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ZOB controller does not ensure lateral separation when vectoring multiple aircraft for en route spacing.
| Attributes | |
| ACN | 520346 |
| Time | |
| Date | 200107 |
| Day | Sun |
| Place | |
| State Reference | MI |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 17 controller time certified in position1 : 5 |
| ASRS Report | 520346 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28800 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 (air carrier X) and aircraft #2 (air carrier Y) both B757's and both going eastbound to bos. I also had another air carrier (a B757) going to bos. I was told that several sectors away, 30 mi in trail was needed going to bos, and was asked if I could get some spacing started. Air carrier Y was about 20 mi due north of air carrier X with air carrier Z about 15 mi behind air carrier X. I turned both air carrier Z and air carrier X to a heading of 010 degrees. About 4 mins later, I noticed air carrier X was not established anywhere north, while air carrier Z was very much northerly. I turned air carrier X back to a heading of 160 degrees and shortly after separation was lost. After reviewing the error, I was informed that there is not 'a standard rate of turn' that controllers could expect. I find it unbelievable that we cannot expect aircraft of similar types and altitudes to perform equally. Once again, the entire burden of responsibility lies entirely on the controller, whether it is phraseology or performance, without some standardization being placed upon pilots.
Original NASA ASRS Text
Title: ZOB CTLR DOES NOT ENSURE LATERAL SEPARATION WHEN VECTORING MULTIPLE ACFT FOR ENRTE SPACING.
Narrative: ACFT #1 (ACR X) AND ACFT #2 (ACR Y) BOTH B757'S AND BOTH GOING EBOUND TO BOS. I ALSO HAD ANOTHER ACR (A B757) GOING TO BOS. I WAS TOLD THAT SEVERAL SECTORS AWAY, 30 MI IN TRAIL WAS NEEDED GOING TO BOS, AND WAS ASKED IF I COULD GET SOME SPACING STARTED. ACR Y WAS ABOUT 20 MI DUE N OF ACR X WITH ACR Z ABOUT 15 MI BEHIND ACR X. I TURNED BOTH ACR Z AND ACR X TO A HDG OF 010 DEGS. ABOUT 4 MINS LATER, I NOTICED ACR X WAS NOT ESTABLISHED ANYWHERE N, WHILE ACR Z WAS VERY MUCH NORTHERLY. I TURNED ACR X BACK TO A HDG OF 160 DEGS AND SHORTLY AFTER SEPARATION WAS LOST. AFTER REVIEWING THE ERROR, I WAS INFORMED THAT THERE IS NOT 'A STANDARD RATE OF TURN' THAT CTLRS COULD EXPECT. I FIND IT UNBELIEVABLE THAT WE CANNOT EXPECT ACFT OF SIMILAR TYPES AND ALTS TO PERFORM EQUALLY. ONCE AGAIN, THE ENTIRE BURDEN OF RESPONSIBILITY LIES ENTIRELY ON THE CTLR, WHETHER IT IS PHRASEOLOGY OR PERFORMANCE, WITHOUT SOME STANDARDIZATION BEING PLACED UPON PLTS.
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.