P-385-63 Range Safety Pamphlet Download

10–13. Multiple Launch Rocket System/High Mobility Artillery Rocket System reduced range practice rocket a. Firing conditions for Multiple Launch Rocket System/High Mobility Artillery Rocket System reduced range practice rocket. These are the same as for standard MLRS and HIMARS (see para 10–12a). b. Surface danger zone. (1) MLRS/HIMARS reduced range practice rocket (RRPR) SDZ requirements are given in table 10–10 and figures 10–10, 10–11, 10–12, 10–13, and 10–14. (2) The SDZ consists of an impact area, a target area or target point, a safety fan (for firing point to point and operational area (OPAREA) SDZs only), flight corridors, Exclusion Areas I and II, and Area F. (3) The SDZ impact area is the rectangular area that will contain all but one in one million normally functioning rockets and debris. It is perpendicular to and bisected by the azimuth of fire. (4) Distances W, X, and Y are buffer distances accounting for debris distribution. Applied inward to determine target areas or outward from a single point, these buffers ensure that less than one in one million normally functioning rockets impact outside prescribed safety limits. With regard to the azimuth of fire, Distance X is beyond the target, Distance Y is short of the target, and Distance W is to the flanks of the target. (5) For the point-to-point method, the target box is determined by applying the values found in table 10–10, up range, down range, and laterally from the target location. (6) The safety fan is defined by range and lateral limits within the target area. (7) The flight corridors are areas parallel to the limits of the safety fan that extend from the forward corners of Area F to the far edge of the SDZ impact area. (8) Exclusion Area I is the danger area directly in front of the firing point or OPAREA. This area extends 2,500 m toward the impact area (1:10,000 probability of injury). Based on risk estimates, Exclusion Area I may be reduced, by deviation, to not less than 1,000 m (1:1000 probability of injury) (see fig 10–12). (9) Exclusion Area II is the danger area between the forward limit of Exclusion Area I and the SDZ impact area. Exclusion Area II may be occupied by deviation only, per the criteria for overhead fire described in paragraph 10–12c. (10) Area F is the area immediately to the rear of the launcher or OPAREA. Personnel may be exposed to blast overpressure, fragments, and debris from rocket launch. Area F extends 350 m to each side of the launcher and 400 m to the rear for point to point or firing point safety methods. It extends 400 m to each side of the OPAREA and 40 m to the rear of the OPAREA for OPAREA firing method. Personnel are not authorized to occupy Area F during firing. The NHA extends an additional 300 m past Area F and may only be occupied by mission-essential personnel wearing approved hearing protection. (11) The target selection box (firing point and OPAREA SDZ only) is the set of all points from which a unit may select targets that will generate safe data regardless of where the launcher is within the OPAREA. c. Overhead fire. (1) The RRPR contains the same rocket motor failure potential as the basic rocket. However, because the RRPR does not have an explosive warhead event, the risk of firing over the heads of personnel authorized to occupy the SDZ is less than with the basic practice rocket. (2) To calculate the risk of injury to personnel during overhead fire of RRPR under deviation, use a short round probability of 1 per 10,000 (.0001) firing when a 2,500 m Exclusion Area I is used. If a 1,000 m Exclusion Area I is used, a short round probability of 1 per 1,000 firings should be used. This information should be used in conjunction with personnel density and areas occupied to calculate risk to personnel on a per-shot basis. (3) An evaluation of the RRPR flight corridor is necessary to ensure accurate risk assessment and provide options for improved training and firing flexibility. Two options for assessing probability are as follows: (a) If a 2,500 m Exclusion Area I in front of the launcher is used, a short round probability of 1 per 10,000 firings should be applied. (b) If a 1,000 m Exclusion Area I in front of the launcher is used, a short round probability of 1 per 1,000 firings should be applied. (4) For both options, the short round hazardous debris area to be used for ranges up to 12 km is 300 x 100 m; for ranges from 12.1 km to 15 km, use 100 x 50 m. (5) The calculations in figure 10–15 are provided to assist in determining risk of RRPR overhead fire and should be chosen based on the training mission requirements. (6) These calculations provide for the ability to estimate a reasonable probability of injury(ies) or vehicle damage. They are estimates and assume a certain level of randomness and uniformity. The probabilities are established so that, although grouping of troops could result in multiple injuries, this grouping would also realistically result in a lower overall probability of injury. 128 DA PAM 385–63 • 16 April 2014