ZTL controller descends LR35 below MVA during vectors for an ILS runway 1 at ukf.

Attributes
ACN	664687
Time
Date	200507
Place
Locale Reference	airport : ukf.airport
State Reference	NC
Altitude	msl single value : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	general aviation : personal
Make Model Name	Learjet 35
Operating Under FAR Part	Part 121
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 23
ASRS Report	664687
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : published procedure
Independent Detector	atc equipment : msaw other controllera
Resolutory Action	controller : issued alert controller : issued new clearance
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

I was vectoring the lear for an ILS runway 21 at ukf. The MSAW went off. I told the lear to check altitude; maintain 4300 ft. They said they were assigned 3400 ft. I had 4300 ft in the data block. I looked at the strip and I had written 3400 ft. So it was probably confusion on my part. Possible reasons for the confusion: 1) when I took the handoff I had it in my head that they were landing at hky. The MVA around hky is 3400 ft. I caught the destination but may still have had 3400 ft in my mind. Lack of sleep. I was working the XA30-XI30 shift. I had trouble getting to sleep so I didn't have more than 4 hours sleep. It's been a long time since I've worked multiple approachs. I had 2 other aircraft shooting approachs into hky. Both of the initial approach altitudes for them were 3400. I had a d-side at the time (another unfamiliar situation at that sector) and he didn't catch it either.

Original NASA ASRS Text

Title: ZTL CTLR DSNDS LR35 BELOW MVA DURING VECTORS FOR AN ILS RWY 1 AT UKF.

Narrative: I WAS VECTORING THE LEAR FOR AN ILS RWY 21 AT UKF. THE MSAW WENT OFF. I TOLD THE LEAR TO CHK ALT; MAINTAIN 4300 FT. THEY SAID THEY WERE ASSIGNED 3400 FT. I HAD 4300 FT IN THE DATA BLOCK. I LOOKED AT THE STRIP AND I HAD WRITTEN 3400 FT. SO IT WAS PROBABLY CONFUSION ON MY PART. POSSIBLE REASONS FOR THE CONFUSION: 1) WHEN I TOOK THE HDOF I HAD IT IN MY HEAD THAT THEY WERE LNDG AT HKY. THE MVA AROUND HKY IS 3400 FT. I CAUGHT THE DEST BUT MAY STILL HAVE HAD 3400 FT IN MY MIND. LACK OF SLEEP. I WAS WORKING THE XA30-XI30 SHIFT. I HAD TROUBLE GETTING TO SLEEP SO I DIDN'T HAVE MORE THAN 4 HRS SLEEP. IT'S BEEN A LONG TIME SINCE I'VE WORKED MULTIPLE APCHS. I HAD 2 OTHER ACFT SHOOTING APCHS INTO HKY. BOTH OF THE INITIAL APCH ALTS FOR THEM WERE 3400. I HAD A D-SIDE AT THE TIME (ANOTHER UNFAMILIAR SIT AT THAT SECTOR) AND HE DIDN'T CATCH IT EITHER.

Data retrieved from NASA's ASRS site as of January 2009 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.