1. TEAM DRILL #2 81mm M23 MORTAR BALLISTIC COMPUTER BASIC PROCEDURES UNITED STATES ARMY INFANTRY SCHOOL INFANTRY MORTAR LEADER COURSE DELTA COMPANY, 2nd PLATOON, 2/29th INF. REGT. FT. BENNING, GEORGIA 31905 JANUARY 2001 SMW 01

2. DATA SHEET For use of this form, see FM 23-91. The proponent agency is TRADOC. SETUPWEAPON DATAFO DATA UNIT: _____MM CAR YES NO TIME OUT: TGT PREFIX: TGT NO: ALARM ON OFF MIN E: MIN N: BP: FOALTGRID AMMUNITION DATA TEMPERATURE: TYPE: HE WP ILL CS TNG TARGET DATA GD: E W LAT: + - LISTEN: ON OFF BIT RATE KEY TONE BLK SNG DBL OWNER ID: E: N: ALT: AZ: DEF: ELE: WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : LOT# WHEIGHT/ TYPE ON HAND RECEIVED TOTAL ROUNDS EXPENDED ROUNDS REMAINING TARGET IDCHART DATA FIRING CORRECTIONS FIRING DATA INTELLIGENCE ROUND TGT # GRIDALTDEFLRNG /CHG DEFL CORR RNG CORR ALT VI ALT CORR DEFLRNG /CHG F.S. ELETIME FIRED TARGET DESCRIPTION SURVMETHOD OF ENGAGEMENT EXP X A M26 533 9783 / 6411 DA FORM 2188-R SB 0900-099981 XM252 A2 9841 6435 2800 X M821 M375 M301A3 1 XX 60 X 095000 055000 03 X27 X 1200 4.8 X 496 3800 A1 4980 35 A3 1780 35 A4 1780 70 50 Degrees

3. Store the following No Fire Zone and Line in your computer: No Fire Zone #1 / # of points: 6 9771 / 6111 9863 / 6130 9951 / 6120 9960 / 6152 9881 / 6170 9770 / 6179 No Fire Line: Minimum: 9980 / 6125 9531 / 6575 Maximum: 9800 / 6200 ******************************************************************* Due to the tactical situation, the Platoon Leader has decided to conduct split operations. The #3 & #4 guns have moved to grid 9934 / 6405, Alt 550. Enter the #3 gun as the basegun with a mounting azimuth of 4160, and a referred deflection of 2800. #4 guns direction is 2200 and a distance of 35 meters. Clear #3 & #4 out of the computer and make them the Bravo Section. 2

4. COMPUTER’S RECORD For use of this form, see FM 23-91, the proponent agency is TRADOC ORGANIZATIONDATETIMEOBSERVER IDTARGET NUMBER ADJUST FIREFIRE FOR EFFECT IMMEDIATE SUPPRESSION GRID OT DIRECTION ALTITUDE SHIFT FROM: OT DIRECTION:ALTITUDE POLAR: OT DIRECTION ALTITUDE TARGET DESCRIPTION: METHOD OF ENGAGEMENT: METHOD OF CONTROL: MESSAGE TO OBSERVER: FDC ORDER MORT TO FFE INITIAL CHART DATAINITIAL FIRE COMMAND ROUNDS EXPENDED MORT TO ADJ METHOD OF ADJ BASIS FOR CORRECTION SHEAF CORRECTION SHELL & FUSE METHOD OF FFE RANGE LATERAL SPREAD ZONE TIME OF OPENING FIRE DEFLECTION DEFLECTION CORRECTION L R RANGE VI//ALT CORRECTION + - RANGE CORRECTION + - CHARGE / RANGE AZIMUTH ANGLE T MORTAR TO FOLLOW SHELL AND FUSE MORTAR TO FIRE METHOD OF FIRE DEFLECTION CHARGE TIME SETTING ELEVATION LEFT /RIGHT ADD /DROP UP /DOWN OBSERVER CORRECTIONSCHART DATASUBSEQUENT COMMANDS DEV RANGE TIME (HEIGHT) DEFL CHARGE (RANGE) MORT FIRE METHOD FIRE DEFL RANGE / CHARGE TIME SETTING ELEV UP/ DOWN VERTICAL ANGLE + - DISTANCE DA FORM 2399, DEC 91 SITUATION AM 26SB 0900 / KNPT 00 X 9694 / 6296 3870 Inf. Co. occupying positions A & B SEC 1 RD HEQ 3 RDS W / R EOM 30% CASUALTIES 3 480 #3 L200 -200 +50 -25 FFE R50

