Table  4-1.—Pyrotechnic  Pistols  and  Devices  Launched These devices are capable of firing various types of marine signaling devices. Refer to table 4-1. MK 13 MOD 0 MARINE SMOKE AND  ILLUMINATION SIGNAL The Mk 13 Mod 0 (fig. 4-4) is used as a day or night signal by personnel on land or sea. Because of its small size and weight (6.4 ounces), it can be carried in life vests or flight suit pockets and on life rafts. ‘This signal is  especially  adapted  for  use  by  aircrew  personnel downed  at  sea. The  Mk  13  Mod  0  signal  is  a  metal  cylinder approximately 5 inches long and slightly more than 1.5 inches in diameter. It emits orange smoke for day use and red flame for night use. Burning time for each end is about 20 seconds. The protective plastic cap on the flame (night) end is molded so there are three prominent protrusions  or  beads  across  the  face.  You  can  identify this end by the sense of touch. The face of the cap at the smoke (day) end is smooth. A label on the outer surface around  the  whole  body  of  the  signal  further  identifies the smoke (day) and flame (night) ends. This label has instructions  for  its  use. To use the signal, remove the plastic cap from the end of the signal. Flip the pull ring over the signal rim and push downward to break the seal. After the seal is broken, NEVER point the signal toward your face or body. Then, ignite the signal with a quick pull on the ring. Hold the signal firmly at arm’s length and at a 45-degree angle to prevent burns from hot drippings. If you only use one end, douse the signal in water to cool it. Save the other end for later use. MK 79 MOD 0 ILLUMINATION SIGNAL KIT The Mk 79 Mod 0 signal kit (fig. 4-5) consists of a Mk 31 Mod 0 signal projector, a plastic bandoleer that holds seven Mk 80 Mod 0 signals, and an instruction sheet. The  kit  is  used  by  downed  aircrew  personnel  as  a distress  signaling  device.  Because  it  is  small  and lightweight,  personnel  can  carry  it  in  pockets  of  flight suits or in life rafts. The projector aims and fires the signals.  Each  signal  contains  a  single  red  star.  On activation, this star is propelled upward to a height of between  250  and  650  feet.  The  star  burns  for  a minimum of 4 1/2 seconds. To operate the device, you cock the projector firing pin by moving the trigger screw to the bottom of the vertical slot, and slip it to the right so that it catches at the top of the angular slot. After cocking the firing pin, remove  a  signal  from  the  bandoleer  and  mate  the projector with the signal. Now, rotate the projector clockwise until the signal is seated. Hold the projector overhead, pointed at a slight angle away from your body. While  firmly  gripping  the  projector,  fire  the  signal  by slipping the trigger screw to the left, out of the safety slot and into the firing slot. NOTE: This first step is very important because the signal is threaded and screwed into the end of the projector.   If   you   don’t   cock   the   projector   before screwing in the signal, the firing pin could be forced into the  primer  of  the  signal,  possibly  firing  the  signal prematurely. Q1. Q2. Q3. Q4. REVIEW  NUMBER  1 Navy pyrotechnic devices contain what type of material  ? Why   are   dye-marking   devices   classified   as pyrotechnic  devices? When used during the day, what color smoke is emitted from the Mk 13 Mod 0 marine smoke and illumination  signal? What is the burning time for each end of the Mk 13 Mod 0 signal? 4-3