Narrative:

I was working a combined low altitude sector, the pasco approach control facility was closed. I was providing radar vectors to ILS apches at psc and alw. It had been several months since my last opportunity to perform this service. I was using an adjacent pvd to monitor the approachs, with the range set on 60 NM, mia map on, however, overhead charts were 4 bays away forcing me to divert my attention from the pvd to refer to the charts. Due to the combined position my main pvd was set at 200 NM, and visually switching back and forth between the two, I inadvertently lined the aircraft up for and cleared the aircraft for approach to the wrong airport. Rld, wa, and psc, wa, are 4 NM apart, our maps display both localizer courses, numerous mia lines are in the vicinity of both airports. Fortunately the pilots were able to proceed to psc visually, even though they were lined up for rld. I did not observe the aircraft descend below the mia until they canceled IFR, however the potential for a major problem does exist.

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Original NASA ASRS Text

Title: RPTR VECTORED AND CLRED A BE02 FOR APCH TO THE RLD ARPT WHICH IS 4 MI FROM PSC, THE DEST ARPT. THE FLC CAUGHT THE MISTAKE AND WERE ABLE TO PROCEED VISUALLY TO PSC.

Narrative: I WAS WORKING A COMBINED LOW ALT SECTOR, THE PASCO APCH CTL FACILITY WAS CLOSED. I WAS PROVIDING RADAR VECTORS TO ILS APCHES AT PSC AND ALW. IT HAD BEEN SEVERAL MONTHS SINCE MY LAST OPPORTUNITY TO PERFORM THIS SVC. I WAS USING AN ADJACENT PVD TO MONITOR THE APCHS, WITH THE RANGE SET ON 60 NM, MIA MAP ON, HOWEVER, OVERHEAD CHARTS WERE 4 BAYS AWAY FORCING ME TO DIVERT MY ATTN FROM THE PVD TO REFER TO THE CHARTS. DUE TO THE COMBINED POS MY MAIN PVD WAS SET AT 200 NM, AND VISUALLY SWITCHING BACK AND FORTH BTWN THE TWO, I INADVERTENTLY LINED THE ACFT UP FOR AND CLRED THE ACFT FOR APCH TO THE WRONG ARPT. RLD, WA, AND PSC, WA, ARE 4 NM APART, OUR MAPS DISPLAY BOTH LOC COURSES, NUMEROUS MIA LINES ARE IN THE VICINITY OF BOTH ARPTS. FORTUNATELY THE PLTS WERE ABLE TO PROCEED TO PSC VISUALLY, EVEN THOUGH THEY WERE LINED UP FOR RLD. I DID NOT OBSERVE THE ACFT DSND BELOW THE MIA UNTIL THEY CANCELED IFR, HOWEVER THE POTENTIAL FOR A MAJOR PROB DOES EXIST.

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.