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Air carrier medium large transport flight crew in level flight moved barometer set of altitude alert referencing altimeter causing altitude alert to sound. Flight crew concerned may have caused deviation in mode C altitude readout.
| Attributes | |
| ACN | 89878 |
| Time | |
| Date | 198806 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : stl |
| State Reference | MO |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 120 flight time total : 8000 flight time type : 280 |
| ASRS Report | 89878 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 5000 |
| ASRS Report | 90058 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
While level at 10000', I set my altimeter to read zero on the ground (per company procedure). After this I mistakenly moved altimeter set knob on center altimeter and altitude alert went off. We never left 10000', but the indication may have been different. I immediately returned altimeter knob to previous setting.
Original NASA ASRS Text
Title: ACR MLG FLT CREW IN LEVEL FLT MOVED BAROMETER SET OF ALT ALERT REFERENCING ALTIMETER CAUSING ALT ALERT TO SOUND. FLT CREW CONCERNED MAY HAVE CAUSED DEVIATION IN MODE C ALT READOUT.
Narrative: WHILE LEVEL AT 10000', I SET MY ALTIMETER TO READ ZERO ON THE GND (PER COMPANY PROC). AFTER THIS I MISTAKENLY MOVED ALTIMETER SET KNOB ON CENTER ALTIMETER AND ALT ALERT WENT OFF. WE NEVER LEFT 10000', BUT THE INDICATION MAY HAVE BEEN DIFFERENT. I IMMEDIATELY RETURNED ALTIMETER KNOB TO PREVIOUS SETTING.
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.