What does a new or replacing NOTAM without the term "APRX" indicate?

A NOTAM (Notice to Airmen) without the term "APRX" generally specifies that it is valid until the time stated in the NOTAM itself. The absence of "APRX," which stands for "approximately," indicates that the time frame for which the NOTAM is applicable is precisely defined and should be taken literally. This provides clarity and specificity to pilots and air traffic personnel regarding the operational changes or conditions that are in effect.

In contrast, "APRX" typically indicates an estimated time, which can lead to ambiguity regarding how long a NOTAM will remain active. Therefore, when a NOTAM is issued without this qualifier, it signifies that the information is current until the specified time, ensuring that users can plan their operations accordingly. This is crucial for maintaining safety and efficiency in air traffic management.