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

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SDZ Construction: Anti-Tank Rockets (AT-4). Inter-service Resident Range Safety Course (Intermediate). The AT-4. The AT-4 is a lightweight anti-tank weapon used primarily by infantry forces for engagement and defeat of light armor. 84mm HEAT cartridge. Legend for the AT-4.

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

Inter-service Resident Range Safety Course (Intermediate)

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

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

Plot the firing point.
• Plot the target.
• Draw the Rocket Target Line.

August 2003

From Table 8-4, find the measurement for Distance X.

• Distance X =

2100m

Distance X

• Annotate Distance X on the legend.

August 2003

Distance X

• 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

Dispersion

Area

Distance X

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

August 2003

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

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

Dispersion

Area

Distance X

Ricochet

Area

13°

13°

• This completes the Ricochet Area.
• Erase any unnecessary lines.

August 2003

Dispersion

Area

Distance X

Ricochet

Area

• This completes the Ricochet Area.
• Erase any unnecessary lines.

August 2003

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

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

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

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

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

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

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

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

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

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.

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.

August 2003

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

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

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

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

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

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