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LLWS west boundary wind sensor transmitting numerous false alarms due the shielding effect of nearby buildings and or terrain.
| Attributes | |
| ACN | 165855 |
| Time | |
| Date | 199012 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bdl |
| State Reference | CT |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Experience | controller military : 4 controller non radar : 4 |
| ASRS Report | 165855 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
At bradley airport we have a LLWS alert system with remote sensors. One boundary sensor, the west boundary is located in such an area; that because of its proximity to buildings and/or terrain, give numerous false alarms which contradict on a full time basis all the other sensors. This had been an ongoing problem as we are required to issue the warning to pilots regardless of whether the controller believes in the alarm. Some controllers, however, have taken a 'cry wolf' type attitude in which they believe all alarms from the west boundary are false. I would like to see the boundary decommissioned until some time action can be taken to move it from its present location or raise it to a level above the surrounding buildings. Callback conversation with reporter revealed the following information. Reporter stated that an ucr was filed by another controller on the LLWS west boundary sensor problem. No action was taken on the ucr. However, the LLWS equipment was modified and the new system has been on line since 2/tue/91. Reporter said the west boundary wind sensor is not transmitting false alarms. Apparently, the equipment modification corrected the problem. Reporter is satisfied with the status of the LLWS system.
Original NASA ASRS Text
Title: LLWS WEST BOUNDARY WIND SENSOR TRANSMITTING NUMEROUS FALSE ALARMS DUE THE SHIELDING EFFECT OF NEARBY BUILDINGS AND OR TERRAIN.
Narrative: AT BRADLEY ARPT WE HAVE A LLWS ALERT SYS WITH REMOTE SENSORS. ONE BOUNDARY SENSOR, THE W BOUNDARY IS LOCATED IN SUCH AN AREA; THAT BECAUSE OF ITS PROX TO BUILDINGS AND/OR TERRAIN, GIVE NUMEROUS FALSE ALARMS WHICH CONTRADICT ON A FULL TIME BASIS ALL THE OTHER SENSORS. THIS HAD BEEN AN ONGOING PROB AS WE ARE REQUIRED TO ISSUE THE WARNING TO PLTS REGARDLESS OF WHETHER THE CTLR BELIEVES IN THE ALARM. SOME CTLRS, HOWEVER, HAVE TAKEN A 'CRY WOLF' TYPE ATTITUDE IN WHICH THEY BELIEVE ALL ALARMS FROM THE W BOUNDARY ARE FALSE. I WOULD LIKE TO SEE THE BOUNDARY DECOMMISSIONED UNTIL SOME TIME ACTION CAN BE TAKEN TO MOVE IT FROM ITS PRESENT LOCATION OR RAISE IT TO A LEVEL ABOVE THE SURROUNDING BUILDINGS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR STATED THAT AN UCR WAS FILED BY ANOTHER CTLR ON THE LLWS WEST BOUNDARY SENSOR PROB. NO ACTION WAS TAKEN ON THE UCR. HOWEVER, THE LLWS EQUIP WAS MODIFIED AND THE NEW SYS HAS BEEN ON LINE SINCE 2/TUE/91. RPTR SAID THE W BOUNDARY WIND SENSOR IS NOT XMITTING FALSE ALARMS. APPARENTLY, THE EQUIP MODIFICATION CORRECTED THE PROB. RPTR IS SATISFIED WITH THE STATUS OF THE LLWS SYS.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.