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Medium large transport off ARTCC frequency for 4 minutes while descending and had less than standard separation with mlt flight. OJT in progress at ARTCC.
| Attributes | |
| ACN | 161674 |
| Time | |
| Date | 199011 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : irk |
| State Reference | MO |
| Altitude | msl bound lower : 19500 msl bound upper : 21000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Military Transport |
| Flight Phase | cruise other cruise other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| ASRS Report | 161674 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 161682 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
I am a trnee. I descended medium large transport X to FL190 from FL230 to resolve a conflict. There was a military mlt Y holding just west of my sector at FL200. The military aircraft turned around in his holding pattern and came eastbound. 1 1/2 mins after I gave the descent clearance my instrument intervened and took over the sector. My instrument called medium large transport X 4 times to try and stop the aircraft at FL210. The aircraft finally responded. My instrument also turned the aircraft. The sector west of me turned the military aircraft also. I believe the conflict could have easily been resolved if the medium large transport X would have answered my instrument on the first call. Supplemental information from acn 161682: an adjacent sector was holding flight of 2 mlt Y's in orbit at irk 316018 at FL200 awaiting 2 receivers to conduct aerial refueling on AR318. Medium large transport X jet from dsm to stl at FL230. Medium large transport X was issued a descent clearance to FL190. The military aircraft then made an unusual turn toward the medium large transport X jet. I then told medium large transport X to maintain FL210. Medium large transport X did not answer. I had to call medium large transport X 4 times to finally get a response to turn left heading 090 degrees immediately and descent west/O delay to FL190, since he had already busted FL210. The adjacent sector turned the military mlt Y right heading 180 degrees to avoid any further loss of sep. Aircraft were then reclred on course. This situation would have never occurred if medium large transport X was monitoring the frequency as required by far regulations. It is impossible to separate an aircraft that will no response to your clrncs.
Original NASA ASRS Text
Title: MLG OFF ARTCC FREQ FOR 4 MINUTES WHILE DESCENDING AND HAD LESS THAN STANDARD SEPARATION WITH MLT FLT. OJT IN PROGRESS AT ARTCC.
Narrative: I AM A TRNEE. I DSNDED MLG X TO FL190 FROM FL230 TO RESOLVE A CONFLICT. THERE WAS A MIL MLT Y HOLDING JUST W OF MY SECTOR AT FL200. THE MIL ACFT TURNED AROUND IN HIS HOLDING PATTERN AND CAME EBND. 1 1/2 MINS AFTER I GAVE THE DSNT CLRNC MY INSTR INTERVENED AND TOOK OVER THE SECTOR. MY INSTR CALLED MLG X 4 TIMES TO TRY AND STOP THE ACFT AT FL210. THE ACFT FINALLY RESPONDED. MY INSTR ALSO TURNED THE ACFT. THE SECTOR W OF ME TURNED THE MIL ACFT ALSO. I BELIEVE THE CONFLICT COULD HAVE EASILY BEEN RESOLVED IF THE MLG X WOULD HAVE ANSWERED MY INSTR ON THE FIRST CALL. SUPPLEMENTAL INFO FROM ACN 161682: AN ADJACENT SECTOR WAS HOLDING FLT OF 2 MLT Y'S IN ORBIT AT IRK 316018 AT FL200 AWAITING 2 RECEIVERS TO CONDUCT AERIAL REFUELING ON AR318. MLG X JET FROM DSM TO STL AT FL230. MLG X WAS ISSUED A DSNT CLRNC TO FL190. THE MIL ACFT THEN MADE AN UNUSUAL TURN TOWARD THE MLG X JET. I THEN TOLD MLG X TO MAINTAIN FL210. MLG X DID NOT ANSWER. I HAD TO CALL MLG X 4 TIMES TO FINALLY GET A RESPONSE TO TURN LEFT HDG 090 DEGS IMMEDIATELY AND DSNT W/O DELAY TO FL190, SINCE HE HAD ALREADY BUSTED FL210. THE ADJACENT SECTOR TURNED THE MIL MLT Y RIGHT HDG 180 DEGS TO AVOID ANY FURTHER LOSS OF SEP. ACFT WERE THEN RECLRED ON COURSE. THIS SITUATION WOULD HAVE NEVER OCCURRED IF MLG X WAS MONITORING THE FREQ AS REQUIRED BY FAR REGS. IT IS IMPOSSIBLE TO SEPARATE AN ACFT THAT WILL NO RESPONSE TO YOUR CLRNCS.
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.