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Large transport copied wrong altitude to descend to, readback the incorrect altitude and controller didn't catch it. Aircraft was 1000' below minimum vector altitude.
| Attributes | |
| ACN | 169585 |
| Time | |
| Date | 199101 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : slc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 169585 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 140 flight time total : 8000 flight time type : 140 |
| ASRS Report | 169190 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Large transport contacted me. I told him to fly heading 020 intercept slc 180 right descend and maintain one three thousand. Large transport read back heading 020, slc 180 right maintain on two thousand. I did not catch the altitude readback, large transport descended to one two thousand in a one three thousand ft minimum vector altitude area. Supplemental information from acn 169190. Captain read back the clearance, the first officer set 12000' in the altitude reminder window, and the flight descended to 12000'. The controller that issued the clearance did not challenge, or in any way respond to the clearance readback.
Original NASA ASRS Text
Title: LGT COPIED WRONG ALT TO DESCEND TO, READBACK THE INCORRECT ALT AND CTLR DIDN'T CATCH IT. ACFT WAS 1000' BELOW MINIMUM VECTOR ALT.
Narrative: LGT CONTACTED ME. I TOLD HIM TO FLY HDG 020 INTERCEPT SLC 180 R DSND AND MAINTAIN ONE THREE THOUSAND. LGT READ BACK HDG 020, SLC 180 R MAINTAIN ON TWO THOUSAND. I DID NOT CATCH THE ALT READBACK, LGT DSNDED TO ONE TWO THOUSAND IN A ONE THREE THOUSAND FT MINIMUM VECTOR ALT AREA. SUPPLEMENTAL INFO FROM ACN 169190. CAPT READ BACK THE CLRNC, THE F/O SET 12000' IN THE ALT REMINDER WINDOW, AND THE FLT DSNDED TO 12000'. THE CTLR THAT ISSUED THE CLRNC DID NOT CHALLENGE, OR IN ANY WAY RESPOND TO THE CLRNC READBACK.
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.