5. DATA SHEET For use of this form, see FM 23-91. The proponent agency is TRADOC. SETUPWEAPON DATAFO DATA UNIT: _____MM CAR YES NO TIME OUT: TGT PREFIX: TGT NO: ALARM ON OFF MIN E: MIN N: BP: FOALTGRID AMMUNITION DATA TEMPERATURE: TYPE: HE WP ILL CS TNG TARGET DATA GD: E W LAT: + - LISTEN: ON OFF BIT RATE KEY TONE BLK SNG DBL OWNER ID: E: N: ALT: AZ: DEF: ELE: WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : WPN : DIR : DIS : LOT# WHEIGHT/ TYPE ON HAND RECEIVED TOTAL ROUNDS EXPENDED ROUNDS REMAINING TARGET IDCHART DATA FIRING CORRECTIONS FIRING DATA INTELLIGENCE ROUND TGT # GRIDALTDEFLRNG /CHG DEFL CORR RNG CORR ALT VI ALT CORR DEFLRNG /CHG F.S. ELETIME FIRED TARGET DESCRIPTION SURVMETHOD OF ENGAGEMENT EXP X A M26 533 9783 / 6411 DA FORM 2188-R SB 0951-099981 XM252 A2 9864 6533 2800 X M821 M375A2M301A3 4 XX 60 X 095000 055000 03 X27 X 1200 4.8 X 400 3705 A1 5300 35 A3 2100 35 A4 2100 70 60 Degrees Situation: Alpha section has moved to a new location. Use this data sheet to update your MBC. No Fire Zone and Line are still in effect. Bravo section rejoins with Alpha section.

6. COMPUTER’S RECORD For use of this form, see FM 23-91, the proponent agency is TRADOC ORGANIZATIONDATETIMEOBSERVER IDTARGET NUMBER ADJUST FIREFIRE FOR EFFECT IMMEDIATE SUPPRESSION GRID OT DIRECTION ALTITUDE SHIFT FROM: OT DIRECTION:ALTITUDE POLAR: OT DIRECTION ALTITUDE TARGET DESCRIPTION: METHOD OF ENGAGEMENT: METHOD OF CONTROL: MESSAGE TO OBSERVER: FDC ORDER MORT TO FFE INITIAL CHART DATAINITIAL FIRE COMMAND ROUNDS EXPENDED MORT TO ADJ METHOD OF ADJ BASIS FOR CORRECTION SHEAF CORRECTION SHELL & FUSE METHOD OF FFE RANGE LATERAL SPREAD ZONE TIME OF OPENING FIRE DEFLECTION DEFLECTION CORRECTION L R RANGE VI//ALT CORRECTION + - RANGE CORRECTION + - CHARGE / RANGE AZIMUTH ANGLE T MORTAR TO FOLLOW SHELL AND FUSE MORTAR TO FIRE METHOD OF FIRE DEFLECTION CHARGE TIME SETTING ELEVATION LEFT /RIGHT ADD /DROP UP /DOWN OBSERVER CORRECTIONSCHART DATASUBSEQUENT COMMANDS DEV RANGE TIME (HEIGHT) DEFL CHARGE (RANGE) MORT FIRE METHOD FIRE DEFL RANGE / CHARGE TIME SETTING ELEV UP DOWN VERTICAL ANGLE + - DISTANCE DA FORM 2399, DEC 91 SITUATION BM 26SB 0951 / KNPT 51 X P.I.O. 100x200 ATT: 3820 SEC #2 1 RD HEQ W / R L100 -25 EOM 10% Casualties 5 Vehicles Destroyed 5 SB 0900 3870 X50 X 400 R50 FFE SEC Search Down ________ Turns Center Mass Data____________________ Method of FFE was left blank for you to fill in.

