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 TM 55-1905-220-14-2
2-121. HALON SYSTEM ALARMS.
a.
The Halon system gives audible and visual alarms for fire in the following compartments:
aft engine room
forward engine room
b.
A fire is detected by the heat detectors located in the aft and forward engine rooms.
c. The Halon control panel in the pilot house should have the audible alarm switch on. Refer
to paragraph 2-116 for turn-on procedure.
d. The Halon system can be operated in the following modes:
automatic
manual
remote manual
e.
Automatic Mode -
The following will occur automatically when a fire is detected in either the forward or aft engine room
compartments.
(1)
Forward or Aft Engine Room:
(a) Heat sensor (1) will sense fire, and heat up and expand the air contained within.
(b) The heated air will rush down tube to control head (2).
(c)
Pressure of heated air, will then trip indicator located in control head (2).
(d) Tripped indicator activates cylinder valve (3), will cause Halon to discharge from
cylinder (4)
through valve (3), pipe (5), and into the pressure
accumulator (6).
(e) Pressure accumulator serves as a Halon discharge delay, allowing personnel 30
seconds to exit.
(f)
After pressure accumulator fill-up, Halon will travel to nozzle (7) and discharge.
2-620
Change 4
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