 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Two air carrier large transport's, one climbing, one descending, are allowed to converge into conflict without altitude separation.
| Attributes | |
| ACN | 88487 |
| Time | |
| Date | 198806 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : rod |
| State Reference | OH |
| Altitude | msl bound lower : 24000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| 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 non radar : 3 controller radar : 3 |
| ASRS Report | 88487 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Large transport X departed ind and after several vectors for spacing was issued a vector 090 degrees to join J29 on course climbing from FL240 and FL280. Large transport Y inbound to cle was proceeding direct to rod descending from FL290 down to FL240. The wind was 355 at 55 KTS, so large transport X's actual track ended up about 115 degrees. When the potential conflict was noticed large transport X was turned to heading 020 degrees for traffic to parallel large transport Y. Large transport X did not seem to be turning, so large transport Y was issued a 120 degree heading and large transport X was issued a 360 degree heading. Both aircraft were asked to expedite their climb and descent. Sep was lost.
Original NASA ASRS Text
Title: TWO ACR LGT'S, ONE CLIMBING, ONE DESCENDING, ARE ALLOWED TO CONVERGE INTO CONFLICT WITHOUT ALT SEPARATION.
Narrative: LGT X DEPARTED IND AND AFTER SEVERAL VECTORS FOR SPACING WAS ISSUED A VECTOR 090 DEGS TO JOIN J29 ON COURSE CLBING FROM FL240 AND FL280. LGT Y INBND TO CLE WAS PROCEEDING DIRECT TO ROD DSNDING FROM FL290 DOWN TO FL240. THE WIND WAS 355 AT 55 KTS, SO LGT X'S ACTUAL TRACK ENDED UP ABOUT 115 DEGS. WHEN THE POTENTIAL CONFLICT WAS NOTICED LGT X WAS TURNED TO HDG 020 DEGS FOR TFC TO PARALLEL LGT Y. LGT X DID NOT SEEM TO BE TURNING, SO LGT Y WAS ISSUED A 120 DEG HDG AND LGT X WAS ISSUED A 360 DEG HDG. BOTH ACFT WERE ASKED TO EXPEDITE THEIR CLB AND DSCNT. SEP WAS LOST.
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.