{"id":"F2006B03570","name":"AD/BAL/9 Amdt 1 - Instruments in Thermal Airships","slug":"ad-bal-9-amdt-1-instruments-in-thermal-airships","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43137,"registerId":"commonwealth-F2006B03570-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAL/9 Amdt 1 - Instruments in Thermal Airships","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)  Hot Air Balloons\n\n \n\nAD/BAL/9\n\nAmdt 1\n\n\nInstruments in Thermal Airships 9/90\n\n \n\nApplicability: All thermal airships for which a system of maintenance has not been approved pursuant to CAR 38(3).\n\n \n\nRequirement: Carry out a calibration check of all instruments in accordance with manufacturer’s instructions/specifications.\n\n \n\nCompliance: At intervals not exceeding three years.\n\n \n\nBackground: Whilst CAR 2 definition of aircraft covers airships the decision to have thermal airships maintained IAW CAO 100.54 means in the absence of a major inspection a period must be specified for the calibration of instruments.\n\n \n\nThis inspection requirement has been extended to all thermal airships.\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":1514},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the instrument calibration requirement to cover all thermal airships without approved maintenance systems. The background text explicitly states the requirement has been 'extended to all thermal airships,' indicating the previous version applied to a narrower subset of these aircraft."},"complexity_factors":["Single compliance obligation with unambiguous time-based trigger (3-year interval)","Minimal cross-referencing to external regulations (CAR 38(3) and CAO 100.54) for applicability only","No exceptions, exemptions, or conditional logic","Document contains only one substantive requirement"],"plain_english_summary":"This is a safety directive for **thermal airships** (steerable hot air aircraft, sometimes called \"hot air blimps\"). Think of them as hot air balloons with an engine and rudder for steering.\n\n**What you must do:**\n- Calibrate all flight instruments (altimeters, temperature gauges, pressure sensors, etc.) so they read accurately\n- Follow the manufacturer's specific instructions for these checks\n\n**Who this applies to:**\n- All thermal airships that **don't** have a special approved maintenance system already registered with aviation authorities\n\n**How often:**\n- At least once every three years\n\n**Why this exists:**\nNormally, major inspections would catch instrument drift, but these airships are maintained under a specific regulation (CAO 100.54) that doesn't require those major overhauls. This rule plugs that gap so instruments don't go unchecked for years, keeping flight data accurate and passengers safe."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bal-9-amdt-1-instruments-in-thermal-airships","history":"/api/acts/ad-bal-9-amdt-1-instruments-in-thermal-airships/history","analysis":"/api/acts/ad-bal-9-amdt-1-instruments-in-thermal-airships/analysis","conflicts":"/api/acts/ad-bal-9-amdt-1-instruments-in-thermal-airships/conflicts","importantCases":"/api/acts/ad-bal-9-amdt-1-instruments-in-thermal-airships/important-cases","documents":"/api/acts/ad-bal-9-amdt-1-instruments-in-thermal-airships/documents"}}