OH4

OH4 is a designation commonly used in aviation, particularly within the context of the United States Federal Aviation Administration (FAA) and the military, although its specific meaning can vary depending on the context. In the FAA’s system, OH4 typically refers to a specific type of aircraft registration prefix assigned to helicopters. The prefix "OH" stands for "helicopter," while the following number (in this case, "4") indicates a sequential or regional allocation, often tied to a particular state or operational area.

For military aviation, OH4 can sometimes be associated with certain helicopter models or units, though this is less standardized. The designation may appear in military aircraft databases or historical records, particularly for helicopters like the Bell OH-4 Chieftain, a light observation helicopter used by the U.S. Army during the Vietnam War. The Chieftain was a precursor to the AH-1 Cobra attack helicopter and was known for its role in reconnaissance and light attack missions.

In civilian aviation, OH4 may also refer to specific helicopter operators or training programs, though this usage is less common. The exact allocation of OH4 prefixes is managed by the FAA’s Aircraft Registration Office, which assigns them based on factors such as geographic location, aircraft type, and historical precedence.

For further details, aviation enthusiasts or researchers often consult official FAA databases, military aircraft records, or aviation history resources to clarify the exact context of an OH4 designation.