7. SEARCH MISSION NOTES NOTE: In the FFE, the correct starting point for the section must be determined before going into the ADJ menu. 1. Compute firing data to center mass of the target area. Last correction the FO sends. Record Burst Point:______________________ Deflection:_____________________________ Range:________________________________ NOTE: Determine firing data to the far edge of the target area first. 2. Enter Adjust menu first, sequence to DIR, clear the display and enter target attitude. Then sequence to +/- range and enter the correction to the far edge. Record the firing data. Correction in meters to the far edge:___________________ Charge to the far edge:_____________________________ Elevation to the far edge:____________________________ 3. Enter the Adjust menu, enter a correction to the near edge of the target area. Record data. Correction in meters to the near edge:__________________ Charge to the near edge:_____________________________ Elevation to the near edge:___________________________ NOTE: The charge for the near edge and far edge of the target area must be the same. If the charge is the same, go to step 5. 4. If the charges are different, enter WPN/AMMO menu and select the lowest charge possible that will cover the target area to be searched. (Far edge charge.) Compute and record data. Near edge Charge:_____________________ Near edge Elevation:___________________ Far edge Charge:______________________ Far edge Elevation:____________________ NOTE: If searching up, the far edge becomes the firing data. If searching down, the near edge becomes the firing data. 5. Determine the MIL difference between near edge and far edge elevations. Near edge Elevation:___________________ Far edge Elevation:____________________ 6. Divide the MIL difference by 10. (Number of MILS 1 turn of elevation handwheel equals.) ______MILS divided by 10 = _________turn(s)=turn(s)_______determined to the nearest whole turn. 6

8. SEARCH MISSION NOTES (CONTINUED) 7. Determine number of rounds to cover area. 100 mtrs=4 rounds 50 mtrs=2 rounds 30 mtrs=1 round Length of target___________meters=__________rounds in FFE. 8. Determine the number of intervals by subtracting 1 from the number of rounds. ________rounds - 1=________intervals 9. Divide number of turns by the number of intervals equal number of turns to search. _______intervals divided into _______turn(s) = _______turn(s) between rounds (determined to the nearest half turn). 10. Before ending mission, place adjusting gun on center mass data. Enter the Adjust Menu, enter correction to center mass. Sequence to ready and compute. Enter safety data menu, sequence to the burst point grid and record data. Burst Point Grid:_____________________ (should be the same as in step 1) 11. Enter the EOM menu and save as KNPT. 7

