What indication signals that the APU is ready for use?

What indication signals that the APU is ready for use?

• A. A red light illuminates on the cockpit display
• B. A green "APU Ready" light illuminates on the cockpit display
• C. A blue "System Active" light appears in the cockpit
• D. A yellow warning light flashes intermittently

Answer: (B)

The indication that signals the APU is ready for use is the illumination of a green "APU Ready" light on the cockpit display. This green light serves as a clear and specific signal to the crew that the APU has completed its start sequence and is functioning properly, making it available for use to provide electrical power and bleed air as needed. In aviation systems, green lights generally indicate normal operations, safety, and readiness, contrasting with the red and yellow indicators which usually signify warnings or cautionary states. Therefore, the green "APU Ready" light is critical for confirming that the APU is fully operational and that the crew can proceed with using it without concern for immediate issues.

The indication that signals the APU is ready for use is the illumination of a green "APU Ready" light on the cockpit display. This green light serves as a clear and specific signal to the crew that the APU has completed its start sequence and is functioning properly, making it available for use to provide electrical power and bleed air as needed.

In aviation systems, green lights generally indicate normal operations, safety, and readiness, contrasting with the red and yellow indicators which usually signify warnings or cautionary states. Therefore, the green "APU Ready" light is critical for confirming that the APU is fully operational and that the crew can proceed with using it without concern for immediate issues.