2003 US Army BRADLEY GUNNERY 503p.pdf - Survival Books

FM 3-22.1C-3. PROCEDURES FOR ZEROING, A3 ONLYZero the Bradley A3 on a level surface. Zero the 25-mm to a target at 1,200 meters andthe coax to a target at 800 meters in front of and at the same elevation as the vehicle.Once the vehicle is zeroed, the vehicle’s computer will remember the zero until someonechanges it or until the system suffers a catastrophic memory loss. The Bradley A3 crewcan save their calculations in vehicle records or commander notes. Then, to avoid havingto boresight and zero again in the future, they can simply verify their calculations beforerange operations.NOTE:If procedures in this manual differ from CTD procedures, follow theCTD procedures.a. Zero IBAS to 25-MM Gun. To zero the gun in the daytime, refer to the A3 zeroscreens on the CTD (Figure C-1).(1) If the crew cannot zero the 25-mm gun within three rounds, notify themaster gunner.(2) Do not press CONTINUE. This would close the 25-mm screen, which would inturn cause the A3 system to move to the next screen during zeroing procedures, leavingthe 25-mm improperly zeroed.1. Use the DVO (preferred) or the TV or FLIR (using FLIR or TV switch on the GHSto select TV or FLIR) for best viewing.2. Select HI MAG (NFOV) using the HI/LO switch on the GHS.3. Center the TAS reticle on the target using the T&E handwheels.4. Range target using the laser range finder, or enter range manually on the GSCP.5. Repeat Step 3 if required.6. Cycle a ghost round.7. Have the commander observe the impact of the round.8. Fire one tracer round at the target.9. Ensure the TAS reticle still aligns with the zero target. Re-aim as needed.10. Press AIM POINT.11. Center the TAS reticle at the impact point using the CHS or the GHS.12. Press CALCULATE.13. To use the new values, press SAVE. Repeat Steps 7 through 14 until you havezeroed the 25-mm gun or until you have fired three rounds.14. Center the TAS reticle on the target using the T&E handwheels.Figure C-1. Steps for zeroing IBAS to 25-mm gun.b. Zero Auxiliary Sight to 25-mm. To verify the zero using the backup sight(AUX), follow the steps shown in Figure C-2. If you cannot align the auxiliary sight tothe 25-mm within two rounds, notify the unit master gunner.C-2