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

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

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August mm HEAT cartridge

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August 2003 Weapon: Ammo Type: Distance X: Area A: Area B: Map Scale: Map Sheet: Map Series: Map Edition: Date: Name: Legend for the AT-4

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August 2003 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 , Chapter 8, Table 8-4 and Figures 8-4 and 8-5. First, plot the firing point, target, and rocket target line.

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

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

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

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

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August 2003 Dispersion Area 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. 13° Distance X

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August 2003 Dispersion Area Draw a straight line from the firing point through each tic mark out through Distance X. 13° 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.

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

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

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August 2003 From Table 8-4, find the measurement for Area A. 227m (ˆ240m) Area A = 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. Dispersion Area Ricochet Area Distance X

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

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

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

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

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

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

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August 2003 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.

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

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August 2003 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.

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August 2003 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.

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

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

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August 2003 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. Draw a line the length of the Area F depth rearward from the firing point along the same line as the rocket target line. Firing Line 45° 95m 5m

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August 2003 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. Firing Line 45° 95m 5m

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August 2003 Firing Line 45° This completes the Danger Zone. Danger Zone 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. 95m 5m

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

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August 2003 Weapon: AT-4 Ammo Type: 84mm HEAT M136 Rocket Distance X: 2100m Area A: 227m (ˆ240m) Area B: 488m (ˆ500m) Primary Danger Zone: 5m Primary Caution Zone: 95m Area F: 100m Map Scale: 1:25,000 Map Sheet: Map Series: Map Edition: Date: Name: Legend for the AT-4

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