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Departure controller handling traffic off the same runway recognized loss of separation at cvg with failed spacing between a B737 departing behind a D328 jet.
| Attributes | |
| ACN | 619189 |
| Time | |
| Date | 200405 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : cvg.airport |
| State Reference | KY |
| Altitude | msl single value : 4200 |
| Environment | |
| Flight Conditions | Marginal |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : cvg.tracon tower : aus.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Do 328 TP (Turboprop) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : cvg.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Experience | controller limited radar : 14 controller military : 4 controller non radar : 14 controller radar : 14 controller time certified in position1 : 3 |
| ASRS Report | 619189 |
| Person 2 | |
| Affiliation | company : air carrier company other government : faa government other other Other |
| Function | observation : air carrier inspector oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical inflight encounter : weather non adherence : published procedure non adherence : required legal separation other spatial deviation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar / mode c |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 1500 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance Aircraft Flight Crew Human Performance Weather |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Inter Facility Coordination Failure |
Narrative:
During inclement WX (thunderstorms surrounding cvg from the southeast to west to north) aircraft X departed runway 18L. Given an initial heading of 090 degrees to miss WX, talking to departure south. Aircraft Y departed runway 18L after aircraft X, given an initial heading of 110 degrees to miss WX and diverge from aircraft X and talking to me at departure north. It appeared to me that aircraft X did a reduced power takeoff and a slow turn to 090 degrees and aircraft Y did a normal takeoff and standard turn to 110 degrees. The end result was when I first actively observed the aircraft, they were less than a mi apart on very nearly the same ground track and about 500 ft vertical. I checked to see if aircraft Y was on frequency (he was, but hadn't checked on yet). I then issued a traffic alert to aircraft Y and turned him to 180 degrees to avoid the traffic. I believe aircraft X's reduced power takeoff was a major factor.
Original NASA ASRS Text
Title: DEP CTLR HANDLING TFC OFF THE SAME RWY RECOGNIZED LOSS OF SEPARATION AT CVG WITH FAILED SPACING BTWN A B737 DEPARTING BEHIND A D328 JET.
Narrative: DURING INCLEMENT WX (TSTMS SURROUNDING CVG FROM THE SE TO W TO N) ACFT X DEPARTED RWY 18L. GIVEN AN INITIAL HDG OF 090 DEGS TO MISS WX, TALKING TO DEP S. ACFT Y DEPARTED RWY 18L AFTER ACFT X, GIVEN AN INITIAL HDG OF 110 DEGS TO MISS WX AND DIVERGE FROM ACFT X AND TALKING TO ME AT DEP N. IT APPEARED TO ME THAT ACFT X DID A REDUCED PWR TKOF AND A SLOW TURN TO 090 DEGS AND ACFT Y DID A NORMAL TKOF AND STANDARD TURN TO 110 DEGS. THE END RESULT WAS WHEN I FIRST ACTIVELY OBSERVED THE ACFT, THEY WERE LESS THAN A MI APART ON VERY NEARLY THE SAME GND TRACK AND ABOUT 500 FT VERT. I CHKED TO SEE IF ACFT Y WAS ON FREQ (HE WAS, BUT HADN'T CHKED ON YET). I THEN ISSUED A TFC ALERT TO ACFT Y AND TURNED HIM TO 180 DEGS TO AVOID THE TFC. I BELIEVE ACFT X'S REDUCED PWR TKOF WAS A MAJOR FACTOR.
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.