TM-9-2350-311-10
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; OPERATOR’S MANUAL
NOVEMBER 1994
TM-9-2350-311-10 - Page 7 of 775
TM 9--2350--311--10
Change 6
e
WARNING
High intensity hearing protection required. Failure to wear hearing protection could result in
hearing impairment. It is imperative that the following table be followed to ensure personnel do
not accumulate more than 1000 points in a 24 hour period.
NOTE
•
If hatches are closed, use blast overpressure and lead parameter and if hatches are open,
use only blast overpressure parameter.
•
Do not combine the total points of the two parameters. Each parameter has its own 1000
point limit.
BLAST OVERPRESSURE/LEAD HAZARD POINT RATING SYSTEM
IF THE DRIVER IS NOT IN THE DRIVERS COMPARTMENT
(1000 POINT LIMIT)
PARAMETER
CONDITION
PROPELLING CHARGES
M3/M4
M119
M203
M231
Chg1
M231
Chg2
M232/
M232A1
Chg3
M232/
M232A1
Chg4
M232/
M232A1
Chg5
LEAD
HATCH CLOSED
2.3
12
22.2
NA
NA
NA
NA
NA
SINGLE
REAR & SIDE OPEN
6
37
P
1
1
71
P
P
HEARING
REAR ONLY OPEN
6
37
P
1
1
71
83
P
PROTECTION
HATCHES CLOSED
6
37
6
1
1
1
8
8
P=Prohibited
Note: Since the blast overpressure exceeds 1000 when firing the family of M203 and M232/M232A1 charges
with the hatches open, firing the M203 and M232/M232A1 charges with hatches open is prohibited.
Example: To figure 1000 point limit of lead parameter
25 M3/M4 Charges 25 x 2.3 = 58 points
25 M119 Charges 25 x 12
= 300 points
25 M203 Charges 25 x 22.2 = 555 points
913 points
Example: To figure 1000 point limit of blast overpressure parameter
25 M3/M4 Charges 25 x 6
= 150 points
22 M119 Charges 22 x 37
= 814 points
964 points
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