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Medium large transport flight crew descends below assigned altitude due to altimeter setting error on approach to bos.
| Attributes | |
| ACN | 611978 |
| Time | |
| Date | 200403 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl single value : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 14000 flight time type : 3000 |
| ASRS Report | 611978 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : published procedure non adherence : far non adherence : clearance |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Weather |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Left msp, altimeter setting was 30.62. Upon descent into bos, setting was 29.64. I misset altimeter setting concentrating on last 2 digits. This caused an error of 1000 ft. Controller queried us as to the new setting. Crosschecked with ATIS and reset to new setting. Finally realized we were off by 1 inch altimeter setting or 1000 ft. For some reason we crosschecked all 3 altimeters but failed to check entire setting against ATIS. We finally caught our error, but after the controller stated our mode C was 6000 ft versus our altimeter of 7000 ft. Learned a good lesson -- always xchk with ATIS and ATC for correct altimeter setting, especially when going from or to an unusually high pressure area.
Original NASA ASRS Text
Title: MLG FLT CREW DSNDS BELOW ASSIGNED ALT DUE TO ALTIMETER SETTING ERROR ON APCH TO BOS.
Narrative: LEFT MSP, ALTIMETER SETTING WAS 30.62. UPON DSCNT INTO BOS, SETTING WAS 29.64. I MISSET ALTIMETER SETTING CONCENTRATING ON LAST 2 DIGITS. THIS CAUSED AN ERROR OF 1000 FT. CTLR QUERIED US AS TO THE NEW SETTING. XCHKED WITH ATIS AND RESET TO NEW SETTING. FINALLY REALIZED WE WERE OFF BY 1 INCH ALTIMETER SETTING OR 1000 FT. FOR SOME REASON WE XCHKED ALL 3 ALTIMETERS BUT FAILED TO CHK ENTIRE SETTING AGAINST ATIS. WE FINALLY CAUGHT OUR ERROR, BUT AFTER THE CTLR STATED OUR MODE C WAS 6000 FT VERSUS OUR ALTIMETER OF 7000 FT. LEARNED A GOOD LESSON -- ALWAYS XCHK WITH ATIS AND ATC FOR CORRECT ALTIMETER SETTING, ESPECIALLY WHEN GOING FROM OR TO AN UNUSUALLY HIGH PRESSURE AREA.
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.