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Altitude deviation altitude overshot. Air carrier descending through FL180 does not reset the altimeter and levels off at the assigned altitude on its instruments, but the controllers correctly question their actual altitude.
| Attributes | |
| ACN | 306710 |
| Time | |
| Date | 199506 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 16700 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 306710 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 306709 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Off to 17000 ft we did not change our altimeter setting passing through 18000 ft and this resulted in a leveloff below 17000 ft by approximately 200-250 ft. We had WX and a high workload at the time of this deviation. On flight from dfw to ord, ZAU had us descend from FL370 to FL240 very rapidly to meet an altitude crossing restr. At FL260 we said that the descent would be tight. Center then descended us to 17000 ft. We failed to reset our altitude at FL180. Current altimeter was 29.67 so we leveled off at actual altitude of 16800 ft. We were very busy with duties and WX deviations.
Original NASA ASRS Text
Title: ALTDEV ALT OVERSHOT. ACR DSNDING THROUGH FL180 DOES NOT RESET THE ALTIMETER AND LEVELS OFF AT THE ASSIGNED ALT ON ITS INSTS, BUT THE CTLRS CORRECTLY QUESTION THEIR ACTUAL ALT.
Narrative: OFF TO 17000 FT WE DID NOT CHANGE OUR ALTIMETER SETTING PASSING THROUGH 18000 FT AND THIS RESULTED IN A LEVELOFF BELOW 17000 FT BY APPROX 200-250 FT. WE HAD WX AND A HIGH WORKLOAD AT THE TIME OF THIS DEV. ON FLT FROM DFW TO ORD, ZAU HAD US DSND FROM FL370 TO FL240 VERY RAPIDLY TO MEET AN ALT XING RESTR. AT FL260 WE SAID THAT THE DSCNT WOULD BE TIGHT. CTR THEN DSNDED US TO 17000 FT. WE FAILED TO RESET OUR ALT AT FL180. CURRENT ALTIMETER WAS 29.67 SO WE LEVELED OFF AT ACTUAL ALT OF 16800 FT. WE WERE VERY BUSY WITH DUTIES AND WX DEVS.
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.