What does the amber light on the master call panel indicate?

The amber light on the master call panel indicates that there is an activated lavatory smoke detector. This alert is crucial for the safety of everyone on board, as it signals a potential fire hazard in the lavatory area, which could lead to serious safety issues if not addressed promptly. When the smoke detector is activated, the amber light acts as a warning for the flight crew to take immediate action, ensuring that they can respond appropriately to mitigate any potential dangers.

In contrast to this, other potential indicators such as a malfunction in the oxygen system or successful cabin pressurization are represented by different alerts, while a securely closed door will not activate the amber light either. Understanding the specific indicators and what they signify is essential for maintaining safety and ensuring that flight attendants can effectively manage emergencies as they arise.