TM 55-1680-316-10
vest pocket. The kit is designed to supplement the Aircraft Seat
Survival Kit. If used properly, the SRU-31/P kit will help you
maintain good physical and mental health until rescued. Each
packet has additional storage space for items which the
crewmember might deem appropriate and necessary for rescue or
survival.
2-44. SDU-5/E DISTRESS MARKER (Figure
2-4; item 1) See Figure 2-6.
When activated, the distress marker light produces an intermittent
flash of light visible from a minimum distance of 5 miles, operating
even when the light is completely submerged in water. The vest is
also provided with a flexible flashguard which may be used to direct
the light beam. The flash guard is equipped with interchangeable
blue and red lenses. The red lens is for transmitting only ultra
violet light while the blue lens colors the flashes so they may be
distinguished from gun fire flashes. The flexible flashguard is
located in the mandatory general packet of the SRU-31/P kit.
2-42
