B737 flight crew had altitude overshoot.

Attributes
ACN	444402
Time
Date	199907
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 8600 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon tower : atl.tower
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 210 flight time total : 21000 flight time type : 500
ASRS Report	444402
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 5000 flight time type : 650
ASRS Report	444010
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	aircraft equipment : altitude alert other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descending from 11000 ft to 9000 ft. We were doing the checklist. Altitude alert beeped. We checked altitude and altimeter indicated 8700 ft. We immediately corrected back to 9000 ft. During recovery, minimum altitude observed was 8600 ft. No further problems and no inquiry from ATC of the deviation. We were doing the checklist later than normal and were distraction from normal duty routine.

Original NASA ASRS Text

Title: B737 FLC HAD ALT OVERSHOOT.

Narrative: DSNDING FROM 11000 FT TO 9000 FT. WE WERE DOING THE CHKLIST. ALT ALERT BEEPED. WE CHKED ALT AND ALTIMETER INDICATED 8700 FT. WE IMMEDIATELY CORRECTED BACK TO 9000 FT. DURING RECOVERY, MINIMUM ALT OBSERVED WAS 8600 FT. NO FURTHER PROBS AND NO INQUIRY FROM ATC OF THE DEV. WE WERE DOING THE CHKLIST LATER THAN NORMAL AND WERE DISTR FROM NORMAL DUTY ROUTINE.

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.