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DC10 crew lost communication with ZKC which resulted in less than legal separation with another aircraft.
| Attributes | |
| ACN | 590983 |
| Time | |
| Date | 200308 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zkc.artcc |
| State Reference | KS |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc tower : ttn.tower |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zkc.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 10000 flight time type : 1000 |
| ASRS Report | 590983 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 4700 flight time type : 2500 |
| ASRS Report | 590876 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : far non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued new clearance controller : issued advisory |
| Consequence | faa : assigned or threatened penalties faa : investigated other |
| Miss Distance | horizontal : 24000 |
| Supplementary | |
| Problem Areas | ATC Human Performance Navigational Facility FAA |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | communication equipment : zkc.artcc |
Narrative:
From our viewpoint, the flight proceeded uneventfully from takeoff to landing. We were checking in with each ATC facility and switching frequencys normally. The first officer and so were on headset, and the captain had the overhead speaker turned up. (The captain's communication system had been previously written up for problems transmitting.) we never received any word from any ATC facility that something was abnormal. However, the next morning, our company advised us that ZKC lost separation between us and another flight. It seems the controller failed to provide sufficient heading changes to the other aircraft, with whom he was in contact. Although ZKC claims they tried to contact us several times as the conflict developed, none of us heard the calls. We have subsequently been advised by our company that this particular quadrant and frequency in ZKC has repeatedly lost contact with aircraft on other occasions, suggesting a radio 'dead zone' may exit in the area. Callback conversation with reporter revealed the following information: crew was contacted by his air carrier, and was told that ZKC was taking enforcement action against the crew. The captain notes that his air carrier and other acrs have reported communication problems on the frequency. He thinks that the frequency is 135.5 he reports that there is a radio dead spot in this area.
Original NASA ASRS Text
Title: DC10 CREW LOST COM WITH ZKC WHICH RESULTED IN LESS THAN LEGAL SEPARATION WITH ANOTHER ACFT.
Narrative: FROM OUR VIEWPOINT, THE FLT PROCEEDED UNEVENTFULLY FROM TKOF TO LNDG. WE WERE CHKING IN WITH EACH ATC FACILITY AND SWITCHING FREQS NORMALLY. THE FO AND SO WERE ON HEADSET, AND THE CAPT HAD THE OVERHEAD SPEAKER TURNED UP. (THE CAPT'S COM SYS HAD BEEN PREVIOUSLY WRITTEN UP FOR PROBS XMITTING.) WE NEVER RECEIVED ANY WORD FROM ANY ATC FACILITY THAT SOMETHING WAS ABNORMAL. HOWEVER, THE NEXT MORNING, OUR COMPANY ADVISED US THAT ZKC LOST SEPARATION BTWN US AND ANOTHER FLT. IT SEEMS THE CTLR FAILED TO PROVIDE SUFFICIENT HEADING CHANGES TO THE OTHER ACFT, WITH WHOM HE WAS IN CONTACT. ALTHOUGH ZKC CLAIMS THEY TRIED TO CONTACT US SEVERAL TIMES AS THE CONFLICT DEVELOPED, NONE OF US HEARD THE CALLS. WE HAVE SUBSEQUENTLY BEEN ADVISED BY OUR COMPANY THAT THIS PARTICULAR QUADRANT AND FREQ IN ZKC HAS REPEATEDLY LOST CONTACT WITH ACFT ON OTHER OCCASIONS, SUGGESTING A RADIO 'DEAD ZONE' MAY EXIT IN THE AREA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CREW WAS CONTACTED BY HIS ACR, AND WAS TOLD THAT ZKC WAS TAKING ENFORCEMENT ACTION AGAINST THE CREW. THE CAPT NOTES THAT HIS ACR AND OTHER ACRS HAVE RPTED COM PROBS ON THE FREQ. HE THINKS THAT THE FREQ IS 135.5 HE RPTS THAT THERE IS A RADIO DEAD SPOT IN THIS AREA.
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.