Air carrier 80 mi west of iiu cleared descend to FL180. Captain, PNF, off frequency getting ATIS and company information. First officer, PF, noted 250 ft low and corrected back to assigned altitude. Maximum deviation 350 ft.

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Attributes
ACN	349040
Time
Date	199610
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : iiu
State Reference	KY
Altitude	msl bound lower : 17650 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
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 : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 1700
ASRS Report	349044
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : far
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:

Cleared to descend to FL180. Copilot was flying and I advised off ATC to copy ATIS and call in-range. Copilot called 1000 ft to go and I checked this visually. Just as I was reporting back on ATC to copilot he noticed we were 200-250 ft below assigned altitude. He immediately corrected back. We were below by about 350 ft for no more than 20-30 seconds, no conflict reported. ATC then cleared us to maintain 12000 ft.

Original NASA ASRS Text

Title: ACR 80 MI W OF IIU CLRED DSND TO FL180. CAPT, PNF, OFF FREQ GETTING ATIS AND COMPANY INFO. FO, PF, NOTED 250 FT LOW AND CORRECTED BACK TO ASSIGNED ALT. MAX DEV 350 FT.

Narrative: CLRED TO DSND TO FL180. COPLT WAS FLYING AND I ADVISED OFF ATC TO COPY ATIS AND CALL IN-RANGE. COPLT CALLED 1000 FT TO GO AND I CHKED THIS VISUALLY. JUST AS I WAS RPTING BACK ON ATC TO COPLT HE NOTICED WE WERE 200-250 FT BELOW ASSIGNED ALT. HE IMMEDIATELY CORRECTED BACK. WE WERE BELOW BY ABOUT 350 FT FOR NO MORE THAN 20-30 SECONDS, NO CONFLICT RPTED. ATC THEN CLRED US TO MAINTAIN 12000 FT.

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.