What should be done if battery voltage is less than 21.0 V?

When battery voltage drops below 21.0 V, it signals a potential issue with the electrical system that needs to be documented for maintenance review. Writing it up in the eAML (Electronic Aircraft Maintenance Log) in Flightview serves multiple purposes.

First, it ensures that the maintenance team is alerted to the problem, allowing them to take appropriate action before the aircraft is used for subsequent flights. This is crucial for the safety and readiness of the aircraft. Additionally, it creates a formal record for compliance and future reference, which is essential in aviation operations.

While it may be tempting to consider other actions like powering up the system or continuing the flight, doing so without addressing the battery voltage concern could lead to more significant issues during flight operations. Disconnecting the batteries might not be practical or necessary in most situations, as the focus should be on documenting the situation rather than taking drastic measures.