What is indicated by the amber color on the FA indicator panel of the ERJ 175?

The amber color on the Flight Attendant (FA) indicator panel of the ERJ 175 specifically indicates a sterile flight deck. During this phase of flight, which typically occurs during critical phases such as takeoff and landing, the crew is required to minimize communication and distractions in the cabin. This allows the flight attendants to focus on their safety responsibilities and ensure the safety of passengers while the aircraft is in a critical operational environment. Identifying the sterile flight deck status is crucial for maintaining compliance with safety protocols and contributing to the overall safety of the flight.

The other options do not accurately define what the amber color represents on the panel, as emergency situations would likely be indicated with a different signaling system to ensure immediate attention, whereas normal operation and flight in progress would not require a specific indicator color like amber.