If the APU EGT reads 807C, which color-coded condition is indicated?

• A. Green
• B. Red
• C. Amber
• D. Blue

Answer: (B)

The key idea here is how the APU EGT gauge uses color to show safety margins. Green means normal operation within limits, amber indicates high temperature but still within an acceptable range under certain conditions, and red flags an over-temperature condition that exceeds safe limits. An EGT of 807°C is well into the red zone for most APUs, meaning it’s above the allowable maximum. That red indication tells you there’s an over-temperature condition and action is required, typically to shut the APU down and follow the standard shutdown procedures. Blue isn’t used for this EGT indication, so it wouldn’t be expected in this context.