2.4En Route Flight Paths
2.4.1 For aeroplanes for which ETOPS approval is required, the flight path, range performance and fuel flow shall be determined at each weight, altitude and temperature within the operating limits established for the aeroplane. The flight path and range performance shall be determined for each selected configuration with:
the most unfavourable centre of gravity;
the critical engine inoperative;
the remaining engine at the available maximum continuous power or thrust;
the means for controlling the engine supplied air-conditioned air to ensure a reasonable cabin temperature; and
- consideration of the effects of icing on single engine performance.
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