Cleared to descend to 11000 ft. Altimeter setting should have been 29 pt 16. Forgot to reset altimeters and descended 800 ft too far.

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Attributes
ACN	367610
Time
Date	199704
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : jvl airport : ord
State Reference	WI
Altitude	msl bound lower : 10200 msl bound upper : 11000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	367610
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	367525
Events
Anomaly	altitude deviation : overshoot inflight encounter : weather non adherence : published procedure non adherence : clearance
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:

Instructed to expedite descent over jvl for immediate approach into ord. We were entering holding with an efc time 45 mins to go. During descent we were circumnaving severe thunderstorms in moderate turbulence. WX distrs caused getting the ATIS going through FL180. Heard ATC give current setting so I continued to copy ATIS. Upon leveling off, the mistake was noticed. The altimeter setting for ord was 29.16 which put us below 11000 ft. We corrected our altitude while talking to ATC. No remarks from ATC.

Original NASA ASRS Text

Title: CLRED TO DSND TO 11000 FT. ALTIMETER SETTING SHOULD HAVE BEEN 29 PT 16. FORGOT TO RESET ALTIMETERS AND DSNDED 800 FT TOO FAR.

Narrative: INSTRUCTED TO EXPEDITE DSCNT OVER JVL FOR IMMEDIATE APCH INTO ORD. WE WERE ENTERING HOLDING WITH AN EFC TIME 45 MINS TO GO. DURING DSCNT WE WERE CIRCUMNAVING SEVERE TSTMS IN MODERATE TURB. WX DISTRS CAUSED GETTING THE ATIS GOING THROUGH FL180. HEARD ATC GIVE CURRENT SETTING SO I CONTINUED TO COPY ATIS. UPON LEVELING OFF, THE MISTAKE WAS NOTICED. THE ALTIMETER SETTING FOR ORD WAS 29.16 WHICH PUT US BELOW 11000 FT. WE CORRECTED OUR ALT WHILE TALKING TO ATC. NO REMARKS FROM ATC.

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.