What would you expect the color to be when a passenger calls from the lavatory?

When a passenger calls from the lavatory, the indicator light on the flight deck or cabin typically illuminates in white. This color coding is standardized across many aircraft, including the CRJ series, to signal specific conditions. The white light indicates a non-emergency situation, such as a request for assistance from a passenger in the lavatory, allowing flight crew members to respond to the need appropriately without the urgency implied by other colors.

The use of other colors in this context typically signifies different scenarios — for instance, red might indicate an emergency or urgent situation that requires immediate attention, while blue may be used for cabin service requests, and green is often associated with general indications of readiness or normal operation. The choice of white for this particular situation helps to avoid confusion and ensures that crew members are aware of the nature of the call when assessing and prioritizing cabin communications.