Belfort AWOS, Руководство по обслуживанию

Страница: 42 / 95

-39-
BELFORT
INSTRUMENT
Proprietary Information
Wind Speed Indicators
1. If either of the wind speed indicators are set, this could mean that the speed sensor is not
reporting to the DCP, the speed value has not changed for the specified duration of time or
the DCP wind speed input has failed.
2. 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.
3. 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.
4. 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.
5. Power down the power enclosure.
6. Remove the DCP from the tower and disconnect all cables at the back of the DCP.
7. 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.
8. 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.
9. Remove the wind speed 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 speed sensor onto the tower cross arm.
13. Power up the power enclosure.
14. Spin the wind speed sensor and look on the HHDU, and check to see if the sensor has
returned to service. If the sensor has returned to service, go to step 19.
15. If these actions have not returned the sensor to operation, return the sensor for replacement.
16. If no replacement sensor is immediately available, remove the faulty sensor from the system.
17. Put the Belfort AWOS Alert in “Wind speed Inoperable” mode by toggling the “ALERT
MESSAGE” toggle switch located on the lower half of the hinged tower section two (2)
times.
18. The Wind Speed will be reported by the system as ‘Not Available” until the replacement
sensor is installed.
19. Untie the rope and SLOWLY erect the tower to the vertical position and secure it by
installing and tighten-up (DO NOT OVER TIGHTEN) the three (3) tower-securing bolts.
NOTE: Be careful to avoid pinching the wires on the inside of the hinged Tower Section
when raising the tower.
20. If a system component has been determined to be faulty or suspect bad, go to Section 5.10
and follow those instructions.