When must a commander inform the local air traffic service unit regarding a potential bird hazard?

The correct response is that a commander must inform the local air traffic service unit whenever a potential bird hazard is observed. This prompt notification is crucial for ensuring safety in the airspace, as bird activity poses significant risks to aircraft during various phases of flight, particularly during takeoff and landing. Immediate communication allows air traffic control to alert other aircraft in the area and take necessary precautions, which can prevent accidents or incidents involving bird strikes.

The emphasis on proactive reporting highlights the importance of maintaining a high state of awareness regarding environmental hazards, which is fundamental in aviation operations. This practice is not just a formality but a vital part of safety management in aviation, helping to protect not only the aircraft but also passengers and crew.

In terms of the other options, waiting until after landing or only reporting strikes would be too late to mitigate risks during flight operations. Similarly, relying solely on the Operations Manual for guidance could lead to inconsistencies in safety reporting, as some scenarios may necessitate immediate action that is not explicitly outlined in the manual.