Air carrier X descended below MVA. System error pilot deviation.

Attributes
ACN	136107
Time
Date	199002
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : slc
State Reference	UT
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	136107
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other other : unspecified atc
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Pilot Deviation

Narrative:

Air carrier X was descended to 13000' MSL. The aircraft descended to 12000' MSL in a 13000' minimum vectoring altitude. No evasive action needed because of VFR conditions. Both pilot and controller need to be more aware of correct altitude assignment and pay closer attention for instruction and readback.

Original NASA ASRS Text

Title: ACR X DESCENDED BELOW MVA. SYSTEM ERROR PLT DEVIATION.

Narrative: ACR X WAS DESCENDED TO 13000' MSL. THE ACFT DESCENDED TO 12000' MSL IN A 13000' MINIMUM VECTORING ALT. NO EVASIVE ACTION NEEDED BECAUSE OF VFR CONDITIONS. BOTH PLT AND CTLR NEED TO BE MORE AWARE OF CORRECT ALT ASSIGNMENT AND PAY CLOSER ATTN FOR INSTRUCTION AND READBACK.

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.