What designates the Primary EICAS display in case of a failure?

The correct identification of the Primary Engine Indication and Crew Alerting System (EICAS) display in the event of a failure is significant for ensuring pilots are appropriately informed about aircraft systems. In the PSA Airlines Canadair Regional Jet (CRJ), the Primary EICAS display, when functioning normally, is typically referred to as ED-1. However, in case of a failure of this primary display, the aircraft's systems are designed to automatically switch to the secondary display, which is designated as ED-2.

This system of designation allows for continuity in monitoring engine parameters and alerts to the crew, ensuring they can still access critical information about the aircraft's status, even when the primary display is interrupted. Recognizing the role of the secondary display is crucial for pilots, as it enables them to make informed decisions based on the data presented.

Understanding this design feature is key in the operation of the CRJ, as it represents a fundamental safety mechanism within the aircraft systems architecture.