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Medium large transport read back wrong altitude and controller did not catch the mistake. Medium large transport descended to same altitude as light transport with less than standard separation.
| Attributes | |
| ACN | 86694 |
| Time | |
| Date | 198805 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : eno |
| State Reference | DE |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : zdc |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Light Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 19 |
| ASRS Report | 86694 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance 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 : 22800 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Light transport Y at 10000', wbound, level. Medium large transport X at 15000' descending to 11000', reducing to 250K and read back 10000'. Controller did not hear readback. Aircraft passed 12 O'clock, 3 mi, with 1000'. Then, as mileage increased, altitude was lost.
Original NASA ASRS Text
Title: MLG READ BACK WRONG ALT AND CTLR DID NOT CATCH THE MISTAKE. MLG DESCENDED TO SAME ALT AS LTT WITH LESS THAN STANDARD SEPARATION.
Narrative: LTT Y AT 10000', WBOUND, LEVEL. MLG X AT 15000' DSNDING TO 11000', REDUCING TO 250K AND READ BACK 10000'. CTLR DID NOT HEAR READBACK. ACFT PASSED 12 O'CLOCK, 3 MI, WITH 1000'. THEN, AS MILEAGE INCREASED, ALT WAS LOST.
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.