FM 23-91.pdf - Marine Corps

More documents

Recommendations

Info

Figure 4-19. Example of completed DA Form 2601-1, MET Data Correction Sheet for Mortars. FM 23-91 4-25
FM 23-91 f. Air Temperature and Air Density Corrections. To determine the corrected values for air temperature and air density, the computer must first determine where the platoon or section is in relationship to the MDP (difference in H correction). To do so, the altitude of the section and the MDP are compared, and the smaller is subtracted from the larger. The remainder is the height of the platoon or section above or below the MDP. NOTE: If the altitude of the section is above the MDP, the sign is plus (+); if below, the sign is minus (-). (1) Once the distance above or below the MDP is known, the computer can enter Table B (Figure 4-20), which shows the correction that must be applied on the MET data correction sheet (Figure 4-19) to the ballistic AIR TEMP AIR DENSITY. This compensates for the difference in altitude between the platoon or section and the MDP, and determines the corrections for AIR TEMP (difference in T) and AIR DENSITY (difference in D). Those corrections modify the values of AIR TEMP and AIR DENSITY determined at the MDP to what they would be at the mortar platoon or section. Corrections for difference in T and difference in D are arranged in four double rows in the table. (2) The numbers 0, +100-, +200-, and +300- in the left column of the table represent difference in H expressed in hundreds of meters. The numbers 0 and +10through +90- across the top represent difference in H in tens of meters. The corrections can be found where the proper hundreds row crosses the proper tens column. The numerical sign of the corrections is opposite of the difference in H sign. 4-26
Page 1 and 2:
HEADQUARTERS FIELD MANUAL 23-91 DEP
Page 3 and 4:
FM 23-91 Section III. FIRE PLANNING
Page 5 and 6:
FM 23-91 iv Part Four M16 AND M19 P
Page 7 and 8:
PART ONE INTRODUCTION AND FUNDAMENT
Page 9 and 10: Figure 1-1. The indirect fire team.
Page 11 and 12: FM 23-91 2-2 AIMING POINT MORTAR AT
Page 13 and 14: FM 23-91 to initial projectile move
Page 15 and 16: FM 23-91 Its descending branch is s
Page 17 and 18: FM 23-91 2-13. STANDARD RANGE The s
Page 19 and 20: FM 23-91 (2) On-call targets are fi
Page 21 and 22: FM 23-91 formations, to disorganize
Page 23 and 24: FM 23-91 (1) The artillery and mort
Page 25 and 26: FM 23-91 • Location of the comman
Page 27 and 28: FM 23-91 up. Smoke is used to blind
Page 29 and 30: FM 23-91 (1) Quick and superquick f
Page 31 and 32: FM 23-91 and compounds the problem
Page 33 and 34: PART TWO FIRE DIRECTION CENTER CHAP
Page 35 and 36: FM 23-91 round-the-clock operations
Page 37 and 38: FM 23-91 4-2 Figure 4-3. Open sheaf
Page 39 and 40: FM 23-91 d. OBSERVER ID. Forward ob
Page 41 and 42: FM 23-91 (7) TIME SETTING—The tim
Page 43 and 44: FM 23-91 4-8 Figure 4-7. Example of
Page 45 and 46: FM 23-91 (c) FUZE TIME SETT (fuze t
Page 47 and 48: FM 23-91 4-12 OBSERVER-TARGET LINE
Page 49 and 50: FM 23-91 4-14 b. The 81-mm Mortar F
Page 51 and 52: FM 23-91 provide Tables A, B, C, D,
Page 53 and 54: FM 23-91 b. Source of MET Message.
Page 55 and 56: FM 23-91 4-20 Figure 4-16B. Example
Page 57 and 58: FM 23-91 4-22 26 - the direction fr
Page 59: FM 23-91 proper spaces on the form.
