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An air carrier flight crew in an medium large transport descended below their assigned altitude because the first officer forgot to reset his altimeter leaving 18000 ft.
| Attributes | |
| ACN | 394120 |
| Time | |
| Date | 199802 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pnt |
| State Reference | IL |
| Altitude | msl bound lower : 10600 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 4000 flight time type : 1200 |
| ASRS Report | 394120 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending into ord first officer had wrong altimeter set leveling off at 11000 ft MSL. First officer was still set to 29.92 when he leveled off at 11000 ft. Captain had correct altimeter set at 29.50 which showed aircraft 400 ft low (10600 ft MSL). First officer changed altimeter setting and immediately corrected back to altitude. ATC made no comment about the situation. Rest of flight was uneventful. In my opinion contributing factors were that we were given a clearance to expedite our descent to 11000 ft, the captain was making an announcement to the passenger, no altimeter setting was copied from the ATIS for a quick reference. As the PF I got too focused on increasing my descent rate that I forgot to reset my altimeter. The captain was busy talking to the passenger so there was no one backing me up for that short period of time.
Original NASA ASRS Text
Title: AN ACR FLC IN AN MLG DSNDED BELOW THEIR ASSIGNED ALT BECAUSE THE FO FORGOT TO RESET HIS ALTIMETER LEAVING 18000 FT.
Narrative: DSNDING INTO ORD FO HAD WRONG ALTIMETER SET LEVELING OFF AT 11000 FT MSL. FO WAS STILL SET TO 29.92 WHEN HE LEVELED OFF AT 11000 FT. CAPT HAD CORRECT ALTIMETER SET AT 29.50 WHICH SHOWED ACFT 400 FT LOW (10600 FT MSL). FO CHANGED ALTIMETER SETTING AND IMMEDIATELY CORRECTED BACK TO ALT. ATC MADE NO COMMENT ABOUT THE SIT. REST OF FLT WAS UNEVENTFUL. IN MY OPINION CONTRIBUTING FACTORS WERE THAT WE WERE GIVEN A CLRNC TO EXPEDITE OUR DSCNT TO 11000 FT, THE CAPT WAS MAKING AN ANNOUNCEMENT TO THE PAX, NO ALTIMETER SETTING WAS COPIED FROM THE ATIS FOR A QUICK REF. AS THE PF I GOT TOO FOCUSED ON INCREASING MY DSCNT RATE THAT I FORGOT TO RESET MY ALTIMETER. THE CAPT WAS BUSY TALKING TO THE PAX SO THERE WAS NO ONE BACKING ME UP FOR THAT SHORT PERIOD OF TIME.
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.