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 43 of 775
TM 9-2350-311-10
1-9 LIST OF ABBREVIATIONS — CONTINUED
KMPH
L
LCD
LED
LHR
LPRS
M
MAX
MIN
MM
MOPP
MPH
MT
MTOE
MTSQ
NATO
NBC
NCO
NRC
PD
Kilometers Per Hour
Liter
Liquid Crystal Display
Light Emitting Diode
Low Heat Rejection
Loose Projectile Restraint System
Meter
Maximum
Minimum
Millimeter
Mission-Oriented Protective Posture
Miles Per Hour
Mechanical Time
Modified Table of Allowances
and Equipment
Mechanical Time Super Quick
North Atlantic Treaty Organization
Nuclear, Biological, and Chemical
Non-Commissioned Officer
Nuclear Regulatory Commission
Point Detonating
PLL
Prescribed Load List
PMCS
Preventive Maintenance Checks
and Services
PROX
Proximity
PSI
Pounds Per Square Inch
RAAM
Remote Anti-Armor Mine
RAP
Rocket Assisted Projectile
RDS
Rounds
RPM
Revolutions Per Minute
RPO
Radiation Protection Officer
SF
Standard Form
SINCGARS Single Channel Ground and Airborne Radio
SOP
Standing Operating Procedures
SP
Self-Propelled
SQ
Super Quick
TOE
Table of Organization and Equipment
V
Volts
VAC
Volts Alternating Current
VDC
Volts Direct Current
VT
Variable Time
WP
White Phosphorous
Section Il.
EQUIPMENT DESCRIPTION
1–10 EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
The medium, self-propelled howitzer is a full-tracked, armored combat support, internally loaded, air transportable,
vehicle powered by an eight cylinder, diesel engine. The vehicle carries a crew of six: howitzer driver, chief of section,
two cannoneers, gunner, and assistant gunner.
The primary armament on M109A2/M109A3/M109A4 howitzers includes a 155MMM185 cannon assembly and M178
mount, with firing accomplished by an M35 firing mechanism which uses cartridge type primers. The primary armament
on M109A5 howitzers includes a 155MMM284 cannon assembly and M182 mount, with firing accomplished by an M49
firing mechanism. The secondary armament is a caliber 50 machine gun.
The hull and cab assemblies protect the crew and equipment against small arms fire. The vehicle is divided into three
sections: driver’s compartment, engine compartment, and fighting compartment.
M109A4/M109A5 howitzers contain nuclear, biological, and chemical (NBC) equipment that allows the crew to operate
the howitzer in an NBC environment.
1-5
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