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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ZOB controller observes potential loss of separation, issues turns and climb clearance, but not before one air carrier initiates TCASII descent resulting in a conflict.
| Attributes | |
| ACN | 507727 |
| Time | |
| Date | 200104 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : eri.airport |
| State Reference | CA |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j584.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : holding |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar controller : supervisor |
| Qualification | controller : radar |
| Experience | controller time certified in position1 : 17 |
| ASRS Report | 507727 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 22000 flight time type : 1000 |
| ASRS Report | 508038 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : required legal separation non adherence : published procedure non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 200 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was busy on the east side of the sector with spacing to ewr/jfk. I had given aircraft #1 a left 360 degree turn for spacing due to aircraft holding at slt. The turn was wider than I expected and he got close to aircraft #2. I descended aircraft #2 immediately to FL350 and then turned and climbed aircraft #1 to a 300 degree heading and FL390. Aircraft #1 instead descended due to a TCASII RA. Aircraft #2 waited 24 seconds before descending. Supplemental information from acn 508036: under ZOB radar controled vector. While en route to slt (J584), ZOB issued us a left 360 degree turn and then direct to slate run (slt). During this turn, we received a TA and then an RA from our TCASII. RA command was to descend. Traffic appeared as '+01.' we complied with this command and then advised ZOB of the conflict and RA on frequency 132.925. We never observed conflicting traffic. Before leaving frequency for a new assignment, I asked ZOB radar control if there was a loss of separation as a result of their vector assignment. They replied 'preliminary indications were affirmative.'
Original NASA ASRS Text
Title: ZOB CTLR OBSERVES POTENTIAL LOSS OF SEPARATION, ISSUES TURNS AND CLB CLRNC, BUT NOT BEFORE ONE ACR INITIATES TCASII DSCNT RESULTING IN A CONFLICT.
Narrative: I WAS BUSY ON THE E SIDE OF THE SECTOR WITH SPACING TO EWR/JFK. I HAD GIVEN ACFT #1 A L 360 DEG TURN FOR SPACING DUE TO ACFT HOLDING AT SLT. THE TURN WAS WIDER THAN I EXPECTED AND HE GOT CLOSE TO ACFT #2. I DSNDED ACFT #2 IMMEDIATELY TO FL350 AND THEN TURNED AND CLBED ACFT #1 TO A 300 DEG HDG AND FL390. ACFT #1 INSTEAD DSNDED DUE TO A TCASII RA. ACFT #2 WAITED 24 SECONDS BEFORE DSNDING. SUPPLEMENTAL INFO FROM ACN 508036: UNDER ZOB RADAR CTLED VECTOR. WHILE ENRTE TO SLT (J584), ZOB ISSUED US A L 360 DEG TURN AND THEN DIRECT TO SLATE RUN (SLT). DURING THIS TURN, WE RECEIVED A TA AND THEN AN RA FROM OUR TCASII. RA COMMAND WAS TO DSND. TFC APPEARED AS '+01.' WE COMPLIED WITH THIS COMMAND AND THEN ADVISED ZOB OF THE CONFLICT AND RA ON FREQ 132.925. WE NEVER OBSERVED CONFLICTING TFC. BEFORE LEAVING FREQ FOR A NEW ASSIGNMENT, I ASKED ZOB RADAR CTL IF THERE WAS A LOSS OF SEPARATION AS A RESULT OF THEIR VECTOR ASSIGNMENT. THEY REPLIED 'PRELIMINARY INDICATIONS WERE AFFIRMATIVE.'
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.