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ARTCC radar controller vectoring a DC9 and a B737 to avoid a NORDO aircraft and each other, gave a climb to the B737 and then coordination with another sector regarding the NORDO who was now on his frequency. During the coordination, separation was lost between the climbing B737 and the DC9. The conflict alert activated and evasive action was taken, but standard separation was lost.
| Attributes | |
| ACN | 369411 |
| Time | |
| Date | 199705 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : vwv |
| State Reference | OH |
| Altitude | msl bound lower : 33000 msl bound upper : 34500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : instrument |
| Experience | controller radar : 3 flight time total : 250 |
| ASRS Report | 369411 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| 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 : 18000 vertical : 1500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 and aircraft #2 were turned to avoid NORDO aircraft at FL330 wbound. The 2 aircraft were turned to avoid each other also. When the sits were resolved aircraft was given a normal rate of climb instruction. He was previously expediting climb. Aircraft #2 then only climbed 200 ft in about 1 min as NORDO aircraft showed up on frequency and coordination was needed in a timely manner. As coordination was taking place the conflict alert activated. Evasive action was taken again, but not in a timely manner.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR VECTORING A DC9 AND A B737 TO AVOID A NORDO ACFT AND EACH OTHER, GAVE A CLB TO THE B737 AND THEN COORD WITH ANOTHER SECTOR REGARDING THE NORDO WHO WAS NOW ON HIS FREQ. DURING THE COORD, SEPARATION WAS LOST BTWN THE CLBING B737 AND THE DC9. THE CONFLICT ALERT ACTIVATED AND EVASIVE ACTION WAS TAKEN, BUT STANDARD SEPARATION WAS LOST.
Narrative: ACFT #1 AND ACFT #2 WERE TURNED TO AVOID NORDO ACFT AT FL330 WBOUND. THE 2 ACFT WERE TURNED TO AVOID EACH OTHER ALSO. WHEN THE SITS WERE RESOLVED ACFT WAS GIVEN A NORMAL RATE OF CLB INSTRUCTION. HE WAS PREVIOUSLY EXPEDITING CLB. ACFT #2 THEN ONLY CLBED 200 FT IN ABOUT 1 MIN AS NORDO ACFT SHOWED UP ON FREQ AND COORD WAS NEEDED IN A TIMELY MANNER. AS COORD WAS TAKING PLACE THE CONFLICT ALERT ACTIVATED. EVASIVE ACTION WAS TAKEN AGAIN, BUT NOT IN A TIMELY MANNER.
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.