TM 55-1930-209-14&P-1
5-11 Performance characteristics
Power input
12 Vdc, 2A
Frequency
390 .3 Hz
Distance of sound
1/2 mile in all directions
Frequency of sound
2 seconds with 18 seconds silence
Sound level
122.7 dB @ 12V
5-12 Description of operation. When foghorn ON/OFF switch on foghorn remote control is set to ON and foghorn
button is pushed, foghorn will automatically sound periodically. Foghorn sounds until switch is set to OFF.
5-13 Operating Instructions
5-13.1 Operating controls and Indicators. Foghorn controls are shown in Figure 5-12.
5-13.2 Prestart procedures. Following procedures are performed by operator before activating foghorn.
a.
Perform before operation checks below:
(1)
Make sure foghorn installation is complete.
(2)
Check for corrosion or rust. Clean and touch up paint as necessary. See paragraph 5-7.2a.
(3)
Check controls to make sure that switches or pushbuttons are not missing, broken, or loose and that
controls operate properly.
(4)
Check for loose plugs and jacks. Tighten if necessary.
(5)
Check for loose mountings, hardware, brackets, etc. Tighten as necessary.
b.
Make sure foghorn ON/OFF switch is OFF.
c.
Make sure circuit breaker 6P14 on 24 Vdc power panel is dosed (ON).
5-13.3 Operating procedures
a.
Turn foghorn ON/OFF switch on remote control box (Figure 5-12) to ON.
b.
Push in foghorn button to start foghorn sound.
NOTE
Foghorn sounds for 2 seconds, is silent for 18 seconds, and repeats cycle until
stopped.
5-13.4 Shutdown procedure. When foghorn is to be stopped, set foghorn ON/OFF switch to OFF. Perform before
operation checks in paragraph 5-13.2a as appropriate.
Table 5-3. Foghorn Major Components
Component
Location
Function
Foghorn remote control
Dayroom on forward bulkhead
For manual or automatic
activation of foghorn
Regulator
Dayroom on forward bulkhead
Converts 24 Vdc input to 12
Vdc output required by
foghorn
Foghorn
Deckhouse top on portside
Produces an omnidirectional
forward
signal that can be heard 1/2
mile away
5-21
