{"id":"F2006B10810","name":"AD/INST/1 - Gyro Horizon Indicators Power Failure Warning Flag - Modification","slug":"ad-inst-1-gyro-horizon-indicators-power-failure-warning-flag-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56288,"registerId":"commonwealth-F2006B10810-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/1 - Gyro Horizon Indicators Power Failure Warning Flag - 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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Instruments and Automatic Pilots\n\n \n\nAD/INST/1 Gyro Horizon Indicators Power Failure NK\n\nWarning Flag - Modification\n\nApplicability: Sperry Model H-3 Gyro Horizon. Document:  1. Sperry FSB H.3 No. 18; or\n\n2. ANO 107.3.9.3.1.\n\n \n\nCompliance: Before installation in an aircraft.\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1544},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original directive. The scope remains tightly confined to the specific technical modification for a single instrument model, with no evidence of expansion beyond the original safety-critical intent."},"complexity_factors":["Extremely brief instrument (approximately 50 words of substantive content)","Single, clearly identified product applicability (Sperry Model H-3 only)","Simple, unconditional compliance trigger (before installation)","Reliance on external technical documents (Sperry FSB/ANO) for actual implementation details"],"plain_english_summary":"This CASA Airworthiness Directive mandates a safety modification to Sperry Model H‑3 Gyro Horizon Indicators so they display a power‑failure warning flag. Anyone installing this specific instrument must have the modification done before installation, ensuring pilots aren’t misled by a powerless or frozen attitude indication."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-1-gyro-horizon-indicators-power-failure-warning-flag-modification","history":"/api/acts/ad-inst-1-gyro-horizon-indicators-power-failure-warning-flag-modification/history","analysis":"/api/acts/ad-inst-1-gyro-horizon-indicators-power-failure-warning-flag-modification/analysis","conflicts":"/api/acts/ad-inst-1-gyro-horizon-indicators-power-failure-warning-flag-modification/conflicts","importantCases":"/api/acts/ad-inst-1-gyro-horizon-indicators-power-failure-warning-flag-modification/important-cases","documents":"/api/acts/ad-inst-1-gyro-horizon-indicators-power-failure-warning-flag-modification/documents"}}