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Due to frequency congestion aircraft B descent to same altitude had less than standard separation from cpr X. System error.
| Attributes | |
| ACN | 202835 |
| Time | |
| Date | 199202 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : yqg |
| State Reference | ON |
| Altitude | msl bound lower : 10000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 202835 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 10800 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Cpr X was inbound over the junkr arrival fix and was stepped down on top of other crossing traffic also descending. Cpr X was given vectors to give additional room for descent. Air carrier X was at 11000 when aircraft B was told to expedite to 10000. This clearance was blocked, aircraft B was then told to maintain 12000 but wrong call sign was used. This clearance was not responded to either. Aircraft B descended to 10000 and separation was lost with cpr X. Some way to deal with frequency congestion would be of help. I don't know how this could be done with so many aircraft on one frequency and most in a transitioning phase of flight.
Original NASA ASRS Text
Title: DUE TO FREQ CONGESTION ACFT B DSCNT TO SAME ALT HAD LTSS FROM CPR X. SYS ERROR.
Narrative: CPR X WAS INBOUND OVER THE JUNKR ARR FIX AND WAS STEPPED DOWN ON TOP OF OTHER XING TFC ALSO DSNDING. CPR X WAS GIVEN VECTORS TO GIVE ADDITIONAL ROOM FOR DSCNT. ACR X WAS AT 11000 WHEN ACFT B WAS TOLD TO EXPEDITE TO 10000. THIS CLRNC WAS BLOCKED, ACFT B WAS THEN TOLD TO MAINTAIN 12000 BUT WRONG CALL SIGN WAS USED. THIS CLRNC WAS NOT RESPONDED TO EITHER. ACFT B DSNDED TO 10000 AND SEPARATION WAS LOST WITH CPR X. SOME WAY TO DEAL WITH FREQ CONGESTION WOULD BE OF HELP. I DON'T KNOW HOW THIS COULD BE DONE WITH SO MANY ACFT ON ONE FREQ AND MOST IN A TRANSITIONING PHASE OF FLT.
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.