First officer of an large transport misset the FMC descent altitude causing the aircraft to overshoo...

Attributes
ACN	335733
Time
Date	199605
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 12000 flight time type : 4000
ASRS Report	335733
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approach gave us 210 KTS and 11000 ft in one clearance. PNF read back clearance correctly. PF put 10000 ft in altitude window for FMS autoplt. PNF thought 11000 ft was set in window, but questioned PF, said we were cleared to 10000 ft. By the time crew could question ATC the aircraft already was at 10000 ft. I don't know if 210 KT speed plus 11000 ft in one clearance confused PF. I should have turned off autoplt and leveled off while we tried and cleared up clearance with approach. And I always confirmed altitude set in FMS window. I don't know what happened this time.

Original NASA ASRS Text

Title: FO OF AN LGT MISSET THE FMC DSCNT ALT CAUSING THE ACFT TO OVERSHOOT ASSIGNED ALT.

Narrative: APCH GAVE US 210 KTS AND 11000 FT IN ONE CLRNC. PNF READ BACK CLRNC CORRECTLY. PF PUT 10000 FT IN ALT WINDOW FOR FMS AUTOPLT. PNF THOUGHT 11000 FT WAS SET IN WINDOW, BUT QUESTIONED PF, SAID WE WERE CLRED TO 10000 FT. BY THE TIME CREW COULD QUESTION ATC THE ACFT ALREADY WAS AT 10000 FT. I DON'T KNOW IF 210 KT SPD PLUS 11000 FT IN ONE CLRNC CONFUSED PF. I SHOULD HAVE TURNED OFF AUTOPLT AND LEVELED OFF WHILE WE TRIED AND CLRED UP CLRNC WITH APCH. AND I ALWAYS CONFIRMED ALT SET IN FMS WINDOW. I DON'T KNOW WHAT HAPPENED THIS TIME.

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.

First officer of an large transport misset the FMC descent altitude causing the aircraft to overshoot assigned altitude.