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Dpa and ind towers have same local control frequency 120 pt 9 on occasion causes frequency interference.
| Attributes | |
| ACN | 279564 |
| Time | |
| Date | 199408 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dpa |
| State Reference | IL |
| Environment | |
| Flight Conditions | Mixed |
| Aircraft 1 | |
| Controlling Facilities | tower : dpa tower : ind |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Experience | controller non radar : 5 |
| ASRS Report | 279564 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
We are able to receive and occasionally transmit to aircraft operating with ind ATCT, both towers local control frequencys are 120.9. We had ind air traffic over-riding aircraft operating within dpa airspace. On numerous occasions we had to wait until the ind traffic stopped transmitting before we issued control instructions to our aircraft, otherwise we would just have to retransmit due to frequency congestion. Numerous aircraft commented that they heard a lot of other aircraft on the frequency. A possible solution: change tower frequency to something else.
Original NASA ASRS Text
Title: DPA AND IND TWRS HAVE SAME LCL CTL FREQ 120 PT 9 ON OCCASION CAUSES FREQ INTERFERENCE.
Narrative: WE ARE ABLE TO RECEIVE AND OCCASIONALLY XMIT TO ACFT OPERATING WITH IND ATCT, BOTH TWRS LCL CTL FREQS ARE 120.9. WE HAD IND AIR TFC OVER-RIDING ACFT OPERATING WITHIN DPA AIRSPACE. ON NUMEROUS OCCASIONS WE HAD TO WAIT UNTIL THE IND TFC STOPPED XMITTING BEFORE WE ISSUED CTL INSTRUCTIONS TO OUR ACFT, OTHERWISE WE WOULD JUST HAVE TO RETRANSMIT DUE TO FREQ CONGESTION. NUMEROUS ACFT COMMENTED THAT THEY HEARD A LOT OF OTHER ACFT ON THE FREQ. A POSSIBLE SOLUTION: CHANGE TWR FREQ TO SOMETHING ELSE.
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.