9. COMPUTER’S RECORD For use of this form, see FM 23-91, the proponent agency is TRADOC ORGANIZATIONDATETIMEOBSERVER IDTARGET NUMBER ADJUST FIREFIRE FOR EFFECT IMMEDIATE SUPPRESSION GRID OT DIRECTION ALTITUDE SHIFT FROM: OT DIRECTION:ALTITUDE POLAR: OT DIRECTION ALTITUDE TARGET DESCRIPTION: METHOD OF ENGAGEMENT: METHOD OF CONTROL: MESSAGE TO OBSERVER: FDC ORDER MORT TO FFE INITIAL CHART DATAINITIAL FIRE COMMAND ROUNDS EXPENDED MORT TO ADJ METHOD OF ADJ BASIS FOR CORRECTION SHEAF CORRECTION SHELL & FUSE METHOD OF FFE RANGE LATERAL SPREAD ZONE TIME OF OPENING FIRE DEFLECTION DEFLECTION CORRECTION L R RANGE VI//ALT CORRECTION + - RANGE CORRECTION + - CHARGE / RANGE AZIMUTH ANGLE T MORTAR TO FOLLOW SHELL AND FUSE MORTAR TO FIRE METHOD OF FIRE DEFLECTION CHARGE TIME SETTING ELEVATION LEFT /RIGHT ADD /DROP UP /DOWN OBSERVER CORRECTIONSCHART DATASUBSEQUENT COMMANDS DEV RANGE TIME (HEIGHT) DEFL CHARGE (RANGE) MORT FIRE METHOD FIRE DEFL RANGE / CHARGE TIME SETTING ELEV UP DOWN VERTICAL ANGLE + - DISTANCE DA FORM 2399, DEC 91 SITUATION CM 26SB 0952 / KNPT 52 X Co. Defensive Perimeter 450x50 ATT: 2200 SEC #2 1 RD HEQ W / R R25 +200 EOM EST. 50% CASUALTIES 8 9720 / 6410 3400 Spec 450W -100 -25 FFE PREPARE TO TRAVERSE LEFT SEC Traverse Left ______ Turn(s) Method of FFE was left blank for you to fill in.

10. TRAVERSE MISSION NOTES In the FFE, the correct starting point for each gun is found by entering a modified correction in the Adjust menu. This must be done before going into the TFC menu. 1. Compute the firing data to the center of mass of the target, (last correction the observer sends), record the burst point grid and the gun target azimuth. Burst point grid:____________________ Gun target azimuth:_________________ Range:___________________________ 2. Determine the segment width of each gun by dividing the width of the target area by the number of guns in the section. Width of target divided by guns=_______________meters for one segment. 3. Divide segment width in half to determine the amount of modification. One segment divided by 2 =_______________modified correction. 4. Use the traverse mission formula (p. 23) to determine the direction (+ or -) of the modification. Modification direction: + or - (circle one) 5. Enter the Adjust menu; sequence to dir; clear the direction displayed and enter the target attitude; sequence to RN; enter modification correction; sequence to ready. 6. Enter TFC menu and change MOE: PRL to Special; select adjusting point center; WID_______ meters; sequence to ATT; enter target attitude______; change CON: AF to FFE; sequence to ready and compute. Record firing data. Determine the number of rounds to cover area 7. For each 100 meters=4 rounds 50 meters=2 rounds 30 meters=1 round Target width___________divided by number of guns=_________meters for one segment. One segment__________meters=___________rounds in the Method of FFE. Determine the number of turns of traverse 8. Determine mil width for one segment by subtracting #2 gun’s deflection from #1 gun’s deflection. Divide remainder by 10 (# of mils for one turn of traversing handwheel) to determine the number of turns to cover one segment. Determine the number of intervals by subtracting 1 from the number of rounds for one segment. Divide the number of turns by the number of intervals equal number of turn(s) to traverse. Number of rounds for one gun in the FFE=_________ (Step 7) Mil width for one segment=___________mils Mil difference for one segment_________divided by 10=_________=________turn(s) (Determine to nearest whole #) ____rounds - 1 = ________intervals=____intervals divided into _____turn(s)=____turn(s) between rounds (Determine to the nearest half turn) 9

