Chapter 19

Signaling Techniques

MK-13 and MK-124

19-20. These signals are normally found on aircraft and lift rafts. They produce an orange smoke on one end for day signaling and a flare on the other end for nighttime use. The smoke lasts for approximately 15 seconds and the flare lasts 20 to 25 seconds. Though the signal is designed for use on a life raft, they do not float. They are designed to be handheld, but hold the device by the far end that is not being used to prevent burns. Note that after expending either signal the other end is still available for use, so do not discard it until both ends have been used. There are numerous redundant markings on each side of the flare to ensure that you activate the correct signal, day or night. The end caps are colored, raised protrusions or nipples are present, and a washer is on the pull ring to differentiate night and day.