Above what pressure will the pack be considered overpressure?

The correct answer indicates that the pack is considered to be in an overpressure condition when the pressure exceeds 53 psi. This limitation is critical for maintaining safe operational parameters for the aircraft's environmental control systems. Operating at pressures above this threshold can compromise system integrity, leading to potential malfunctions or failures that could impact passenger comfort and cabin conditions.

In the context of the CRJ 200, strict adherence to specified pressure limits, such as the 53 psi threshold, helps ensure that the aircraft's environmental systems operate within their designed parameters. Exceeding this limit can create risks such as overheating or excessive strain on the components, which may lead to a failure of the heating or cooling systems.

Understanding these pressure limits is essential for flight crews, as it aids in effective monitoring and managing of cabin conditions, crucial for passenger safety and comfort during flight operations.