TM 1-1680-354-10
o.
Distress Marker SDU-5/E Light (Strobe Light). The distress marker light (See Figure 2-22) is a battery powered,
high intensity sequenced light (strobe light). The light can be seen for 5 miles (8 km) at night and will operate for
9 continuous hours or 18 intermittent hours on the same battery. It has 3 spare batteries.
To operate the light, proceed as follows:
(1)
Make certain the battery is screwed in tightly.
(2)
Push the PUSH ON/OFF rubber switch housing in until a "click" is heard, then release. The light will begin
flashing (50-60 times per minute) within a few seconds.
NOTE
Optimum operating temperature is 70 degrees F. (20 degrees C). Lower temperatures will
result in lower flash rates.
Figure 2-22. Distress Light Signal
2-22 Change 1
