Altitude deviation on descent. Late runway change distracted flight crew.

Attributes
ACN	315090
Time
Date	199509
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 10500 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
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 pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 2700 flight time type : 600
ASRS Report	315090
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 18000 flight time type : 130
ASRS Report	315388
Events
Anomaly	altitude deviation : overshoot 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:

In process of changing runway approachs, flew through altitude of 11000 ft, bottomed out at 10500 ft, immediately at captain's call about altitude brought aircraft back to 11000 ft. We were on delayed vectors by approach. I should have given aircraft to captain while trying to get runway 14R approach out, after having briefed runway 22R. Supplemental information from acn 315388: approach gave us descend to 11000 ft runway 14R. As I looked down to get the new runway information for runway 14R, I heard the altitude alert sound, I looked up and noticed copilot had flown 300 ft below assigned altitude. I told him to get back to 11000 ft as assigned by ATC but by the time recovery was initiated we were at 10500 ft. No conflict with any other aircraft. Visibility was clear, ATC gave conflicting information, we were prepared to land on a certain runway (22R) as advertised by ATIS and change to new runway at last causing a work overload of crew.

Original NASA ASRS Text

Title: ALTDEV ON DSCNT. LATE RWY CHANGE DISTRACTED FLC.

Narrative: IN PROCESS OF CHANGING RWY APCHS, FLEW THROUGH ALT OF 11000 FT, BOTTOMED OUT AT 10500 FT, IMMEDIATELY AT CAPT'S CALL ABOUT ALT BROUGHT ACFT BACK TO 11000 FT. WE WERE ON DELAYED VECTORS BY APCH. I SHOULD HAVE GIVEN ACFT TO CAPT WHILE TRYING TO GET RWY 14R APCH OUT, AFTER HAVING BRIEFED RWY 22R. SUPPLEMENTAL INFO FROM ACN 315388: APCH GAVE US DSND TO 11000 FT RWY 14R. AS I LOOKED DOWN TO GET THE NEW RWY INFO FOR RWY 14R, I HEARD THE ALT ALERT SOUND, I LOOKED UP AND NOTICED COPLT HAD FLOWN 300 FT BELOW ASSIGNED ALT. I TOLD HIM TO GET BACK TO 11000 FT AS ASSIGNED BY ATC BUT BY THE TIME RECOVERY WAS INITIATED WE WERE AT 10500 FT. NO CONFLICT WITH ANY OTHER ACFT. VISIBILITY WAS CLR, ATC GAVE CONFLICTING INFO, WE WERE PREPARED TO LAND ON A CERTAIN RWY (22R) AS ADVERTISED BY ATIS AND CHANGE TO NEW RWY AT LAST CAUSING A WORK OVERLOAD OF CREW.

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.