Assigned altitude below MVA. System error.

Attributes
ACN	154598
Time
Date	199008
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : geg
State Reference	WA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : geg tower : dal
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller non radar : 6 controller radar : 6
ASRS Report	154598
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Within the first hour of my assigned shift, while working east radar, I realized small transport X off of felts field (satellite airport) to maintain 5000' due to overflying aircraft at 6000'. When traffic was no longer a factor, I thought I had cancelled the 5000' altitude restriction on small transport X and advised him upon reaching 5000' to turn on course. Apparently, I had not cancelled the restriction (altitude) and possibly caused the aircraft to enter a higher MVA. The pilot later called the facility requesting tapes and all other information. This error occurred after an 8 hour quick turn in which adequate rest was a factor.

Original NASA ASRS Text

Title: ASSIGNED ALT BELOW MVA. SYSTEM ERROR.

Narrative: WITHIN THE FIRST HR OF MY ASSIGNED SHIFT, WHILE WORKING E RADAR, I REALIZED SMT X OFF OF FELTS FIELD (SATELLITE ARPT) TO MAINTAIN 5000' DUE TO OVERFLYING ACFT AT 6000'. WHEN TFC WAS NO LONGER A FACTOR, I THOUGHT I HAD CANCELLED THE 5000' ALT RESTRICTION ON SMT X AND ADVISED HIM UPON REACHING 5000' TO TURN ON COURSE. APPARENTLY, I HAD NOT CANCELLED THE RESTRICTION (ALT) AND POSSIBLY CAUSED THE ACFT TO ENTER A HIGHER MVA. THE PLT LATER CALLED THE FAC REQUESTING TAPES AND ALL OTHER INFO. THIS ERROR OCCURRED AFTER AN 8 HR QUICK TURN IN WHICH ADEQUATE REST WAS A FACTOR.

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.