Belfort AWOS Maintenance Manual Download

Page: 43 / 95

-40-

BELFORT

INSTRUMENT

Proprietary Information

21.

After installation of a replacement sensor, perform the Annual Wind Speed Sensor
Verification Procedure detailed in section 5.5 of this manual.

22.

If the sensor is operational and maintenance tasks are complete, toggle the “ALERT
MESSAGE” switch 4 times to return the unit to service.

23.

At the DATU display operator’s terminal, when all maintenance actions are complete, issue
another NOTAM advising users that “

Belfort AWOS

maintenance activities were

completed, system has been returned to normal operation

.” The expiration date and

time of this NOTAM should coincide with the same expiration date and time of the previous
advisory NOTAM that was issued to put the system in the maintenance mode. Verify that
this NOTAM advisory is correctly displayed on the operator screen. Refer to the

"Belfort

AWOS Operator Manual"

for instructions on how to enter and delete NOTAMs

Wind Direction Indicators

If either of the wind direction indicators are set, this could mean that the direction sensor is
not reporting to the DCP, the direction value has not changed for the specified duration of
time or the DCP direction input has failed.

At the DATU display terminal, issue a NOTAM advisory to alert users that the Belfort
AWOS system is being serviced prior to beginning investigation of this fault. The NOTAM
to be issued is "

Belfort AWOS system being serviced, do not use current weather data

outputs

." Verify that this NOTAM advisory is displayed on the operator screen prior to

beginning this maintenance tasks. Refer to the "Belfort AWOS Operator Manual" for
instructions on how to enter and delete NOTAMs.

Put the Belfort AWOS in “service mode” by toggling the “ALERT MESSAGE” toggle
switch located on the lower half of the hinged tower section six (6) times.

Remove  tower-securing  bolts  and  tilt  the  tower  until  the  cross  arm  is  at  a  comfortable
working height to access the wind speed sensor.  Secure the tower in that position by tying
the  attached  tower  hold-down  rope  to  the  base  of  the  Belfort  AWOS  tower  as  shown  in
Figure 2.

Power down the power enclosure.

Remove the DCP from the tower and disconnect all cables at the back of the DCP.

Inspect DCP and cable connectors for damage, pushed in pins, broken contacts or evidence
of corrosion. Repair or replace damaged or corroded cables as required.

Clean and lubricate DCP connectors and mating cable connectors with Dow Corning #4 to
prevent corrosion. Reconnect cables to the back of the DCP and reinstall the DCP onto the
tower.

Remove the wind direction sensor from the tower cross arm and disconnect the sensor from
the cable.

10.

Inspect the sensor connector and mating cable connector for damage, pushed in pins, broken
contacts or evidence of corrosion. Repair or replace the sensor cable if required.

11.

Clean and lubricate the sensor connector and mating cable connectors with Dow Corning
#4 to prevent corrosion and then reconnect the cable to the sensor.

12.

Reinstall the wind direction sensor onto the tower cross arm.

13.

Power up the power enclosure.

14.

Spin the wind direction sensor and look on the HHDU, and check to see if the direction
value is changing and the sensor has returned to operation. If so, go to step 19.

15.

If these actions have not returned the sensor to service, the sensor need to be replaced.