What is the maximum EGT upon applying load at governed speed?

The maximum exhaust gas temperature (EGT) upon applying load at governed speed is a critical parameter for monitoring the performance and health of the Auxiliary Power Unit (APU). Understanding that this temperature reflects the efficiency and operational limits of the APU, we recognize that the maximum permissible EGT is established to ensure safe and reliable operation. In this case, the correct answer of 746°C is in alignment with technical specifications and performance standards established for the C-5 APU.

Operating the APU at this maximum EGT can indicate that the engine is working at its optimal capacity under a full load scenario. If the temperature exceeds this limit, it could signify potential over-temperature conditions that may lead to engine damage or reduced lifespan. Therefore, knowing that 746°C is the designated threshold allows operators to run the APU efficiently while safeguarding against possible overheating and ensuring the system operates within its designed thermal limits.