In the two-engine flight planning scenario, ISA deviation used?

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Multiple Choice

In the two-engine flight planning scenario, ISA deviation used?

Explanation:
ISA deviation is the difference between actual temperature and the ISA temperature at a given altitude, and it affects air density, engine thrust, and overall performance. In a two-engine flight planning scenario, calculations are typically based on standard atmosphere unless the problem specifies a nonstandard temperature. That means you assume no deviation from ISA, i.e., the deviation is zero. Using a nonzero deviation would imply hotter or colder air than standard and would require adjusting performance and fuel calculations, which isn’t indicated here. Therefore, zero degrees is the appropriate assumption.

ISA deviation is the difference between actual temperature and the ISA temperature at a given altitude, and it affects air density, engine thrust, and overall performance.

In a two-engine flight planning scenario, calculations are typically based on standard atmosphere unless the problem specifies a nonstandard temperature. That means you assume no deviation from ISA, i.e., the deviation is zero. Using a nonzero deviation would imply hotter or colder air than standard and would require adjusting performance and fuel calculations, which isn’t indicated here. Therefore, zero degrees is the appropriate assumption.

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