Page 63 and 64: FM 23-91 4-28 Figure 4-21. Sample p
Page 65 and 66: FM 23-91 NOTE: Within the firing ta
Page 67 and 68: FM 23-91 4-6.1 COMPUTER MET MESSAGE
Page 69 and 70: FM 23-91 The target area is usually
Page 71 and 72: FM 23-91 4-34 Figure 4-25. Example
Page 73 and 74: FM 23-91 determine corrections due
Page 75 and 76: FM 23-91 (2) Range correction. To g
Page 77 and 78: FM 23-91 sign of the larger for the
Page 79 and 80: CHAPTER 5 CALL FOR FIRE A call for
Page 81 and 82: FM 23-91 e. The target size and sha
Page 83 and 84: fire. (1) Unit(s) to fire—the num
Page 85 and 86: PART THREE MORTAR BALLISTIC COMPUTE
Page 87 and 88: 1 2 3 4 5 6 11 10 9 8 7 Figure 6-2.
Page 89 and 90: FM 23-91 (2) ADJ⎯2. For manual en
Page 91 and 92: FM 23-91 (1) Standby Indicator⎯1.
Page 93 and 94: f. Allows mortar dispersion up to 9
Page 95 and 96: FM 23-91 ^ RANGE TOO SMALL Differen
Page 97 and 98: FM 23-91 cannot be found for these
Page 99 and 100: FM 23-91 ACTION: Choose alternate n
Page 101 and 102: NO FO ENTERED No FO entry in missio
Page 103 and 104: SAFETY VIOLATION Impact point is ou
Page 105 and 106: CHAPTER 7 PREPARATION OF FIRE CONTR
Page 107 and 108: FM 23-91 (4) Numerical entry. After
Page 109 and 110: FM 23-91 NOTE: Latitude ( LAT -/+)
Page 111 and 112:
FM 23-91 (1) TEST and BRT. These ke
Page 113 and 114:
FM 23-91 (8) Press the SEQ switch.
Page 115 and 116:
FM 23-91 (3) Manually initialize an
Page 117 and 118:
FM 23-91 8-2 (1) AF STD RP , this d
Page 119 and 120:
FM 23-91 Once all adjustments have
Page 121 and 122:
FM 23-91 Press SEQ switch. (5) L R
Page 123 and 124:
FM 23-91 Press SEQ switch. (5) READ
Page 125 and 126:
FM 23-91 (1) SHEAF:PRL—This is th
Page 127 and 128:
FM 23-91 8-12 Figure 8-1. Call for
Page 129 and 130:
FM 23-91 c. After the adjustment is
Page 131 and 132:
FM 23-91 8-16 Figure 8-4. Example s
Page 133 and 134:
FM 23-91 8-18 Figure 8-6. Example o
Page 135 and 136:
FM 23-91 therefore, the 4.2-inch mo
Page 137 and 138:
FM 23-91 (a) Firing without extensi
Page 139 and 140:
FM 23-91 NOTE: A range spread shoul
Page 141 and 142:
CHAPTER 9 SPECIAL PROCEDURES Proced
Page 143 and 144:
FM 23-91 g. After the sheaf has bee
Page 145 and 146:
FM 23-91 (d) Press the SEQ switch.
