\n \n\nBackground: Country of origin AD. To prevent uncommanded frequency changes of the high frequency (HF) and very high frequency (VHF) radios.\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 AD's scope is confined to Boeing 737 series aeroplanes fitted with the listed old radio control panel part numbers and mandates their replacement by specified new part numbers by a firm deadline. The document mirrors the country-of-origin FAA AD (Note) and does not expand applicability, add exemptions, or change the required action. There is no indication within the text that the scope was changed from the original intent described in the instrument."},"complexity_factors":["Narrow applicability: limited to Boeing 737 series aircraft fitted with five specific old part numbers. (Applicability)","Single, discrete technical action: removal and replacement of specified parts with exact replacement part numbers. (Requirement)","Clear, hard compliance deadline (prior to 12 January 1993). (Compliance)","Dependence on part availability and maintenance capacity (operational logistics). (Requirement; Compliance)","Cross-reference to an FAA AD as the country-of-origin source (legal provenance). (Note)","No conditional exemptions or alternate compliance routes stated (deterministic compliance path). (Requirement)","Potential supplier concentration because replacements are specified by part number (procurement effect). (Requirement)"],"plain_english_summary":"This directive requires Boeing 737s fitted with certain older radio control panels to have those panels replaced with designated upgraded units by 12 January 1993. CASA enforces the rule, which adopts an FAA airworthiness directive.\n\nIt affects aircraft owners/operators (or their maintenance providers), who must procure parts, schedule the swap and bear costs and downtime to prevent uncommanded HF/VHF frequency changes."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused solely on replacing specific defective radio components in Boeing 737 aircraft. It has not expanded beyond its original technical purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 5 specific part numbers affected, with direct one-to-one replacement mapping","Single unconditional requirement with no exceptions or conditional logic","No defined terms section — all language is technical but self-explanatory","No cross-references to other legislation (only a non-binding note referencing the related FAA directive)","Clear, fixed compliance date with no alternative methods or phased implementation"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of certain Boeing 737 aircraft to swap out specific radio control panels (the cockpit devices pilots use to tune radio frequencies) with updated replacement parts.\n\n**Who it affects:**\nAnyone operating Boeing 737 series aircraft fitted with radio control panels bearing part numbers 285U0037-104, -105, -201, -202, or -203.\n\n**Why it matters:**\nThe old panels had a dangerous fault — they could spontaneously change radio frequencies without the pilot touching them (\"uncommanded frequency changes\"). This could cut off critical communication with air traffic control during flight, creating serious safety risks. The directive gives a hard deadline (before 12 January 1993) to fix the problem.\n\n**Key details:**\n- **Old parts to remove:** 285U0037-104, -105, -201, -202, -203\n- **New parts to install:** 285U0037-304, -305, -301, -302, -303 (respectively)\n- **Origin:** This mirrors an American Federal Aviation Administration (FAA) directive (AD 91-21-12), showing Australia adopting a safety fix developed overseas"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-65-radio-control-panels","history":"/api/acts/ad-b737-65-radio-control-panels/history","analysis":"/api/acts/ad-b737-65-radio-control-panels/analysis","conflicts":"/api/acts/ad-b737-65-radio-control-panels/conflicts","importantCases":"/api/acts/ad-b737-65-radio-control-panels/important-cases","documents":"/api/acts/ad-b737-65-radio-control-panels/documents"}}