ATP-3-09-30 Observed Fires Download
Page 97 of 204
Adjustment of Fire 28 September 2017 ATP 3-09.30 5-13 FIRE FOR EFFECT 5-53. The purpose of area fire is to create the greatest possible effects on the target by covering the target area with dense fire. The type and amount of ammunition requested by the observer depend on the type of target, its posture, and its activity. Fire for effect is entered during an adjust fire mission when a satisfactory adjustment has been obtained; that is, when deviation, range, and HOB (if firing fuze time) have been corrected to provide effects on target. 5-54. Normally, the observer using successive bracketing requests fire for effect once the 100 meter bracket is split. Under certain conditions when the PER of the weapon is 38 meters or larger, an observer is justified in calling for fire for effect when a 200 meter bracket is split. (In this situation, the FDC notifies the observer that the PER is greater than 38 meters.) 5-55. If fuze time is used, the observer requests FUZE TIME after correcting range and deviation but before announcing FIRE FOR EFFECT. With fuze time, the observer does not request fire for effect until the HOB is correct or until the observer can compute the correction that should result in the correct HOB. 5-56. In splitting the 100 meter bracket, the correction is TIME, ADD (or DROP) 50, OVER. If range and HOB are correct (20 meters above the ground), the observer sends FIRE FOR EFFECT, OVER. 5-57. After requesting FUZE TIME, the observer does not send any more range or deviation corrections to the FDC. 5-58. If the observer spots a round with fuze time as a graze burst and there have been no previous airbursts, the correction is UP 40, OVER. 5-59. If the observer spots a round with fuze time as a graze burst and the observer has spotted a previous airburst, the correction is UP 20, OVER. 5-60. If the observer spots an airburst, the correction to achieve a 20 meter HOB and fire for effect should be sent. For example, if the HOB of the last round is 40 meters, the correction is DOWN 20, FIRE FOR EFFECT, OVER. 5-61. Do not fire for effect : From a graze burst. If the correction is greater than DOWN 40. REFINEMENT AND SURVEILLANCE 5-62. The observer should observe the results of the fire for effect and then take whatever action is necessary to complete the mission. Table 5-2 on page 5-14 shows the observer's actions and example transmissions after observing the fire for effect rounds.