 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Controller had less than standard separation between mlt overtaking medium large transport at same altitude on converging course.
| Attributes | |
| ACN | 84643 |
| Time | |
| Date | 198804 |
| Day | Thu |
| Place | |
| Locale Reference | atc facility : lkv |
| State Reference | OR |
| Altitude | msl bound lower : 31600 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse |
| Operator | other |
| Make Model Name | Military Transport |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : zse |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : developmental controller : non radar |
| Experience | controller military : 9 controller non radar : 2 |
| ASRS Report | 84643 |
| Person 2 | |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 28308 vertical : 1400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The 2 aircraft involved were on a gradual intercept in an overtake situation. The problem (possible conflict) was identified and necessary action was taken, but not in a timely manner. This was due to out of ordinary traffic situations which also demanded the controller's attention and the descent clearance was issued too late to prevent loss of sep. Callback conversation with reporter revealed the following: reporter is military controller on loan tdy to the FAA and is in developmental status. Reporter was working the D position and was on landline at the time the radar controller saw the impending conflict. Medium large transport was on the arwy and mlt was on direct route overtaking the medium large transport and converging. Turns and descent were given, but not in time to prevent the loss of sep. Traffic advisories were given, but reporter not sure traffic sighted.
Original NASA ASRS Text
Title: CTLR HAD LESS THAN STANDARD SEPARATION BETWEEN MLT OVERTAKING MLG AT SAME ALT ON CONVERGING COURSE.
Narrative: THE 2 ACFT INVOLVED WERE ON A GRADUAL INTERCEPT IN AN OVERTAKE SITUATION. THE PROB (POSSIBLE CONFLICT) WAS IDENTIFIED AND NECESSARY ACTION WAS TAKEN, BUT NOT IN A TIMELY MANNER. THIS WAS DUE TO OUT OF ORDINARY TFC SITUATIONS WHICH ALSO DEMANDED THE CTLR'S ATTN AND THE DSCNT CLRNC WAS ISSUED TOO LATE TO PREVENT LOSS OF SEP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR IS MIL CTLR ON LOAN TDY TO THE FAA AND IS IN DEVELOPMENTAL STATUS. RPTR WAS WORKING THE D POS AND WAS ON LANDLINE AT THE TIME THE RADAR CTLR SAW THE IMPENDING CONFLICT. MLG WAS ON THE ARWY AND MLT WAS ON DIRECT ROUTE OVERTAKING THE MLG AND CONVERGING. TURNS AND DSCNT WERE GIVEN, BUT NOT IN TIME TO PREVENT THE LOSS OF SEP. TFC ADVISORIES WERE GIVEN, BUT RPTR NOT SURE TFC SIGHTED.
Data retrieved from NASA's ASRS site as of August 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.