What types of conditions does a D NOTAM cover?

A D NOTAM, which stands for "Differential NOTAM," specifically addresses conditions that affect the airport operations, excluding the airfield conditions. This means it pertains to broader issues impacting the overall operation and facility management at the airport, such as changes in services, alterations to procedures, or other relevant factors that do not pertain directly to the physical state of runways, taxiways, or other airfield conditions.

While other types of notices, such as NOTAMs covering weather conditions, military airspace changes, or aeronautical chart updates, address specific scenarios, they do not fit under the category designated for D NOTAMs. D NOTAMs primarily serve to inform pilots and air traffic about operational or procedural changes that may influence their operations without directly relating to the status or condition of the runways or taxiways.