The reporter's aircraft descended to an altitude below the assigned altitude.

Attributes
ACN	421760
Time
Date	199811
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : rdu
State Reference	NC
Altitude	msl bound lower : 6000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : rdu
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 6000 flight time type : 1700
ASRS Report	421760
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Level at 6000 ft while being vectored for visual approach, approach control asked what our altitude was. My reply, level at 6000 ft as assigned, he said we should be at 8000 ft.

Original NASA ASRS Text

Title: THE RPTR'S ACFT DSNDED TO AN ALT BELOW THE ASSIGNED ALT.

Narrative: LEVEL AT 6000 FT WHILE BEING VECTORED FOR VISUAL APCH, APCH CTL ASKED WHAT OUR ALT WAS. MY REPLY, LEVEL AT 6000 FT AS ASSIGNED, HE SAID WE SHOULD BE AT 8000 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.