Which air inflatable retarder (AIR) fin is used on the MK82 bomb?

The air inflatable retarder (AIR) fin utilized on the MK82 bomb is the BSU-49/B. This particular fin is designed to enhance the drag force on the bomb, allowing it to slow down during descent and improve accuracy by extending its time in the air. The BSU-49/B features a streamlined design that, when deployed, stabilizes the bomb and facilitates a controlled descent trajectory.

The other options, while they are types of AIR fins, correspond to different bomb configurations. The BSU-50/B and BSU-51/B are typically used with other munitions such as the GBU series, and the BSU-52/B is also designed for different bomb systems. The distinction between these options illustrates the specialization of each fin type for their associated ordnance, highlighting the necessity of using the appropriate fin for the MK82 to ensure optimal performance and safety.