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Controller provides incorrect altimeter setting for medium large transport on descent, medium large transport ends up 500' below assigned altitude.
| Attributes | |
| ACN | 129099 |
| Time | |
| Date | 198911 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gdm airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 5000 flight time type : 210 |
| ASRS Report | 129099 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 13000 flight time type : 210 |
| ASRS Report | 129168 |
| Events | |
| Anomaly | altitude deviation : overshoot other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
Pilot controller readback misunderstanding: pilot read back crossing restriction--altimeter 29.90. Cross bronc at 11000', 250 KTS. At 11000' controller asked altitude and that we showed 500' low. Pilot informed ATC that we were at 11000' and controller gave altitude of 29.00. Controller acknowledged that readback was 29.90 by pilot and that it was the second or third time that day that this had happened to other aircraft.
Original NASA ASRS Text
Title: CTLR PROVIDES INCORRECT ALTIMETER SETTING FOR MLG ON DESCENT, MLG ENDS UP 500' BELOW ASSIGNED ALT.
Narrative: PLT CTLR READBACK MISUNDERSTANDING: PLT READ BACK XING RESTRICTION--ALTIMETER 29.90. CROSS BRONC AT 11000', 250 KTS. AT 11000' CTLR ASKED ALT AND THAT WE SHOWED 500' LOW. PLT INFORMED ATC THAT WE WERE AT 11000' AND CTLR GAVE ALT OF 29.00. CTLR ACKNOWLEDGED THAT READBACK WAS 29.90 BY PLT AND THAT IT WAS THE SECOND OR THIRD TIME THAT DAY THAT THIS HAD HAPPENED TO OTHER ACFT.
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.