11. TRAVERSE MISSION NOTES (CONTINUED) 9. Place adjusting gun back on center mass data prior to ending mission. Step 1: Enter TFC menu, change SPC to PRL, change FFE to AF. Step 2: Enter ADJ menu, reverse the modification direction (+ or -), sequence to ready and compute. Enter safety data menu to burst point. Record Burst Point Grid:_________________________ (Should be the same grid as in Step 1.) 10. Enter the EOM menu to EOMRAT, save as KNPT TRAVERSE MISSION FORMULA GUN TARGET AZIMUTH 4901 - 1499 TRAVERSE LEFT (+) TRAVERSE RIGHT (-) GUN TARGET AZIMUTH 1500 - 1700 ATTITUDE<1600 TRAVERSE LEFT (-) TRAVERSE RIGHT (+) ATTITUDE>1600 TRAVERSE LEFT (+) TRAVERSE RIGHT (-) GUN TARGET AZIMUTH 1701 - 4699 TRAVERSE LEFT (-) TRAVERSE RIGHT (+) GUN TARGET AZIMUTH 4700-4900 ATTITUDE<1600 TRAVERSE LEFT (+) TRAVERSE RIGHT (-) ATTITUDE>1600 TRAVERSE LEFT (-) TRAVERSE RIGHT (+) NOTE: Attitudes can not be greater than 3200 mils. The difference between gun attitude and target attitude must not exceed 100 Mils. 10

12. TEAM DRILL #2 SOLUTIONS 81mm M23 MORTAR BALLISTIC COMPUTER BASIC PROCEDURES UNITED STATES ARMY INFANTRY SCHOOL INFANTRY MORTAR LEADER COURSE DELTA COMPANY, 2nd PLATOON, 2/29th INF. REGT. FT. BENNING, GEORGIA 31905 JANUARY 2001 SMW 01

13. COMPUTER’S RECORD For use of this form, see FM 23-91, the proponent agency is TRADOC ORGANIZATIONDATETIMEOBSERVER IDTARGET NUMBER ADJUST FIREFIRE FOR EFFECT IMMEDIATE SUPPRESSION GRID OT DIRECTION ALTITUDE SHIFT FROM: OT DIRECTION:ALTITUDE POLAR: OT DIRECTION ALTITUDE TARGET DESCRIPTION: METHOD OF ENGAGEMENT: METHOD OF CONTROL: MESSAGE TO OBSERVER: FDC ORDER MORT TO FFE INITIAL CHART DATAINITIAL FIRE COMMAND ROUNDS EXPENDED MORT TO ADJ METHOD OF ADJ BASIS FOR CORRECTION SHEAF CORRECTION SHELL & FUSE METHOD OF FFE RANGE LATERAL SPREAD ZONE TIME OF OPENING FIRE DEFLECTION DEFLECTION CORRECTION L R RANGE VI//ALT CORRECTION + - RANGE CORRECTION + - CHARGE / RANGE AZIMUTH ANGLE T MORTAR TO FOLLOW SHELL AND FUSE MORTAR TO FIRE METHOD OF FIRE DEFLECTION CHARGE TIME SETTING ELEVATION LEFT /RIGHT ADD /DROP UP /DOWN OBSERVER CORRECTIONSCHART DATASUBSEQUENT COMMANDS DEV RANGE TIME (HEIGHT) DEFL CHARGE (RANGE) MORT FIRE METHOD FIRE DEFL RANGE / CHARGE TIME SETTING ELEV UP/ DOWN VERTICAL ANGLE + - DISTANCE 3 RDS I/FFE DA FORM 2399, DEC 91 SITUATION AM 26SB 0900 / KNPT 00 X 9694 / 6296 3870 Inf. Co. occupying positions A & B SEC 1 RD HEQ 3 RDS W / R EOM 30% CASUALTIES 1 480 #3 L200 -200 +50 -25 FFE R50 ANGLE T: 500 2636 4366 500 #3 & #4 HEQ #3 1 RD I/ADJ 2596 2 1149 1 2367 2632 1207 2 2433 2623 1193 3 2411 A & B 3 RDS #3/#4 2618 1198 #1/#2 2641 1 1038 15 BP: 97166 63007 To determine firing data for the A section: EOMRAT B section and save as KNPT 00. Activate a shift from KNPT 00, sequence to DIR, select GT, sequence through, making no corrections. Enter WPN/AMMO, sequence through and enter A2 and compute. Record Data and EOM shift mission.

