What is the EGT range for continuous full load APU operation?

The EGT (Exhaust Gas Temperature) range for continuous full load operation of the APU is critical for ensuring the safe and efficient functioning of the unit. The correct range of 600°C to 691°C indicates the optimal temperatures at which the APU can operate under maximum load without risking damage to the components. Operating within this range helps maintain performance while avoiding excessive wear or thermal stress on the engine.

Each of the other ranges provided does not accurately reflect the safe operating conditions for a full-load APU. For example, the range that extends beyond 691°C would likely lead to overheating, which can cause malfunctions or shorten the lifespan of the APU components. Expressions of lower temperatures also indicate partial or no-load operations, which do not align with full load operation requirements and could mislead about the operational safety limits.