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Triangular  Hazard  Area
ANSWERS TO REVIEW QUESTIONS - 14270_117

Aerographers Mate, Module 02-Miscellaneous Observations and Codes
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with a "to" or “through” statement (such as "point A to point B"), plot the attack area as follows: Draw  %-nautical-mile-radius  circles  at  both  the beginning and end points in a spray line. Regard the two circles as being two separate attack areas. Draw  two  tangent  lines  connecting  the  circles (one upwind and one downwind). As shown in figure 5-13, the hazard area is plotted by drawing a line representing the chemical downwind direction  from  the  center  of  both  circles,  representing the beginning and ending points of the attack.  Mark  the DHD  on  each  CDD  line.  Usually,  the  DHD  for  a ground-contaminating   agent   is   10   nautical   miles; however, check element ZEBRA-BRAVO and use the DHD provided. Draw two radial lines tangent to each circle using the half-sector angle given in the message (or 30°). Draw lines perpendicular to the CDD lines at the marked DHD to form two triangular areas. Connect the apexes of the two resulting triangular hazard areas between  points  A  and  B,  as  shown  to  complete  the hazard area. The  three  situations  we  have  discussed  represent the basic plots of different hazard areas that could result from a chemical attack. Changes in wind speed and/or wind direction may require a reevaluation of the hazard area boundaries. Reevaluation is normally done by the forecaster  or  the  personnel  in  the  NBC  center,  and  a supplemental  NAV  NBC  3  CHEM  message  is  normally transmitted to cover the new areas. When a reevaluated NBC  message  is  received  with  the  same  attack  serial number  and  date-time  of  the  attack  message  that  has already   been   plotted,   you   should   plot   the   new boundaries over the old hazard boundaries, possibly in a different color, and note the new information alongside the plot. REVIEW  QUESTIONS Q22.  What  are  the  two  types  of  chemical  hazard messages of most concern to Aerographers? Q23. What information is contained in element "PA" of an NBC 3 CHEM message? Q24. What information is contained in element "ZB" of a NAV NBC 3 CHEM message? Q25.  What  would  the  code  "217981"  indicate  in element "ZA" of a NAV NBC 3 CHEM message? Q26. Q27. Q28. How should a chemical hazard area be plotted for  a  Type  "A"  attack  when  the  average  wind speed is 5 knots or less? What information must be obtained from an NBC 3 CHEM message in order to plot a triangular chemical hazard area? When  is  a  double  triangular  chemical  hazard area plotted? SUMMARY There  are  several  different  types  of  messages related to NBC warfare. Various graphic products can be  completed  from  these  messages  for  NBC  planning and  briefing  purposes.  Most  of  these  products  can  be rapidly produced from TESS. In this chapter, we have discussed the terms used to describe various aspects of NBC  warfare  and  discussed  in  detail  the  elements  of NBC  messages  you  are  most  likely  to  encounter.  We also described the manual methods for producing NBC hazard prediction plots. Figure 5-13.—Double-triangular hazard area. Plotted type B-case (c) chemical attack. 5-16







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