- 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: FM 23-91 (2) On-call targets are fi
- 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 and 60: FM 23-91 proper spaces on the form.
- Page 61 and 62: FM 23-91 f. Air Temperature and Air
- 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
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FM 23-91 4-34 Figure 4-25. Example
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FM 23-91 determine corrections due
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FM 23-91 (2) Range correction. To g
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FM 23-91 sign of the larger for the
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CHAPTER 5 CALL FOR FIRE A call for
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FM 23-91 e. The target size and sha
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fire. (1) Unit(s) to fire—the num
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PART THREE MORTAR BALLISTIC COMPUTE
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1 2 3 4 5 6 11 10 9 8 7 Figure 6-2.
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FM 23-91 (2) ADJ⎯2. For manual en
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FM 23-91 (1) Standby Indicator⎯1.
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f. Allows mortar dispersion up to 9
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FM 23-91 ^ RANGE TOO SMALL Differen
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FM 23-91 cannot be found for these
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FM 23-91 ACTION: Choose alternate n
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NO FO ENTERED No FO entry in missio
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SAFETY VIOLATION Impact point is ou
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CHAPTER 7 PREPARATION OF FIRE CONTR
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FM 23-91 (4) Numerical entry. After
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FM 23-91 NOTE: Latitude ( LAT -/+)
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FM 23-91 (1) TEST and BRT. These ke
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FM 23-91 (8) Press the SEQ switch.
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FM 23-91 (3) Manually initialize an
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FM 23-91 8-2 (1) AF STD RP , this d
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FM 23-91 Once all adjustments have
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FM 23-91 Press SEQ switch. (5) L R
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FM 23-91 Press SEQ switch. (5) READ
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FM 23-91 (1) SHEAF:PRL—This is th
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FM 23-91 8-12 Figure 8-1. Call for
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FM 23-91 c. After the adjustment is
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FM 23-91 8-16 Figure 8-4. Example s
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FM 23-91 8-18 Figure 8-6. Example o
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FM 23-91 therefore, the 4.2-inch mo
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FM 23-91 (a) Firing without extensi
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FM 23-91 NOTE: A range spread shoul
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CHAPTER 9 SPECIAL PROCEDURES Proced
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FM 23-91 g. After the sheaf has bee
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FM 23-91 (d) Press the SEQ switch.
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FM 23-91 • Sequence to READY. The
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FM 23-91 NOTES: 1. The FO will tell
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FM 23-91 9-5. IMMEDIATE SMOKE OR IM
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FM 23-91 (d) The wind speed in knot
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Figure 9-3. FDC order. FM 23-91 (a)
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FM 23-91 b. REVIEW Switch. This swi
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CHAPTER 10 DIGITAL MESSAGE DEVICE S
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FM 23-91 (4) SEQ switch. The FO ide
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FM 23-91 11-2 Figure 11-1. M16 plot
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FM 23-91 (3) On the bottom of the b
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CHAPTER 12 PREPARATION OF FIRE CONT
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Figure 12-2. Superimposition of ref
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FM 23-91 each charge zone covers (F
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Figure 12-8. Determination of defle
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Figure 12-10. Hollow cross with tar
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FM 23-91 (2) Once these actions hav
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FM 23-91 (4) Now determine ranges d
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NOTE: See survey firing chart in Ch
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FM 23-91 c. Plotting of Mortar Posi
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FM 23-91 (5) Determine the 1,000-me
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Figure 12-21. Forward plotting targ
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FM 23-91 b. Using the number of met
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FM 23-91 correction applied is sent
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FM 23-91 c. Range and Azimuth from
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FM 23-91 13-2 Figure 13-1. Example
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FM 23-91 c. To plot the target on t
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FM 23-91 of mils that will cover th
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FM 23-91 13-2. SEARCHING AND ZONE F
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FM 23-91 Figure 13-6. Example of co
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FM 23-91 mass of target.) This give
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FM 23-91 13-14 ROUNDS M301A1 M301A2
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FM 23-91 13-16 HOB LINE 600 METERS
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FM 23-91 13-18 EXAMPLE Range to bur
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CHAPTER 14 SPECIAL CONSIDERATIONS T
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Figure 14-2. Deflection conversion
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FM 23-91 f. Determining Firing Corr
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FM 23-91 Determine to the nearest w
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FM 23-91 i. Applying Firing Correct
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Figure 14-8. Example of completed D
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FM 23-91 (3) Record all data on DA
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Figure 14-9. Example of completed D
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TARGET SAME HEIGHT; NO RANGE CORREC
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RP1 R50 Figure 14-11. Determination
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FM 23-91 (1) Once the danger mortar
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FM 23-91 f. When adjusting only the
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FM 23-91 (5) The remaining plots fo
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APPENDIX A MORTAR TRAINING STRATEGY
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APPENDIX B SAFETY PROCEDURES FM 23-
