{"id":"F2010L02687","name":"CASA 373/10 – Determination – lowest safe altitude","slug":"casa-373-10-determination-lowest-safe-altitude","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84645,"registerId":"commonwealth-F2010L02687-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"CASA 373/10 – Determination – lowest safe altitude","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: Determination — method of determining lowest safe altitude - LSALT\nmeta-generator: Aspose.Words for .NET 20.2\ntitle: CASA 373/10\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nInstrument number CASA 373/10\n\nI, gregory james hood, Executive Manager, CASA Operations Division, a delegate of CASA, make this instrument under subregulation 178 (6) of the Civil Aviation Regulations 1988.\n\n[Signed Greg Hood]\n\nGreg Hood  Executive Manager  CASA Operations Division\n\n27 October 2010\n\nDetermination — lowest safe altitude\n\n1 Duration\n\n This instrument:\n\n(a) commences on the day after it is registered; and\n\n(b) stops having effect at the end of 31 July 2011.\n\n2 Application\n\nThis instrument applies to CASA’s determination of a method of calculating the lowest safe altitude by Qantas Airways Limited, Aviation Reference Number 216147 (the operator).\n\n3 Determination\n\n  I determine that the operator may use either the Jeppesen Grid Minimum Off Route (MORA) method or the Digital Terrain method as a method of calculating the lowest safe enroute altitude.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2319},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument maintains its original narrow scope: a time-limited administrative approval for a single operator (Qantas) to use specified alternative methods for calculating lowest safe altitude. There is no evidence of scope expansion beyond this specific delegation."},"complexity_factors":["Minimal structure: only 3 operative sections with no subsections or schedules","Single discretionary permission ('may use either... or...') granted to one specific entity","No interpretation section, defined terms, or cross-references within the instrument","References to external technical aviation standards (Jeppesen MORA, Digital Terrain) without internal definition"],"plain_english_summary":"This instrument authorises Qantas Airways (ARN 216147) to calculate the lowest safe altitude using two approved alternatives—Jeppesen Grid MORA or a digital terrain method—instead of the standard regulatory formula. It applies only to Qantas, giving operational flexibility while preserving safety; the approval expires automatically on 31 July 2011 unless renewed."}},"importantCases":[],"_links":{"self":"/api/acts/casa-373-10-determination-lowest-safe-altitude","history":"/api/acts/casa-373-10-determination-lowest-safe-altitude/history","analysis":"/api/acts/casa-373-10-determination-lowest-safe-altitude/analysis","conflicts":"/api/acts/casa-373-10-determination-lowest-safe-altitude/conflicts","importantCases":"/api/acts/casa-373-10-determination-lowest-safe-altitude/important-cases","documents":"/api/acts/casa-373-10-determination-lowest-safe-altitude/documents"}}