Distraction by a system abnormality a flight crew overshoots altitude during descent.

Attributes
ACN	526790
Time
Date	200110
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : pxt.vortac
State Reference	MD
Altitude	msl bound lower : 18700 msl bound upper : 19000
Environment
Flight Conditions	VMC VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 210 flight time total : 16000 flight time type : 5000
ASRS Report	526790
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Was given descent to FL190. Became distraction by system abnormality. Aircraft descended to FL187. Altitude was corrected to FL190.

Original NASA ASRS Text

Title: DISTR BY A SYS ABNORMALITY A FLT CREW OVERSHOOTS ALT DURING DSCNT.

Narrative: WAS GIVEN DSCNT TO FL190. BECAME DISTR BY SYS ABNORMALITY. ACFT DSNDED TO FL187. ALT WAS CORRECTED TO FL190.

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.