What weight category must the CRJ900-D use for instrument approaches?

The CRJ900-D must use Category D for instrument approaches due to specific criteria defined by the FAA for aircraft separation and operational considerations. Category D encompasses aircraft that require a minimum of 4 nautical miles of separation from other aircraft during approaches and landings. This is particularly relevant for the CRJ900-D because it falls within a certain range of speed and configuration that necessitates this separation distance to ensure safety and efficiency in air traffic management.

In addition to the separation requirements, aircraft categorized under Category D generally have higher approach speeds compared to those in lower categories, which is also a factor in determining the correct category for instrument approaches. This ensures that the CRJ900-D can safely navigate the approach phases of flight without compromising operational safety regulations set forth by aviation authorities.