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Air carrier medium large transport flight crew heard and read back a wrong altitude. Controller missed erroneous readback and allowed aircraft to enter adjacent airspace without coordination.
| Attributes | |
| ACN | 93716 |
| Time | |
| Date | 198809 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 10000 msl bound upper : 10800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 13 controller supervisory : 2 |
| ASRS Report | 93716 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : overshoot other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
Medium large transport X was descended to 12000'. Medium large transport X read back 10000'. I did not hear the 10000' read back. Only after listening to the tape recording did I know that the wrong altitude was read back. Prior to this altitude, medium large transport X had read back the wrong runway assignment, which I caught. I then transferred the flight to another frequency. At that time, medium large transport X descended below 11000' and an aircraft (medium large transport Y) was climbing out to 10000'. Departure control issued the traffic. Both aircraft were issued turns away from each other. At this time, a data reduction has not been accomplished and I do not know if a loss of standard sep occurred. Medium large transport Y was also told to maintain visual sep from medium large transport X. At what point this occurred, I do not know. Medium large transport X continued and landed west/O incident. Callback conversation with reporter revealed following information. During the facility's investigation of this incident, it was found that at the time that altitude sep was lost, lateral sep existed in the form of course divergence. Reporter was charged with a system deviation for entering departure control's airspace west/O authority/authorized.
Original NASA ASRS Text
Title: ACR MLG FLT CREW HEARD AND READ BACK A WRONG ALT. CTLR MISSED ERRONEOUS READBACK AND ALLOWED ACFT TO ENTER ADJACENT AIRSPACE WITHOUT COORD.
Narrative: MLG X WAS DSNDED TO 12000'. MLG X READ BACK 10000'. I DID NOT HEAR THE 10000' READ BACK. ONLY AFTER LISTENING TO THE TAPE RECORDING DID I KNOW THAT THE WRONG ALT WAS READ BACK. PRIOR TO THIS ALT, MLG X HAD READ BACK THE WRONG RWY ASSIGNMENT, WHICH I CAUGHT. I THEN TRANSFERRED THE FLT TO ANOTHER FREQ. AT THAT TIME, MLG X DSNDED BELOW 11000' AND AN ACFT (MLG Y) WAS CLBING OUT TO 10000'. DEP CTL ISSUED THE TFC. BOTH ACFT WERE ISSUED TURNS AWAY FROM EACH OTHER. AT THIS TIME, A DATA REDUCTION HAS NOT BEEN ACCOMPLISHED AND I DO NOT KNOW IF A LOSS OF STANDARD SEP OCCURRED. MLG Y WAS ALSO TOLD TO MAINTAIN VISUAL SEP FROM MLG X. AT WHAT POINT THIS OCCURRED, I DO NOT KNOW. MLG X CONTINUED AND LANDED W/O INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED FOLLOWING INFO. DURING THE FAC'S INVESTIGATION OF THIS INCIDENT, IT WAS FOUND THAT AT THE TIME THAT ALT SEP WAS LOST, LATERAL SEP EXISTED IN THE FORM OF COURSE DIVERGENCE. RPTR WAS CHARGED WITH A SYS DEVIATION FOR ENTERING DEP CTL'S AIRSPACE W/O AUTH.
Data retrieved from NASA's ASRS site as of August 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.