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Less than standard separation occurred between two aircraft. One aircraft climbing and the other aircraft descending.
| Attributes | |
| ACN | 169220 |
| Time | |
| Date | 199101 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ctr |
| State Reference | MA |
| Altitude | msl bound lower : 13500 msl bound upper : 13500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 2 |
| ASRS Report | 169220 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26400 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure Operational Error |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
While working sector 07 I was involved in an incident involving medium large transport X and large transport Y. Loss of 5 mi or 1000' occurred. I believe the situation occurred due to the slow rate of turn from medium large transport X and my lack of knowledge of the winds aloft. Also a contributing factor was the lack of a procedure between area a and east to have aircraft landing orh at a reasonable altitude entering sector 07 so sector 07 can meet their crossing restricion with the aircraft. Evasive action was taken (turning both medium large transport X and large transport Y) also trying to establish vertical sep between the two aircraft but both actions were not done in a timely manner. Callback conversation with reporter revealed the following information. Reporter stated the incident took place approximately 5 mi west of center VOR. The medium large transport was descending to 11000' and the large transport was climbing to 17000'. The closest point was 4.4 mi and 200'. The WX was clear. The lack of procedures between area a and area east have been resolved. New procedure requires area a to descend aircraft landing at bdr to be at or below 14000' before entering area east.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION OCCURRED BETWEEN TWO ACFT. ONE ACFT CLIMBING AND THE OTHER ACFT DESCENDING.
Narrative: WHILE WORKING SECTOR 07 I WAS INVOLVED IN AN INCIDENT INVOLVING MLG X AND LGT Y. LOSS OF 5 MI OR 1000' OCCURRED. I BELIEVE THE SITUATION OCCURRED DUE TO THE SLOW RATE OF TURN FROM MLG X AND MY LACK OF KNOWLEDGE OF THE WINDS ALOFT. ALSO A CONTRIBUTING FACTOR WAS THE LACK OF A PROC BTWN AREA A AND E TO HAVE ACFT LNDG ORH AT A REASONABLE ALT ENTERING SECTOR 07 SO SECTOR 07 CAN MEET THEIR XING RESTRICION WITH THE ACFT. EVASIVE ACTION WAS TAKEN (TURNING BOTH MLG X AND LGT Y) ALSO TRYING TO ESTABLISH VERT SEP BTWN THE TWO ACFT BUT BOTH ACTIONS WERE NOT DONE IN A TIMELY MANNER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR STATED THE INCIDENT TOOK PLACE APPROX 5 MI W OF CTR VOR. THE MLG WAS DSNDING TO 11000' AND THE LGT WAS CLBING TO 17000'. THE CLOSEST POINT WAS 4.4 MI AND 200'. THE WX WAS CLR. THE LACK OF PROCS BTWN AREA A AND AREA E HAVE BEEN RESOLVED. NEW PROC REQUIRES AREA A TO DSND ACFT LNDG AT BDR TO BE AT OR BELOW 14000' BEFORE ENTERING AREA E.
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.