Belfort AWOS, Maintenance Manual

Page: 46 / 95

-43-
BELFORT
INSTRUMENT
Proprietary Information
10.0 C
OMPONENT
R
EMOVAL AND
R
EPLACEMENT
P
ROCEDURES
– Sensor removal procedures are
described in this section. Refer to the Belfort AWOS Installation and Checkout manual for
installation and checkout of replacement sensors and components.
Always assure that the safety precautions detailed in the Installation and Checkout manual
are followed whenever performing any component removal or replacement operations. After
replacement of components, always assure that applicable calibration and alignment
procedures are to be performed as described in the Installation and Checkout manual.
Documentation of replacement and checkout of system components must be recorded in the
Facility Maintenance Log, FAA Form 6030-1.
10.1 DCP
REMOVAL PROCEDURES
:
SAFETY PRECAUTIONS
1. Do not perform outdoor Belfort AWOS maintenance tasks during a thunderstorm.
2. Use extreme caution when lowering the tilt-over tower whenever ice or snow has accumulated
on the tower cross arm or the sensors. The extra weight may cause the tower to fall over
rapidly.
PARTS AND TOOLS REQUIRED
1. Replacement DCP enclosure (if available).
2. Phillips head screwdriver
Removal Procedures: Refer to Figure 8.
1. 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.
2. Remove tower-securing bolts and tilt the tower until the cross arm is at a comfortable
working height to access the DCP. 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.
3. Power down the power enclosure by opening the AC and DC circuit breakers.
4. Remove the four (4) pan head screws, lock washers and flat washers that secure the
DCP to the tower.
5. Remove the DCP from the tower and disconnect the antenna cable, power cable, 9-pin
communication cable, sensor harness and two hoses that connect to the remote pressure
ports from the rear of the DCP unit.
6. Note! Disconnect and remove the pressure port hoses by pulling them off of their
barbed fittings located below the antenna connector on the back of the DCP.
7. Examine the cables, cable connectors and pressure port hoses for damage to connector
pins or evidence of corrosion to connector assemblies. Examine the pressure port hoses
for cracks or other damage. Remove and replace any damaged cables or hoses.