while watching the indicator and comparing the read-
The alarm circuit takes the place of many routine
checks, since failure of the synchro signal amplifier
ings, you can determine if there is a problem with a
output to follow the input or loss of input excitation
detector. Every 90 days and after exposure to high
automatically completes the alarm circuit. The only
winds, inspect the detector mounting and tighten the
routine checks that are required are a monthly check of
mounting bolts if necessary. The rotor and vane also
the alarm circuit and yearly inspection of the gearing.
should be inspected every 90 days. Turn the rotor by
When inspecting the gearing, if dirt is found, clean
hand to confirm that it turns freely. Rotate the vane
the gears. If a gear shows excessive wear, replace it.
through 360° in both directions to assure it rotates freely.
Turn the gears manually, with the equipment de-
If friction or binding of the vane is suspected, perform
energized, noting whether the gears mesh smoothly.
the friction test. Every 6 months, the detector should be
Under normal conditions, the synchro signal
inspected, lubricated, and, if conditions warrant,
amplifier will require no lubrication. All rotary devices,
cleaned. Refer to the technical manual for specific pro-
are factory lubricated for the life of the equipment.
Every 6 months, the transmitter should be inspected,
Troubleshooting wind direction and indicating
lubricated, and, if warranted, cleaned. When inspecting
systems is simple once you have identified that you have
the transmitter, you should inspect the following:
a problem. Many potential problems can be avoided by
careful preventive maintenance. If the trouble is not
All moving parts for freeness.
avoided, you can at least identify it by following the
Planned Maintenance System (PMS) procedures. The
Gears for excessive wear and broken teeth.
principles of operation of the various components of the
systems were included in this chapter to aid you in
Bearings, gears, and other moving parts for
gummed oil, dust, and so on.
When troubleshooting the systems, you should refer
to the troubleshooting tables given in chapter 4 of the
Sensitive switches; turn them over and replace if
technical manual Operation and Maintenance Instruc-
tion - Wind Indicating Equipment, Type F, NAVSHIPS
0965-108-9010. These troubleshooting tables can be
Driving discs for wear.
very useful in that they enable personnel to locate mal-
functions and take the necessary corrective action. They
are also a quick reference guide.
MAINTENANCE OF ANEMOMETER
Watch the indicator periodically for uneven
movement of the pointer as this indicates a possible
problem. By comparing the pointer movement of one
Preventive maintenance for the system consists of
indicator with another, you can determine if the trouble
periodic inspections, cleaning, and lubrication. You
should refer to the appropriate technical manual for
is in a single indcator or in the system. Erratic indica-
specific procedures to follow. Many potential troubles
tions, resulting from excessive friction, often can be
in the system can be avoided by careful preventive
avoided by cleaning and oiling of the units. Other causes
of excessive friction may be discovered during periodic
maintenance inspection. When beginning a periodic
inspection, observe the indicators when there is enough
wind to act on the vane and rotor. The indicator requires
Most ships have a detector mounted port and star-
board on the mast. By switching from one to the other