Narrative:

We were arriving aoo at night from the south at 5000 feet. The ASOS reported ceilings at 3600 overcast; 10 miles of visibility; and winds from 310 degrees at 11 knots with gusts to 19. I chose the RNAV/GPS Y runway 3 approach. We figured we would see the airport very shortly after beginning our descent from 5000 feet if not before. After getting into VMC conditions; we would then cancel our IFR flight plan and enter left traffic for runway 30. We communicated this to jst approach. When we arrived at cryss to begin the approach; we had not yet been cleared to do the approach. We asked ATC for the clearance to do the approach; and they issued it. We began our approach; and around 4400 feet; we came into VMC conditions. After getting 500 feet below the clouds; we canceled our IFR flight plan. We entered the left downwind to runway 30; flew the traffic pattern; and landed without incident.after we parked the airplane and deplaned the passengers; the co-pilot and I talked about our arrival. He mentioned that he wasn't sure we could do the RNAV/GPS Y runway 3 approach at night. I felt certain that the only restriction on the approach at night was circling approaches are na. We looked at the chart; and there is a note that says 'procedure na at night'. Somehow; in the midst of our arrival and briefing; I did not read the note.I believe there is one main factor that contributed to this mistake. We are based in aoo. I believe that part of the problem is that my familiarity caused me to become complacent. I've been flying in and out of this airport for a couple years now; and I thought the restriction was no circling approaches at night. The ILS approach to the opposite runway does have that restriction. I believe that I wasn't seriously reading the note because I was complacent and thought I knew what it said. This; combined with the fact that I didn't really expect to have to do much if any of the approach; is why I believe I missed the note.in order to reduce the risk of missing important notes in the future; I plan to verbally brief all of the notes of every approach with the expectation that we will have to fly the approach all the way to minimums and execute the missed approach. I believe this strategy will help me prevent errors like this in the future.

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Original NASA ASRS Text

Title: King Air Captain reported they flew an unauthorized night approach into AOO.

Narrative: We were arriving AOO at night from the south at 5000 feet. The ASOS reported ceilings at 3600 overcast; 10 miles of visibility; and winds from 310 degrees at 11 knots with gusts to 19. I chose the RNAV/GPS Y Runway 3 approach. We figured we would see the airport very shortly after beginning our descent from 5000 feet if not before. After getting into VMC conditions; we would then cancel our IFR flight plan and enter left traffic for runway 30. We communicated this to JST Approach. When we arrived at CRYSS to begin the approach; we had not yet been cleared to do the approach. We asked ATC for the clearance to do the approach; and they issued it. We began our approach; and around 4400 feet; we came into VMC conditions. After getting 500 feet below the clouds; we canceled our IFR flight plan. We entered the left downwind to runway 30; flew the traffic pattern; and landed without incident.After we parked the airplane and deplaned the passengers; the co-pilot and I talked about our arrival. He mentioned that he wasn't sure we could do the RNAV/GPS Y Runway 3 approach at night. I felt certain that the only restriction on the approach at night was circling approaches are NA. We looked at the chart; and there is a note that says 'Procedure NA at night'. Somehow; in the midst of our arrival and briefing; I did not read the note.I believe there is one main factor that contributed to this mistake. We are based in AOO. I believe that part of the problem is that my familiarity caused me to become complacent. I've been flying in and out of this airport for a couple years now; and I thought the restriction was no circling approaches at night. The ILS approach to the opposite runway does have that restriction. I believe that I wasn't seriously reading the note because I was complacent and thought I knew what it said. This; combined with the fact that I didn't really expect to have to do much if any of the approach; is why I believe I missed the note.In order to reduce the risk of missing important notes in the future; I plan to verbally brief all of the notes of every approach with the expectation that we will have to fly the approach all the way to minimums and execute the missed approach. I believe this strategy will help me prevent errors like this in the future.

Data retrieved from NASA's ASRS site 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.