True or False: The ESIS has no backup battery, either internal or external.

True or False: The ESIS has no backup battery, either internal or external.

• A. True
• B. False
• C. Cannot be determined
• D. Only works if external battery is connected

Answer: (A)

The statement is true; the Electronic Standby Instrument System (ESIS) indeed does not have an internal or external backup battery. This design choice is intentional, as the ESIS relies on the aircraft's primary electrical system to function. Since there are no backup batteries to maintain the ESIS during power outages, the system is dependent on the aircraft's bus for operation. This emphasizes the importance of ensuring that the electrical systems are fully operational, as any failure would directly affect the functionality of the ESIS.

The statement is true; the Electronic Standby Instrument System (ESIS) indeed does not have an internal or external backup battery. This design choice is intentional, as the ESIS relies on the aircraft's primary electrical system to function. Since there are no backup batteries to maintain the ESIS during power outages, the system is dependent on the aircraft's bus for operation. This emphasizes the importance of ensuring that the electrical systems are fully operational, as any failure would directly affect the functionality of the ESIS.