{"id":"F2014L01041","name":"CASA 159/14 - Determination — lowest safe altitude (Qantas Airways Limited)","slug":"casa-159-14-determination-lowest-safe-altitude-qantas-airways-limited","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":92140,"registerId":"commonwealth-F2014L01041-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"CASA 159/14 - Determination — lowest safe altitude (Qantas Airways Limited)","content":"Instrument number CASA 159/14\n\nI, GERARD JOHN CAMPBELL, Executive Manager, Operations Division, a delegate of CASA, make this instrument under subregulation 178 (6) of the Civil Aviation Regulations 1988.\n\n\\[Signed G.J. Campbell\\]\n\nGerard J. Campbell  \nExecutive Manager  \nOperations Division\n\n25 July 2014\n\nDetermination — lowest safe altitude (Qantas Airways Limited)\n\n1 Duration\n\nThis instrument:\n\n(a) commences on 1 August 2014; and\n\n(b) expires at the end of July 2017, as if it had been repealed by another instrument.\n\n2 Application\n\nThis instrument applies to CASA’s determination of a method of calculating the lowest safe altitude by Qantas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\nI 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 en route altitude.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1617},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument remains precisely targeted at its stated purpose—authorising specific lowest safe altitude calculation methods for Qantas Airways. There is no expansion beyond the original intent."},"complexity_factors":["Extremely brief instrument with only 3 operative sections and no interpretation provisions","Refers to external technical methods (Jeppesen MORA, Digital Terrain) without defining their mechanics","Single-operator application limits broader context"],"plain_english_summary":"This determination gives Qantas Airways specific permission to calculate minimum safe flying heights using two alternative database-driven methods, rather than the standard regulatory approach.\n\n**What it does**\nNormally, airlines must follow prescribed methods to calculate the **lowest safe altitude** (the minimum height they can fly to clear terrain and obstacles safely). This instrument authorises Qantas Airways Limited (Aviation Reference Number 216147) to use either:\n\n*   **Jeppesen Grid Minimum Off Route (MORA)** – a pre-calculated grid system from commercial navigation charts, or\n*   **Digital Terrain method** – a computer-based system using digital elevation data\n\n**Who it affects**\nOnly Qantas Airways. The permission does not extend to other airlines or operators.\n\n**Why it matters**\nIt provides operational flexibility for flight planning, allowing Qantas to use modern, automated terrain clearance calculations instead of traditional manual methods. The permission was time-limited, operating from August 2014 to July 2017."}},"importantCases":[],"_links":{"self":"/api/acts/casa-159-14-determination-lowest-safe-altitude-qantas-airways-limited","history":"/api/acts/casa-159-14-determination-lowest-safe-altitude-qantas-airways-limited/history","analysis":"/api/acts/casa-159-14-determination-lowest-safe-altitude-qantas-airways-limited/analysis","conflicts":"/api/acts/casa-159-14-determination-lowest-safe-altitude-qantas-airways-limited/conflicts","importantCases":"/api/acts/casa-159-14-determination-lowest-safe-altitude-qantas-airways-limited/important-cases","documents":"/api/acts/casa-159-14-determination-lowest-safe-altitude-qantas-airways-limited/documents"}}