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Flight crew believed they had received descent clearance to 5000', read back same, and began descent. Controller acknowledged readback but intended descent to 7000'.
| Attributes | |
| ACN | 116983 |
| Time | |
| Date | 198907 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : gso |
| State Reference | NC |
| Altitude | msl bound lower : 5000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : gso |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 18 flight time total : 8000 flight time type : 1000 |
| ASRS Report | 116983 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance none taken : detected after the fact other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
During vectors and descent for ILS runway 23 approach to gso, nc. Approach controller advised 'turn 10 degree to right, descend and maintain 5000'.' I (PNF) acknowledged instructions and read back 'turn 10 degree to right, descend to maintain 5000'.' the controller acknowledged by readback with '(callsign) roger'. As aircraft was descending thru approximately 6000', the same ATC controller asked if we were assigned 7000'. I responded 'no, we're descending to 5000', that was the altitude I read back'. The controller then stated 'ok, no problem'. After landing, I telephoned the gso radar room supervisor to ask him if there had been a problem and specifically if there had been a violation. The supervisor I spoke with stated that the controller had assigned the aircraft 7000' but that I had read back 5000' and the controller had acknowledged the readback without any correction. The ATC supervisor stated that he would have to listen to the tapes to find out who was at fault and that there was no problem with the incident and that there would be no violation sought.
Original NASA ASRS Text
Title: FLT CREW BELIEVED THEY HAD RECEIVED DESCENT CLRNC TO 5000', READ BACK SAME, AND BEGAN DESCENT. CTLR ACKNOWLEDGED READBACK BUT INTENDED DESCENT TO 7000'.
Narrative: DURING VECTORS AND DSCNT FOR ILS RWY 23 APCH TO GSO, NC. APCH CTLR ADVISED 'TURN 10 DEG TO RIGHT, DSND AND MAINTAIN 5000'.' I (PNF) ACKNOWLEDGED INSTRUCTIONS AND READ BACK 'TURN 10 DEG TO RIGHT, DSND TO MAINTAIN 5000'.' THE CTLR ACKNOWLEDGED BY READBACK WITH '(CALLSIGN) ROGER'. AS ACFT WAS DESCENDING THRU APPROX 6000', THE SAME ATC CTLR ASKED IF WE WERE ASSIGNED 7000'. I RESPONDED 'NO, WE'RE DESCENDING TO 5000', THAT WAS THE ALT I READ BACK'. THE CTLR THEN STATED 'OK, NO PROBLEM'. AFTER LNDG, I TELEPHONED THE GSO RADAR ROOM SUPVR TO ASK HIM IF THERE HAD BEEN A PROBLEM AND SPECIFICALLY IF THERE HAD BEEN A VIOLATION. THE SUPVR I SPOKE WITH STATED THAT THE CTLR HAD ASSIGNED THE ACFT 7000' BUT THAT I HAD READ BACK 5000' AND THE CTLR HAD ACKNOWLEDGED THE READBACK WITHOUT ANY CORRECTION. THE ATC SUPVR STATED THAT HE WOULD HAVE TO LISTEN TO THE TAPES TO FIND OUT WHO WAS AT FAULT AND THAT THERE WAS NO PROBLEM WITH THE INCIDENT AND THAT THERE WOULD BE NO VIOLATION SOUGHT.
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.