An FK100 descending into ord descended through assigned altitude due to wrong altimeter setting.

Attributes
ACN	425550
Time
Date	199901
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 11000 msl bound upper : 11000
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	425550
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

Altitude deviation. ATC facility: ord approach. Location: ord 200 degree radial, 40 DME. First officer set wrong altimeter setting and I failed to catch it. As a result, we passed through our altitude. We immediately returned to 11000 ft. Approach never said anything. We were only off our altitude for a few seconds.

Original NASA ASRS Text

Title: AN FK100 DSNDING INTO ORD DSNDED THROUGH ASSIGNED ALT DUE TO WRONG ALTIMETER SETTING.

Narrative: ALTDEV. ATC FACILITY: ORD APCH. LOCATION: ORD 200 DEG RADIAL, 40 DME. FO SET WRONG ALTIMETER SETTING AND I FAILED TO CATCH IT. AS A RESULT, WE PASSED THROUGH OUR ALT. WE IMMEDIATELY RETURNED TO 11000 FT. APCH NEVER SAID ANYTHING. WE WERE ONLY OFF OUR ALT FOR A FEW SECONDS.

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.