SDZ Construction: Anti-Tank Rockets (AT-4)

1. SDZ Construction:Anti-Tank Rockets (AT-4) Inter-service Resident Range Safety Course (Intermediate)

2. The AT-4 The AT-4 is a lightweight anti-tank weapon used primarily by infantry forces for engagement and defeat of light armor. August 2003

3. 84mm HEAT cartridge August 2003

4. Legend for the AT-4 August 2003

5. Constructing an SDZ for the AT-4 • Construct an SDZ for the AT-4 firing the 84mm HEAT M136 rocket. • Map Scale: 1:25,000. • Dimensions of the SDZ for this weapon system are given in DA-PAM 385-63, Chapter 8, Table 8-4 and Figures 8-4 and 8-5. • First, plot the firing point, target, and rocket target line. August 2003

6. Plot the firing point. • Plot the target. • Draw the Rocket Target Line. August 2003

7. From Table 8-4, find the measurement for Distance X. • Distance X = 2100m Distance X • Annotate Distance X on the legend. August 2003

8. Distance X 5° 5° • For the Dispersion Area, at the firing point, measure with a protractor 5° angles on the right and left of the Rocket Target Line. • Draw tic marks as shown. August 2003

9. Dispersion Area Distance X 5° 5° • From the firing point, draw a line through the tic marks out through Distance X. • This completes the Dispersion Area. August 2003

10. Dispersion Area Distance X 13° 13° • At the firing point, measure 13° with a protractor from the left and right limits of the Dispersion Area to establish the Ricochet Area. • Draw tic marks. August 2003

11. Dispersion Area Distance X 13° 13° • Draw a straight line from the firing point through each tic mark out through Distance X. • From the firing point, scribe an arc between the left and right limits of the Ricochet Area. Use Distance X as the radius. August 2003

12. Dispersion Area Distance X Ricochet Area 13° 13° • This completes the Ricochet Area. • Erase any unnecessary lines. August 2003

13. Dispersion Area Distance X Ricochet Area • This completes the Ricochet Area. • Erase any unnecessary lines. August 2003

14. Dispersion Area Distance X Ricochet Area • From Table 8-4, find the measurement for Area A. • Area A = 227m (ˆ240m) • Lightly draw lines perpendicular to the limits of the Ricochet Area. • At the measurement for Area A, place tic marks on the lines just drawn. August 2003

15. Dispersion Area Distance X Ricochet Area 25° 25° • Draw straight lines through the tic marks just drawn. • At the firing point, measure with a protractor 25° for Area A. • Draw tic marks as shown. August 2003

16. Dispersion Area Distance X Ricochet Area 25° 25° • Draw straight lines through the tic marks just drawn. • From Table 8-4, find the measure-ment for Area B. • Area B = 488m (ˆ500m) August 2003

17. Dispersion Area Dispersion Area Distance X Ricochet Area Ricochet Area 25° 25° • Lightly draw a line that extends the rocket target line from Distance X. • Verify that Distance X is correct and then place a tic mark at the measurement for Area B. August 2003

18. Dispersion Area Dispersion Area Distance X Ricochet Area Ricochet Area 25° 25° • From the firing point, scribe an arc using the measurement for Area B as the radius. • This completes Areas A and B. August 2003

19. Area B Area A Dispersion Area Dispersion Area Distance X Ricochet Area Ricochet Area • Annotate Areas A and B on the legend. • To complete this part of the SDZ, erase all unnecessary lines. August 2003

20. Area B Area A Dispersion Area Dispersion Area Distance X Ricochet Area Ricochet Area • Annotate Areas A and B on the legend. • To complete this part of the SDZ, erase all unnecessary lines. August 2003

21. Area F • Area F is the danger Area to the rear of a weapon system where personnel are endangered by back-blast debris, overpressure, blast, and hazardous impulse noise. • Area F is the 90° angle (45° left and right) of the rearward extension of the rocket target line. August 2003

22. Area F • There are two zones associated with Area F: • The Danger Zone • The Caution Zone August 2003

23. Danger Zone • The Danger Zone is the immediate area to the rear of the firing line. • Danger Zone occupation could result in fatalities or serious casualties including severe burns, eye damage, or permanent hearing loss. • The hazards are base plate fragments, debris, fireball, high noise levels, and overpressure. August 2003

24. Caution Zone • The Caution Zone is an extension of the Primary Danger Zone. • Occupation of this zone could also result in severe casualties due to back blast, debris, high noise levels and possible base plate fragments. • The Primary Danger and Caution Zones may not be modified. August 2003

25. Area B Area A Dispersion Area Dispersion Area Distance X Ricochet Area Ricochet Area Area F (not to scale) • Locate Area F • Draw the components of Area F in detail. August 2003

26. Firing Line Note: Scale for Area F is 1:625 • In Table 8-4, find the Area F depth measurement. • Danger Zone depth = 5 meters • Caution Zone depth = 95 meters • Area F depth = 100 meters • Scale conversion: [x = (a x 1000 ÷ b)] August 2003

27. 5m Firing Line 95m 45° 45° • Draw a line the length of the Area F depth rearward from the firing point along the same line as the rocket target line. • From the firing point, draw two additional lines of the same length; one 45° to the left and one 45° to the right of the line just drawn. August 2003

28. 5m Firing Line 95m 45° 45° • From the firing point, scribe an arc from the left to the right limit of the Danger Zone. Use the 100 meter measurement as the radius. August 2003

29. 5m Firing Line Danger Zone 95m 45° 45° • From the firing point, scribe an arc from the left to the right limit of the Danger Zone. Use the 5 meter measurement as the radius. • This completes the Danger Zone. August 2003

30. 5m Firing Line Danger Zone Caution Zone 95m 45° 45° • The Area below the Danger Zone is the Caution Zone. • This completes Area F. August 2003

31. Legend for the AT-4 August 2003