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Air carrier encountered radio signal interference on ZAU frequency 127 pt 45 from yip ATIS. ZAU controllers aware of the recurring problem.
| Attributes | |
| ACN | 156777 |
| Time | |
| Date | 199008 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cmi |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute airway : zau |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 160 flight time total : 9500 flight time type : 5000 |
| ASRS Report | 156777 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
During departure from cmi on flight en route from cmi to day, we experienced communications interference once established on frequency 127.45, ZAU. Frequency became unreadable and communication was reestablished with champaign approach controller. New frequency was issued for ZID while monitoring ZAU on 127.45. Communication was established and ZID took the handoff. Subsequently, communication was reestablished with ZAU and they were advised that we were now on ZID. The controller working ZAU frequency 127.45 advised that willow run airport ATIS utilized the same frequency and that interference has been a recurring problem. The lost communication problem was quickly resolved with the cmi departure controller, but ZAU was unable to communication although initial check-in was acknowledged and climb/route clearance given. The lost communication situation could have been avoided by frequency distribution protection and use of local VOR's for ATIS broadcasts in areas where discrete frequencys are a problem.
Original NASA ASRS Text
Title: AIR CARRIER ENCOUNTERED RADIO SIGNAL INTERFERENCE ON ZAU FREQ 127 PT 45 FROM YIP ATIS. ZAU CTLRS AWARE OF THE RECURRING PROBLEM.
Narrative: DURING DEP FROM CMI ON FLT ENRTE FROM CMI TO DAY, WE EXPERIENCED COMS INTERFERENCE ONCE ESTABLISHED ON FREQ 127.45, ZAU. FREQ BECAME UNREADABLE AND COM WAS REESTABLISHED WITH CHAMPAIGN APCH CTLR. NEW FREQ WAS ISSUED FOR ZID WHILE MONITORING ZAU ON 127.45. COM WAS ESTABLISHED AND ZID TOOK THE HDOF. SUBSEQUENTLY, COM WAS REESTABLISHED WITH ZAU AND THEY WERE ADVISED THAT WE WERE NOW ON ZID. THE CTLR WORKING ZAU FREQ 127.45 ADVISED THAT WILLOW RUN ARPT ATIS UTILIZED THE SAME FREQ AND THAT INTERFERENCE HAS BEEN A RECURRING PROB. THE LOST COM PROB WAS QUICKLY RESOLVED WITH THE CMI DEP CTLR, BUT ZAU WAS UNABLE TO COM ALTHOUGH INITIAL CHK-IN WAS ACKNOWLEDGED AND CLB/RTE CLRNC GIVEN. THE LOST COM SITUATION COULD HAVE BEEN AVOIDED BY FREQ DISTRIBUTION PROTECTION AND USE OF LCL VOR'S FOR ATIS BROADCASTS IN AREAS WHERE DISCRETE FREQS ARE A PROB.
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.