Page 147 and 148:
FM 23-91 • Sequence to READY. The
Page 149 and 150:
FM 23-91 NOTES: 1. The FO will tell
Page 151 and 152:
FM 23-91 9-5. IMMEDIATE SMOKE OR IM
Page 153 and 154:
FM 23-91 (d) The wind speed in knot
Page 155 and 156:
Figure 9-3. FDC order. FM 23-91 (a)
Page 157 and 158:
FM 23-91 b. REVIEW Switch. This swi
Page 159 and 160:
CHAPTER 10 DIGITAL MESSAGE DEVICE S
Page 161 and 162:
FM 23-91 (4) SEQ switch. The FO ide
Page 163 and 164:
FM 23-91 11-2 Figure 11-1. M16 plot
Page 165 and 166:
FM 23-91 (3) On the bottom of the b
Page 167 and 168:
CHAPTER 12 PREPARATION OF FIRE CONT
Page 169 and 170:
Figure 12-2. Superimposition of ref
Page 171 and 172:
FM 23-91 each charge zone covers (F
Page 173 and 174:
Figure 12-8. Determination of defle
Page 175 and 176:
Figure 12-10. Hollow cross with tar
Page 177 and 178:
FM 23-91 (2) Once these actions hav
Page 179 and 180:
FM 23-91 (4) Now determine ranges d
Page 181 and 182:
NOTE: See survey firing chart in Ch
Page 183 and 184:
FM 23-91 c. Plotting of Mortar Posi
Page 185 and 186:
FM 23-91 (5) Determine the 1,000-me
Page 187 and 188:
Figure 12-21. Forward plotting targ
Page 189 and 190:
FM 23-91 b. Using the number of met
Page 191 and 192:
FM 23-91 correction applied is sent
Page 193 and 194:
FM 23-91 c. Range and Azimuth from
Page 195 and 196:
FM 23-91 13-2 Figure 13-1. Example
Page 197 and 198:
FM 23-91 c. To plot the target on t
Page 199 and 200:
FM 23-91 of mils that will cover th
Page 201 and 202:
FM 23-91 13-2. SEARCHING AND ZONE F
Page 203 and 204:
FM 23-91 Figure 13-6. Example of co
Page 205 and 206:
FM 23-91 mass of target.) This give
Page 207 and 208:
FM 23-91 13-14 ROUNDS M301A1 M301A2
Page 209 and 210:
FM 23-91 13-16 HOB LINE 600 METERS
Page 211 and 212:
FM 23-91 13-18 EXAMPLE Range to bur
Page 213 and 214:
CHAPTER 14 SPECIAL CONSIDERATIONS T
Page 215 and 216:
Figure 14-2. Deflection conversion
Page 217 and 218:
FM 23-91 f. Determining Firing Corr
Page 219 and 220:
FM 23-91 Determine to the nearest w
Page 221 and 222:
FM 23-91 i. Applying Firing Correct
Page 223 and 224:
Figure 14-8. Example of completed D
Page 225 and 226:
FM 23-91 (3) Record all data on DA
Page 227 and 228:
Figure 14-9. Example of completed D
Page 229 and 230:
TARGET SAME HEIGHT; NO RANGE CORREC
Page 231 and 232:
RP1 R50 Figure 14-11. Determination
Page 233 and 234:
FM 23-91 (1) Once the danger mortar
Page 235 and 236:
FM 23-91 f. When adjusting only the
Page 237 and 238:
FM 23-91 (5) The remaining plots fo
Page 239 and 240:
APPENDIX A MORTAR TRAINING STRATEGY
Page 241 and 242:
APPENDIX B SAFETY PROCEDURES FM 23-
Page 243 and 244:
FM 23-91 c. Vertical Interval and C
Page 245 and 246:
FM 23-91 (2) Draw lines representin
Page 247 and 248:
APPENDIX C FIELD-EXPEDIENT SURVEY T
Page 249 and 250:
4520 MILS POINT 1 POINT 8 AIMING CI
Page 251 and 252:
1 2 2 METERS Figure C-7. Subtense b
Page 253 and 254:
FM 23-91 h. This procedure is repea
Page 255 and 256:
APPENDIX D FIRE DIRECTION CENTER CE
Page 257 and 258:
• Compute data for searching fire
Page 259 and 260:
1. What is the initial range? (a) 3
Page 261 and 262:
FM 23-91 TASK: Compute data for sub
Page 263 and 264:
4. What is the correct initial fire
Page 265 and 266:
Figure D-3. Situation C. NOTE: The
Page 267 and 268:
FM 23-91 CONDITIONS: Given an MBC w
Page 269 and 270:
FM 23-91 TASK: Conduct a registrati
Page 271 and 272:
8 What is the angle T? (a) 0450 mil
Page 273 and 274:
FM 23-91 TASK: Record all informati
Page 275 and 276:
FM 23-91 NOTE: The FO spots the fir
Page 277 and 278:
16. What is the correct subsequent
Page 279 and 280:
FM 23-91 CONDITIONS: Given an initi
Page 281 and 282:
Page 283 and 284:
CONDITIONS: Given an initialized MB
Page 285 and 286:
26. What is the correct deflection
Page 287 and 288:
FM 23-91 SITUATION J The commander
Page 289 and 290:
FM 23-91 Shortly after the section
Page 291 and 292:
Page 293 and 294:
FM 23-91 33. What is the correct de
Page 295 and 296:
35. What is the subsequent command
Page 297 and 298:
FM 23-91 NOTE: The round is fired a
Page 299 and 300:
FM 23-91 NOTES: 1. No. 1 gun fires
Page 301 and 302:
FM 23-91 53. When receiving an FR f
Page 303 and 304:
FM 23-91 The section leader receive
Page 305 and 306:
Page 307 and 308:
61. What is the FDC order? (a) (b)
Page 309 and 310:
NOTE: The FO spots the first round
Page 311 and 312:
66. What is the correct initial fir
Page 313 and 314:
