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Wind Speed Interference From Callaway’s Aviation Beacon. Tim Waldron, Met Associates Kip Barbour, Callaway Plant October 9, 2003. Wind Speed Interference at Night.
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Tim Waldron, Met Associates
Kip Barbour, Callaway Plant
October 9, 2003
In early April 2002 while validating Callaway Plant's meteorological data for the Annual Effluent Release Report, Tim Waldron of Met Associates, Inc. performed differential analysis of the Primary Tower 10M WS data compared to the Secondary 10M WS data. This analysis identified an approximate 3 m/s bias on the Primary Tower data, but only at night.
The following slides provide some examples of the differential analysis used by Met Associates to identify the intermittent bias found in the Callaway Plant wind speed data.
A Flash Technology FTB 310-4 strobe beacon was installed in September 1997.
Cable to beacon
Conduit to Photocell
Federal Aviation Administration Advisory Circular, AC 70/7460-1K
23. Light Failure Notification
b. Any failure or malfunction that lasts longer than thirty (30) minutes and affects a top light or flashing obstruction light, regardless of its position, should be reported immediately to the nearest flight service station (FSS) so a Notice to Airmen (NOTAM) can be issued.
FAA’s website: www.faa.gov/ats/ata/ata400
This report should contain the following information:
24. Notification of Restoration
As soon as normal operation is restored, notify the same AFSS/FSS that received the notification of failure. The FCC advises that noncompliance with notification procedures could subject its sponsor to penalties or monetary forfeitures.
I contacted the following sources:
Richard Schawba of Innovative Flash stated that he was only aware of one case where the flash head itself was creating an RFI field on a communications tower. They finally corrected the affect by installing a wire mesh around the flash head.
The Flash Technology representative stated that they do not endorse installing a mesh over their flash head.* He recommended moving the beacon cable away from the sensor cables. He stated that they had had similar problems on communications towers when the beacon cable was installed too close to the communications lines.
*However, he also gave me the name and phone number of a competitor that sells a wire mesh made to fit their flash head…
Matt Parker, W Savannah River Company
Tom Payne, Waterford 3
Bob Pickwoad, Palo Verde
Ralph Heistand, Turkey Point
Retired cables and waveguides.
110 VAC power.
Tower ground cable.
110 VAC in
An Unexpected Discovery:
The sensor cable shields were cut off at the rack TB,
and were not grounded as shown on the rack drawings.