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Approach controller assigned an air carrier MD88 a speed of 180 KTS, which was acknowledged by some aircraft, but not the MD88. When the controller saw an overtake occurring he questioned the MD88 and turned him for separation. Less than standard separation occurred.
| Attributes | |
| ACN | 409209 |
| Time | |
| Date | 199807 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 9500 msl bound upper : 9500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 190 flight time total : 17000 flight time type : 1500 |
| ASRS Report | 409209 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 180 flight time total : 3600 flight time type : 800 |
| ASRS Report | 409575 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 10000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
On descent/approach to atl, ATC asked 'what is your airspeed?' replied '250 KIAS assigned.' atl advised 'I gave you 180 KTS, somebody read it back.' had about 2 mi separation on aircraft ahead, same altitude. Multiple company aircraft on frequency with call signs ending in the same 2 digits as ours. Supplemental information from acn 409575: our last known airspeed assigned by approach was 250 KTS. About the time I was going to ask the captain to ask what speed he (the controller) wanted (because of TCASII I could see we were really starting to close on the aircraft in front of us) our controller became busy with air carrier flight going the wrong way. Before we could ask, he became irritated with us for not flying 180 KTS assigned and told us to turn 30 degrees left. We came within 800 ft and 2 mi of the aircraft preceding us (according to TCASII). We may have missed his assigned airspeed when he gave us an altitude and heading change earlier. Very busy frequency, similar call signs. I need to stay very alert at all times.
Original NASA ASRS Text
Title: APCH CTLR ASSIGNED AN ACR MD88 A SPD OF 180 KTS, WHICH WAS ACKNOWLEDGED BY SOME ACFT, BUT NOT THE MD88. WHEN THE CTLR SAW AN OVERTAKE OCCURRING HE QUESTIONED THE MD88 AND TURNED HIM FOR SEPARATION. LTSS OCCURRED.
Narrative: ON DSCNT/APCH TO ATL, ATC ASKED 'WHAT IS YOUR AIRSPD?' REPLIED '250 KIAS ASSIGNED.' ATL ADVISED 'I GAVE YOU 180 KTS, SOMEBODY READ IT BACK.' HAD ABOUT 2 MI SEPARATION ON ACFT AHEAD, SAME ALT. MULTIPLE COMPANY ACFT ON FREQ WITH CALL SIGNS ENDING IN THE SAME 2 DIGITS AS OURS. SUPPLEMENTAL INFO FROM ACN 409575: OUR LAST KNOWN AIRSPD ASSIGNED BY APCH WAS 250 KTS. ABOUT THE TIME I WAS GOING TO ASK THE CAPT TO ASK WHAT SPD HE (THE CTLR) WANTED (BECAUSE OF TCASII I COULD SEE WE WERE REALLY STARTING TO CLOSE ON THE ACFT IN FRONT OF US) OUR CTLR BECAME BUSY WITH ACR FLT GOING THE WRONG WAY. BEFORE WE COULD ASK, HE BECAME IRRITATED WITH US FOR NOT FLYING 180 KTS ASSIGNED AND TOLD US TO TURN 30 DEGS L. WE CAME WITHIN 800 FT AND 2 MI OF THE ACFT PRECEDING US (ACCORDING TO TCASII). WE MAY HAVE MISSED HIS ASSIGNED AIRSPD WHEN HE GAVE US AN ALT AND HEADING CHANGE EARLIER. VERY BUSY FREQ, SIMILAR CALL SIGNS. I NEED TO STAY VERY ALERT AT ALL TIMES.
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.