14. COMPUTER’S RECORD For use of this form, see FM 23-91, the proponent agency is TRADOC ORGANIZATIONDATETIMEOBSERVER IDTARGET NUMBER ADJUST FIREFIRE FOR EFFECT IMMEDIATE SUPPRESSION GRID OT DIRECTION ALTITUDE SHIFT FROM: OT DIRECTION:ALTITUDE POLAR: OT DIRECTION ALTITUDE TARGET DESCRIPTION: METHOD OF ENGAGEMENT: METHOD OF CONTROL: MESSAGE TO OBSERVER: FDC ORDER MORT TO FFE INITIAL CHART DATAINITIAL FIRE COMMAND ROUNDS EXPENDED MORT TO ADJ METHOD OF ADJ BASIS FOR CORRECTION SHEAF CORRECTION SHELL & FUSE METHOD OF FFE RANGE LATERAL SPREAD ZONE TIME OF OPENING FIRE DEFLECTION DEFLECTION CORRECTION L R RANGE VI//ALT CORRECTION + - RANGE CORRECTION + - CHARGE / RANGE AZIMUTH ANGLE T MORTAR TO FOLLOW SHELL AND FUSE MORTAR TO FIRE METHOD OF FIRE DEFLECTION CHARGE TIME SETTING ELEVATION LEFT /RIGHT ADD /DROP UP /DOWN OBSERVER CORRECTIONSCHART DATASUBSEQUENT COMMANDS DEV RANGE TIME (HEIGHT) DEFL CHARGE (RANGE) MORT FIRE METHOD FIRE DEFL RANGE / CHARGE TIME SETTING ELEV UP DOWN VERTICAL ANGLE + - DISTANCE 1 RD I/ADJ 1199 DA FORM 2399, DEC 91 SITUATION BM 26SB 0951 / KNPT 51 X P.I.O. 100x200 ATT: 3820 SEC #2 1 RD HEQ W / R L100 -25 EOM 10% Casualties 5 Vehicles Destroyed 2 SB 0900 3870 X50 X 400 R50 FFE SEC Search Down ________ Turn(s) Center Mass Data_____________ 2359 3739 100 SEC HEQ #2 8 RDS I/FFE 8 RDS 2770 2 1 2349 2814 1200 2 22428 RDS1/2 2792 1223 34 97504 / 63283 Far edge elevation=1181 Near edge elevation=1223 1223 - 1181=42 42 divided by 10=4.2 or 4 turns Turns between rounds: 8 rounds -1=7 intervals 4 divided by 7 =0.5 or 1/2 turn Use start point range and elevation along with center mass deflection to fire mission. Record center mass burst point data for data sheet; KNPT 51.

15. SEARCH MISSION NOTES NOTE: In the FFE, the correct starting point for the section must be determined before going into the ADJ menu. 1. Compute firing data to center mass of the target area. Last correction the FO sends. Record Burst Point:______________________ Deflection:_____________________________ Range:________________________________ NOTE: Determine firing data to the far edge of the target area first. 2. Enter Adjust menu first, sequence to DIR, clear the display and enter target attitude. Then sequence to +/- range and enter the correction to the far edge. Record the firing data. Correction in meters to the far edge:___________________ Charge to the far edge:_____________________________ Elevation to the far edge:____________________________ 3. Enter the Adjust menu, enter a correction to the near edge of the target area. Record data. Correction in meters to the near edge:__________________ Charge to the near edge:_____________________________ Elevation to the near edge:___________________________ NOTE: The charge for the near edge and far edge of the target area must be the same. If the charge is the same, go to step 5. 4. If the charges are different, enter WPN/AMMO menu and select the lowest charge possible that will cover the target area to be searched. (Far edge charge.) Compute and record data. Near edge Charge:_____________________ Near edge Elevation:___________________ Far edge Charge:______________________ Far edge Elevation:____________________ NOTE: If searching up, the far edge becomes the firing data. If searching down, the near edge becomes the firing data. 5. Determine the MIL difference between near edge and far edge elevations. Near edge Elevation:___________________ Far edge Elevation:____________________ = ______________mils between edges. 3 97504 / 63283 2792 2341 +100 2 1181 -200 2 1223 1181 42

