Which color MAINT light on the APU panel indicates an APU maintenance problem?

Which color MAINT light on the APU panel indicates an APU maintenance problem?

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

Answer: (A)

The MAINT light is specifically a maintenance indicator, signaling that the APU requires service or inspection rather than indicating normal operation. The blue color is used to mark that a maintenance action is due or has been logged, so it stands out from the normal-running indicators. Interpreting the other colors helps: green typically means normal operation or that the system is ready, amber usually signals a warning or fault that needs corrective action, and white is often used for status or non-urgent notifications. Since the question is about a maintenance condition, blue is the color that best fits that purpose.

The MAINT light is specifically a maintenance indicator, signaling that the APU requires service or inspection rather than indicating normal operation. The blue color is used to mark that a maintenance action is due or has been logged, so it stands out from the normal-running indicators.

Interpreting the other colors helps: green typically means normal operation or that the system is ready, amber usually signals a warning or fault that needs corrective action, and white is often used for status or non-urgent notifications. Since the question is about a maintenance condition, blue is the color that best fits that purpose.