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Readback error caused air carrier to descent to altitude that conflicted with another aircraft, resulting in less than standard separation.
| Attributes | |
| ACN | 124722 |
| Time | |
| Date | 198910 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 124722 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Missed read back. Aircraft issued cross thunn intersection 13000' and 250 KTS. The readback was 'cross grame at 10000' and 250 KTS.' if flight crew were held equally responsible for readback errors there would be, in my opinion, fewer readback errors.
Original NASA ASRS Text
Title: READBACK ERROR CAUSED ACR TO DESCENT TO ALT THAT CONFLICTED WITH ANOTHER ACFT, RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: MISSED READ BACK. ACFT ISSUED CROSS THUNN INTXN 13000' AND 250 KTS. THE READBACK WAS 'CROSS GRAME AT 10000' AND 250 KTS.' IF FLT CREW WERE HELD EQUALLY RESPONSIBLE FOR READBACK ERRORS THERE WOULD BE, IN MY OPINION, FEWER READBACK ERRORS.
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.