16. SEARCH MISSION NOTES (CONTINUED) 6. Divide the MIL difference by 10. (Number of MILS 1 turn of elevation handwheel equals.) ______MILS divided by 10 = _________turn(s)=turn(s)_______(determined to the nearest whole turn.) 7. Determine number of rounds to cover area. 100 mtrs=4 rounds 50 mtrs=2 rounds 30 mtrs=1 round Length of target___________meters=__________rounds in FFE. 8. Determine the number of intervals by subtracting 1 from the number of rounds. ________rounds - 1=________intervals 9. Divide number of turns by the number of intervals equal number of turns to search. _______intervals divided into _______turn(s) = _______turn(s) between rounds (determined to the nearest half turn). 10. Before ending mission, place adjusting gun on center mass data. Enter the Adjust Menu, enter correction to center mass. Sequence to ready and compute. Enter safety data menu, sequence to the burst point grid and record data. Burst Point Grid:_____________________ (should be the same as in step 1) 11. Enter the EOM menu and save as KNPT. 4 424.24 200 8 8 7 7 4.57 = 1/2 97504 / 63283

17. COMPUTER’S RECORD For use of this form, see FM 23-91, the proponent agency is TRADOC ORGANIZATIONDATETIMEOBSERVER IDTARGET NUMBER ADJUST FIREFIRE FOR EFFECT IMMEDIATE SUPPRESSION GRID OT DIRECTION ALTITUDE SHIFT FROM: OT DIRECTION:ALTITUDE POLAR: OT DIRECTION ALTITUDE TARGET DESCRIPTION: METHOD OF ENGAGEMENT: METHOD OF CONTROL: MESSAGE TO OBSERVER: FDC ORDER MORT TO FFE INITIAL CHART DATAINITIAL FIRE COMMAND ROUNDS EXPENDED MORT TO ADJ METHOD OF ADJ BASIS FOR CORRECTION SHEAF CORRECTION SHELL & FUSE METHOD OF FFE RANGE LATERAL SPREAD ZONE TIME OF OPENING FIRE DEFLECTION DEFLECTION CORRECTION L R RANGE VI//ALT CORRECTION + - RANGE CORRECTION + - CHARGE / RANGE AZIMUTH ANGLE T MORTAR TO FOLLOW SHELL AND FUSE MORTAR TO FIRE METHOD OF FIRE DEFLECTION CHARGE TIME SETTING ELEVATION LEFT /RIGHT ADD /DROP UP /DOWN OBSERVER CORRECTIONSCHART DATASUBSEQUENT COMMANDS DEV RANGE TIME (HEIGHT) DEFL CHARGE (RANGE) MORT FIRE METHOD FIRE DEFL RANGE / CHARGE TIME SETTING ELEV UP DOWN VERTICAL ANGLE + - DISTANCE ANGLE T: 700 1894 DA FORM 2399, DEC 91 SITUATION CM 26SB 0952 / KNPT 52 X Co. Defensive Perimeter 450x50 ATT: 2200 SEC #2 1 RD HEQ W / R R25 +200 EOM EST. 50% CASUALTIES 5 9720 / 6410 3400 Spec 450W -100 -25 FFE PREPARE TO TRAVERSE LEFT SEC Traverse Left ______ Turn(s) Method of FFE was left blank for you to fill in. SEC HEQ #2 1 RD I/ADJ 5 RDS I/FFE 5 RDS 700 2427 1 1000 1 2070 2479 2 1262 2 1989 2448 1 0928 3 1968 5 RDS1 #1 2345 0893 #2 2383 0919 #3 2423 0936 #4 2462 0951 23 Range recorded is center mass. #2 Defl: 2383 - #1 Defl 2345 = 38 divided by 10 = 3.8=4 turns Turns between rds - 5 rds = 4 Int= 4 divided by 4 = 1 turn 4080

