Autoplt overshot altitude in descent.

Attributes
ACN	342760
Time
Date	199607
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : scy airport : dfw
State Reference	TX
Altitude	msl bound lower : 11800 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 200
ASRS Report	342760
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approach cleared us to descend to 11000 ft on the arrival. Approaching 12000 ft they requested we level at 12000 ft. I reset the autoplt altitude window and it overshot 200 ft low (11800 ft). I disengaged the autoplt and manually leveled off. Then dfw said there was traffic below at 11000 ft, but it was ok because he had us in sight. I remember thinking it would be nice if he'd told us. Lesson: pay closer attention to the TCASII. Dfw approach still stinks.

Original NASA ASRS Text

Title: AUTOPLT OVERSHOT ALT IN DSCNT.

Narrative: APCH CLRED US TO DSND TO 11000 FT ON THE ARR. APCHING 12000 FT THEY REQUESTED WE LEVEL AT 12000 FT. I RESET THE AUTOPLT ALT WINDOW AND IT OVERSHOT 200 FT LOW (11800 FT). I DISENGAGED THE AUTOPLT AND MANUALLY LEVELED OFF. THEN DFW SAID THERE WAS TFC BELOW AT 11000 FT, BUT IT WAS OK BECAUSE HE HAD US IN SIGHT. I REMEMBER THINKING IT WOULD BE NICE IF HE'D TOLD US. LESSON: PAY CLOSER ATTN TO THE TCASII. DFW APCH STILL STINKS.

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.