TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 61 of 828
TM 9–2350–311–20–2
1–30
1–18 EQUIPMENT OPERATION AND DESCRIPTION — CONTINUED
1–18.5
NBC System (M109A4/M109A5 Only)
a.
NBC CONTROL BOX ASSEMBLY. The NBC control box assembly (1) located at commander’s station turns the NBC
system on and off.
b.
M2A2 AIR PURIFIER. The M2A2 air purifier (2) pulls contaminated air through gas and particulate filters and distrib-
utes clean air through hoses to individual M3 electrical air heaters.
c.
M3 ELECTRIC AIR HEATERS. The section chief’s heater (3), cannoneer no. 1’s heater (4), gunner’s heater (5), and
assistant gunner’s heater (6) located on the cab ceiling, warm filtered air for individual crew member’s comfort.
d.
ORIFICE CONNECTORS. The orifice connectors (7) attach purification system to M25A1 field protective masks.
7
4
5
3
7
1
6
2
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