What distinguishes the day and night ends of the MK-13 flare?

The distinction between the day and night ends of the MK-13 flare is identified by the specific physical characteristics that differentiate the two. For the day end, the flare typically has markings that are designed to be highly visible and recognizable in daylight conditions. These markings assist personnel in quickly identifying the appropriate end to utilize when deployed during the day.

In contrast, the night end of the MK-13 flare is characterized by raised bumps. These bumps serve as tactile indicators, allowing users to identify the night end in low-light or dark conditions, which is crucial for operations where visibility is compromised. This tactile feedback is important for ensuring that the flare is used correctly, maximizing its effectiveness in signaling or illumination.

The unique features of each end enhance usability and safety in aerospace operations, ensuring that personnel can accurately identify and deploy the flare based on the time of day and prevailing environmental conditions.