68. What is the direction of fire?
Page 315 and 316:
FM 23-91 TASK: Determine firing cor
Page 317 and 318:
APPENDIX E TERRAIN MORTAR POSITIONI
Page 319 and 320:
FM 23-91 meters and drawing the bur
Page 321 and 322:
AZ500 DF1800 #3 (BASE PIECE) 200 M
Page 323 and 324:
#6 ANSWERS: #5 #4 AZ6400 STEPS 7 AN
Page 325 and 326:
6 5 400 METERS 4 BASE PIECE Figure
Page 327 and 328:
Figure E-7. Example of completed DA
Page 329 and 330:
FM 23-91 E-4. APPLICATION OF TMPCs
Page 331 and 332:
APPENDIX F FIRE DIRECTION CENTER CE
Page 333 and 334:
f. Record MET data using MET data s
Page 335 and 336:
1. What is the initial range? (a) 3
Page 337 and 338:
TASK: CONDITIONS: STANDARD: Compute
Page 339 and 340:
4. What is the correct initial fire
Page 341 and 342:
NOTE: The initial round is fired, a
Page 343 and 344:
F-9. SITUATION D Your platoon has m
Page 345 and 346:
TASK: CONDITIONS: STANDARD: Conduct
Page 347 and 348:
NOTE: The FO sends: LEFT 100, ADD 1
Page 349 and 350:
FM 23-91 F-19
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
W13 immediately sends in another fi
Page 357 and 358:
NOTE: The firest mission’s initia
Page 359 and 360:
WPN DATA FO LOCATION 81-MM (M252) F
Page 361 and 362:
24. What are the correct initial de
Page 363 and 364:
Page 365 and 366:
NOTE: Temperature gradient-neutral
Page 367 and 368:
Page 369 and 370:
Page 371 and 372:
TASK: CONDITIONS: STANDARD: NOTES:
Page 373 and 374:
STANDARDS: Compute data for an illu
Page 375 and 376:
38. What is the correct FDC order?
Page 377 and 378:
43. When storing the MBC, the batte
Page 379 and 380:
Section V PLOTHNG BOARDS F-21. SITU
Page 381 and 382:
TASK: CONDITIONS: STANDARD: TASK: C
Page 383 and 384:
Page 385 and 386:
61. What is the FDC order? FM 23-91
Page 387 and 388:
62. What is the initial deflection?
Page 389 and 390:
Page 391 and 392:
68. What is the direction of fire?
Page 393 and 394:
NOTES: 1. The FO makes a spotting a
Page 395 and 396:
APPENDIX G TERRAIN MORTAR POSITIONI
Page 397 and 398:
a. To prepare the base for use in c
Page 399 and 400:
Step 5. Index the lay deflection fr
Page 401 and 402:
Sectors can also be computed for sh
Page 403 and 404:
. Determination of TMPCs for the ce
Page 405 and 406:
d. Determining TMPCs for left and r
Page 407 and 408:
GLOSSARY AAR after-action report AC
Page 409 and 410:
MAZ mounting azimuth MBC mortar bal
Page 411 and 412:
vs versus VT variable time WP white
Page 413 and 414:
FM 23-91 STP 7-11C14-SM-TG Soldier'
Page 415 and 416:
FM 23-91 determining range differen
Page 417 and 418:
FM 23-91 mortar ballistic computer,
Page 419:
FM 23-91 transfer of, 12-19 types o
show all

FM 23-91.pdf - Marine Corps

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?