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 TM 55-1905-242-14
OPERATOR, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
THEORY OF OPERATION
ALARM SYSTEMS
GENERAL
The LCM-8 Mod 2 is equipped with three alarm systems. The fire alarm system alerts the pilothouse and engine room to the
presence of fire in the engine room or smoke in the accommodation module. The general alarm system is used to alert the
crew to a general alarm condition. The engine alarm system alerts the operator to dangerous engine conditions.
FIRE ALARM SYSTEM
General
The fire alarm system alerts the pilothouse and engine room to the presence of fire in the engine room or smoke in the
accommodation module. The system is composed of a remote alarm panel, console indicator lights, smoke detectors, fire
detectors, and a horn/strobe unit. The system is powered by 24 Vdc supplied from the control and distribution panel in the
pilothouse. Foldout figure FO-4 contains the electrical wiring diagram for this system.
Remote Alarm Panel
The remote alarm panel, mounted on the pilothouse chart table, alerts the pilothouse crew to the presence of fire in the
engine room or smoke in the accommodation module. The panel contains an alarm horn that sounds when fire or smoke are
present in the monitored spaces. The panel also contains three indicator lights. The ENGINE RM light illuminates when an
engine room fire is detected. The ACCOM light illuminates when smoke is detected in the accommodation module. The
POWER light is illuminated any time the system is energized. The panel also contains two switches. The SILENCE switch
silences the alarm horn after an alarm condition is indicated. The PANEL TEST switch permits testing of the system. When
the PANEL TEST switch is moved to the ENGINE RM position, the alarm horn sounds and the ENGINE RM light illuminates.
When the PANEL TEST switch is moved to the ACCOM position, the alarm horn sounds, and the ACCOM light illuminates.
ENGINE RM
ACCOM
PANEL TEST
POWER
SILENCE
ENGINE RM
ACCOM
Console Indicator Lights
Two console indicator lights warn the coxswain of alarm conditions. The lights are mounted beneath the engine controls.
The ENG RM light illuminates to warn of fire in the engine room and the ACCOM light illuminates to warn of smoke in the
accommodation module. Illumination of the lights is controlled by the remote alarm panel.
0009 00-1
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