18. TRAVERSE MISSION NOTES In the FFE, the correct starting point for each gun is found by entering a modified correction in the Adjust menu. This must be done before going into the TFC menu. 1. Compute the firing data to the center of mass of the target, (last correction the observer sends), record the burst point grid and the gun target azimuth. Burst point grid:____________________ Gun target azimuth:_________________ Range:___________________________ 2. Determine the segment width of each gun by dividing the width of the target area by the number of guns in the section. Width of target divided by guns=_______________meters for one segment. 3. Divide segment width in half to determine the amount of modification. One segment divided by 2 =_______________modified correction. 4. Use the traverse mission formula (p. 23) to determine the direction (+ or -) of the modification. Modification direction: + or - (circle one) 5. Enter the Adjust menu; sequence to dir; clear the direction displayed and enter the target attitude; sequence to RN; enter modification correction______; sequence to ready. 6. Enter TFC menu and change MOE: PRL to Special; select adjusting point center; WID_______ meters; sequence to ATT; enter target attitude______; change CON: AF to FFE; sequence to ready and compute. Record firing data. Determine the number of rounds to cover area 7. For each 100 meters=4 rounds 50 meters=2 rounds 30 meters=1 round Target width___________divided by number of guns=_________meters for one segment. One segment__________meters=___________rounds in the Method of FFE. Determine the number of turns of traverse 8. Determine mil width for one segment by subtracting #2 gun’s deflection from #1 gun’s deflection. Divide remainder by 10 (# of mils for one turn of traversing handwheel) to determine the number of turns to cover one segment. Determine the number of intervals by subtracting 1 from the number of rounds for one segment. Divide the number of turns by the number of intervals equal number of turn(s) to traverse. Number of rounds for one gun in the FFE=_________ (Step 7) Mil width for one segment=___________mils Mil difference for one segment_________divided by 10=_________=________turn(s) (Determine to nearest whole #) ____rounds - 1 = ________intervals=____intervals divided into _____turn(s)=____turn(s) between rounds (Determine to the nearest half turn) 6 97161 / 64031 4066 1968 112.6 =113 56.7 = 57 (Traverse Left) 57 450 2200 450 113 113 5 5 38 38 3.8 4 5 4 4 4 1

19. TRAVERSE MISSION NOTES (CONTINUED) 9. Place adjusting gun back on center mass data prior to ending mission. Step 1: Enter TFC menu, change SPC to PRL, change FFE to AF. Step 2: Enter ADJ menu, reverse the modification direction (+ or -), sequence to ready and compute. Enter safety data menu to burst point. Record Burst Point Grid:_________________________ (Should be the same grid as in Step 1.) 10. Enter the EOM menu to EOMRAT, save as KNPT TRAVERSE MISSION FORMULA GUN TARGET AZIMUTH 4901 - 1499 TRAVERSE LEFT (+) TRAVERSE RIGHT (-) GUN TARGET AZIMUTH 1500 - 1700 ATTITUDE<1600 TRAVERSE LEFT (-) TRAVERSE RIGHT (+) ATTITUDE>1600 TRAVERSE LEFT (+) TRAVERSE RIGHT (-) GUN TARGET AZIMUTH 1701 - 4699 TRAVERSE LEFT (-) TRAVERSE RIGHT (+) GUN TARGET AZIMUTH 4700-4900 ATTITUDE<1600 TRAVERSE LEFT (+) TRAVERSE RIGHT (-) ATTITUDE>1600 TRAVERSE LEFT (-) TRAVERSE RIGHT (+) NOTE: Attitudes can not be greater than 3200 mils. The difference between gun attitude and target attitude must not exceed 100 Mils. 7 97161 / 64031