Figure 2-22. Distress Light Signal

TM-1-1680-354-10
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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

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