|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : sat|
|Altitude||msl bound lower : 1200|
msl bound upper : 2600
|Controlling Facilities||tracon : sat|
|Operator||general aviation : corporate|
|Make Model Name||Light Transport, Low Wing, 2 Turbojet Eng|
|Flight Phase||descent : approach|
|Route In Use||enroute : on vectors|
|Affiliation||government : faa|
|Function||controller : approach|
|Qualification||controller : radar|
|Experience||controller non radar : 9|
controller radar : 5
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Anomaly||non adherence : published procedure|
other spatial deviation
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : took evasive action|
|Consequence||faa : investigated|
|Primary Problem||ATC Human Performance|
|Air Traffic Incident||Operational Error|
I was vectoring the aircraft for a surveillance approach to a secondary runway (at pilots request). Since I am a staff specialist it had been some time since I had done a surveillance approach. At approximately 10 mi from the airport after receiving descent clearance to 3000, the pilot asked if he could continue down to 1200 (the min descent altitude). I wrongly approved the request and the aircraft crossed the 5 mi mark level at 1200 (the MVA is 2600). The pilot indicated that when he broke out of the clouds he was in proximity to some antennas that appeared to be at his altitude. The height of the antennas is believed to be 1349 ft. Causal factors: controller (myself) not proficient. I read the wrong MDA off the display in TRACON. Correct MDA is 1280 to 1200. Although volume of traffic was not heavy I had 2 distrs (an aircraft with no transponder, decombining radar positions) which diverted my attention. After I issued incorrect altitude, the data block (track) went into coast.
Original NASA ASRS Text
Title: APCH CTLR DSNDED CPR X BELOW MVA WHILE ON A RADAR SURVEILLANCE APCH. SYS ERROR.
Narrative: I WAS VECTORING THE ACFT FOR A SURVEILLANCE APCH TO A SECONDARY RWY (AT PLTS REQUEST). SINCE I AM A STAFF SPECIALIST IT HAD BEEN SOME TIME SINCE I HAD DONE A SURVEILLANCE APCH. AT APPROX 10 MI FROM THE ARPT AFTER RECEIVING DSCNT CLRNC TO 3000, THE PLT ASKED IF HE COULD CONTINUE DOWN TO 1200 (THE MIN DSCNT ALT). I WRONGLY APPROVED THE REQUEST AND THE ACFT CROSSED THE 5 MI MARK LEVEL AT 1200 (THE MVA IS 2600). THE PLT INDICATED THAT WHEN HE BROKE OUT OF THE CLOUDS HE WAS IN PROXIMITY TO SOME ANTENNAS THAT APPEARED TO BE AT HIS ALT. THE HEIGHT OF THE ANTENNAS IS BELIEVED TO BE 1349 FT. CAUSAL FACTORS: CTLR (MYSELF) NOT PROFICIENT. I READ THE WRONG MDA OFF THE DISPLAY IN TRACON. CORRECT MDA IS 1280 TO 1200. ALTHOUGH VOLUME OF TFC WAS NOT HVY I HAD 2 DISTRS (AN ACFT WITH NO TRANSPONDER, DECOMBINING RADAR POSITIONS) WHICH DIVERTED MY ATTN. AFTER I ISSUED INCORRECT ALT, THE DATA BLOCK (TRACK) WENT INTO COAST.
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.