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First officer of a B737 set the wrong altimeter setting during descent causing him to level off 1000 ft below assigned.
| Attributes | |
| ACN | 434230 |
| Time | |
| Date | 199904 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mdw.airport |
| State Reference | IL |
| Altitude | msl bound lower : 9000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain Turbulence Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9800 flight time type : 200 |
| ASRS Report | 434230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 18500 |
| ASRS Report | 433356 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued alert flight crew : returned to assigned airspace |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were en route. I was descending from cruise altitude of FL220 down to 10000 ft. During descent check, captain gave me an altimeter setting of what I thought he said was 30.31. I read it back to him, with no further comment from him. Actual setting was 29.31. Upon leveling at 10000 ft, ATC questioned if we were at 10000 ft. By this time we were in heavy rain, turbulence and had just taken a lightning strike. Captain realized my altimeter was set wrong. We told ATC we were correcting back to 10000 ft. No further comment was made from ATC concerning our altitude deviation. Flight continued to mdw and landed.
Original NASA ASRS Text
Title: FO OF A B737 SET THE WRONG ALTIMETER SETTING DURING DSCNT CAUSING HIM TO LEVEL OFF 1000 FT BELOW ASSIGNED.
Narrative: WE WERE ENRTE. I WAS DSNDING FROM CRUISE ALT OF FL220 DOWN TO 10000 FT. DURING DSCNT CHK, CAPT GAVE ME AN ALTIMETER SETTING OF WHAT I THOUGHT HE SAID WAS 30.31. I READ IT BACK TO HIM, WITH NO FURTHER COMMENT FROM HIM. ACTUAL SETTING WAS 29.31. UPON LEVELING AT 10000 FT, ATC QUESTIONED IF WE WERE AT 10000 FT. BY THIS TIME WE WERE IN HVY RAIN, TURB AND HAD JUST TAKEN A LIGHTNING STRIKE. CAPT REALIZED MY ALTIMETER WAS SET WRONG. WE TOLD ATC WE WERE CORRECTING BACK TO 10000 FT. NO FURTHER COMMENT WAS MADE FROM ATC CONCERNING OUR ALTDEV. FLT CONTINUED TO MDW AND LANDED.
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.