Why isn't there a checklist for an ED1 failure?

The reason there is no checklist specifically for an ED1 failure is that it is designed to transfer automatically. In the context of aircraft systems, when an ED1 (Engine Display 1) failure occurs, the system is built to seamlessly switch to an alternate display or mode without requiring pilot intervention. This automated process is intended to minimize the workload on the flight crew during critical situations, allowing them to focus on flying the aircraft rather than troubleshooting potentially transient issues.

Checklists are typically reserved for situations that require manual action or decision-making from the flight crew, particularly when it comes to more significant failures that could affect the safety of the flight. Since the ED1 failure does not require such action, a checklist is deemed unnecessary. This streamlined approach enhances both safety and efficiency, reflecting a thoughtful design consideration in aircraft operations.

The other options suggest misunderstandings: checklists are not exclusively for major failures, and while procedures do exist for handling failures, the automatic transfer negates the need for a checklist in this instance. Hence, the absence of a checklist is a reflection of the system's automated safety features.