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FM 6-50, MCWP 3-1.6.23 After a failure to fire, try to fire two additional times. If the weapon still fails to fire, wait 2 minutes from the last attempt to fire and then remove and inspect the primer. a. If the primer is not dented, the fault is in the firing mechanism. Repair the firing mechanism; prime, and then fire the weapon. b. If the primer is dented, the primer is at fault. Replace the primer with another primer and then fire the weapon. c. If the primer fired, the fault is with the propelling charge. Wait 10 minutes (8 minutes after removal and inspection of the primer), open the breech, and remove and dispose of the defective propelling charge. Reload the weapon with a new propelling charge and primer for firing. 31. Unsafe; deflection exceeds left limit by 10 mils. 32. Unsafe; time is 0.4 second less than minimum time. 33. Unsafe, time is 2.0 seconds less than minimum time. 34. List the action taken in the event of misfire on an M109A2/A4 (hot tube, charge 3). After a failure to fire, try to fire two additional times. If the weapon still fails to fire, wait 2 minutes from the last attempt to fire and then remove and inspect the primer. a. If the primer is not dented, the fault is in the firing mechanism. Repair the firing mechanism, prime the weapon, and then fire it within 5 minutes from the time the round was chambered. b. If the primer is dented, the primer is at fault. Replace the primer with another primer and then fire the weapon within 5 minutes from the time the round is chambered. c. If the primer fired, the fault is with the propelling charge. If it is a combat emergency, insert another primer and then try to fire the weapon within 5 minutes from the time the round was chambered. d. If for any reason the projectile is not removed from the tube within 5 minutes of cambering, evacuate all personnel from the weapon and notify explosive ordnance disposal for removal of the projectile. 35. Describe the method for measuring the greatest angle of site to a crest in front of the howitzer and list the four
methods of determining piece-to-crest range. of the bore and direct the movement of the tube until the line of site just clears the highest point on the crest in front of the howitzer. Center the cross-level and pitch-level bubbles, and read the elevation; this is the greatest angle of site. The four methods of determining piece-to-crest range are taping, map measurement, pacing, and estimation.
QUALIFICATION TEST II True and False 1. The XO must compare the safety card minimum QE with the XO’s minimum QE and use the larger. 2. In indirect fire, the safety officer must ensure that the visible portion of the impact area is clear of personnel. 3. The OIC may authorize the firing of all types of ammunition from a firing point, if he ensures that the proper charge is being fired. 4. Before illuminating rounds are fired, the position commander must ensure that the firing of those rounds is authorized on his safety card. 5. The OIC must ensure that range clearance has been obtained before the battery may fire. 6. CHECK FIRING will be commanded only by the plt ldr. 7. Firing will be halted when the range control commands CHECK FIRING. 8. The plt ldr will verify the boresight of each piece prior to firing in each position. 9. Excess powder should be piled as high as possible for burning to prevent spreading of the flames and to reduce the chance of starting a range fire. 10. Because of the great range of the M110A2 howitzer, drift must be considered in the computation of
safety limits prior to the registration. Multiple Choice 11. Verifying the boresight of each weapon is the specific responsibility of the- a. section chief. b. OIC of firing. c. platoon leader. d. OIC of firing and FDO. 12. The FDO has computed a minimum QE of 186 mils and the plt ldr has determined a minimum QE of 195 mils for shell HE and fuzes quick and time. Which QE should be used as the safe minimum QE? a. 186 b. 190 c. 195 d. either 186 or 195 O-5 |