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FM 23-91 c. Vertical Interval and C
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FM 23-91 (2) Draw lines representin
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APPENDIX C FIELD-EXPEDIENT SURVEY T
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4520 MILS POINT 1 POINT 8 AIMING CI
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1 2 2 METERS Figure C-7. Subtense b
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FM 23-91 h. This procedure is repea
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APPENDIX D FIRE DIRECTION CENTER CE
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• Compute data for searching fire
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1. What is the initial range? (a) 3
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FM 23-91 TASK: Compute data for sub
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4. What is the correct initial fire
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Figure D-3. Situation C. NOTE: The
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FM 23-91 CONDITIONS: Given an MBC w
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FM 23-91 TASK: Conduct a registrati
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8 What is the angle T? (a) 0450 mil
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FM 23-91 TASK: Record all informati
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FM 23-91 NOTE: The FO spots the fir
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16. What is the correct subsequent
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FM 23-91 CONDITIONS: Given an initi
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FM 23-91 TASK: Compute data for sub
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CONDITIONS: Given an initialized MB
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26. What is the correct deflection
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FM 23-91 SITUATION J The commander
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FM 23-91 Shortly after the section
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FM 23-91 TASK: Compute data for sub
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FM 23-91 33. What is the correct de
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35. What is the subsequent command
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FM 23-91 NOTE: The round is fired a
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FM 23-91 NOTES: 1. No. 1 gun fires
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FM 23-91 53. When receiving an FR f
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FM 23-91 The section leader receive
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60. What is the correct subsequent
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61. What is the FDC order? (a) (b)
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NOTE: The FO spots the first round
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66. What is the correct initial fir
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68. What is the direction of fire?
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FM 23-91 TASK: Determine firing cor
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APPENDIX E TERRAIN MORTAR POSITIONI
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FM 23-91 meters and drawing the bur
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AZ500 DF1800 #3 (BASE PIECE) 200 M
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#6 ANSWERS: #5 #4 AZ6400 STEPS 7 AN
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6 5 400 METERS 4 BASE PIECE Figure
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Figure E-7. Example of completed DA
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FM 23-91 E-4. APPLICATION OF TMPCs
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APPENDIX F FIRE DIRECTION CENTER CE
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f. Record MET data using MET data s
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1. What is the initial range? (a) 3
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TASK: CONDITIONS: STANDARD: Compute
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4. What is the correct initial fire
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NOTE: The initial round is fired, a
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F-9. SITUATION D Your platoon has m
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TASK: CONDITIONS: STANDARD: Conduct
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NOTE: The FO sends: LEFT 100, ADD 1
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FM 23-91 F-19
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TASK: CONDITIONS: STANDARD: Compute
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16. What is the correct subsequent
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W13 immediately sends in another fi
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NOTE: The firest mission’s initia
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WPN DATA FO LOCATION 81-MM (M252) F
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24. What are the correct initial de
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27. What is the correct initial fir
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NOTE: Temperature gradient-neutral
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31. What is the correct initial fir
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TASK: CONDITIONS: STANDARD: Compute
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TASK: CONDITIONS: STANDARD: NOTES:
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STANDARDS: Compute data for an illu
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38. What is the correct FDC order?
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43. When storing the MBC, the batte
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Section V PLOTHNG BOARDS F-21. SITU
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TASK: CONDITIONS: STANDARD: TASK: C
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60. What is the correct subsequent
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61. What is the FDC order? FM 23-91
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62. What is the initial deflection?
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66. What is the correct initial fir
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68. What is the direction of fire?
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NOTES: 1. The FO makes a spotting a
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APPENDIX G TERRAIN MORTAR POSITIONI
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a. To prepare the base for use in c
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Step 5. Index the lay deflection fr
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Sectors can also be computed for sh
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. Determination of TMPCs for the ce
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d. Determining TMPCs for left and r
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GLOSSARY AAR after-action report AC
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MAZ mounting azimuth MBC mortar bal
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vs versus VT variable time WP white
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FM 23-91 STP 7-11C14-SM-TG Soldier'
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FM 23-91 determining range differen
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FM 23-91 mortar ballistic computer,
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FM 23-91 transfer of, 12-19 types o