Narrative:

Landed at strange airport after tower closed. Focused on taxi to unmarked tie-down area while avoiding crossing other possibly active runways, as other aircraft were in pattern after our landing. No ground personnel or line personnel were on duty. I became distraction and forgot to cancel IFR until approximately 45 mins after parking. Called tul ATC supervisor to apologize after canceling with FSS by phone.

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Original NASA ASRS Text

Title: C340 ACFT LANDED AT UNCTLED ARPT AND PLT FORGOT TO CLOSE OUT IFR FLT PLAN UNTIL 45 MINS LATER.

Narrative: LANDED AT STRANGE ARPT AFTER TWR CLOSED. FOCUSED ON TAXI TO UNMARKED TIE-DOWN AREA WHILE AVOIDING XING OTHER POSSIBLY ACTIVE RWYS, AS OTHER ACFT WERE IN PATTERN AFTER OUR LNDG. NO GND PERSONNEL OR LINE PERSONNEL WERE ON DUTY. I BECAME DISTR AND FORGOT TO CANCEL IFR UNTIL APPROX 45 MINS AFTER PARKING. CALLED TUL ATC SUPVR TO APOLOGIZE AFTER CANCELING WITH FSS BY PHONE.

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.