Narrative:

My student and I made a normal approach from the southwest to the 45 to left downwind runway 28. We announced our position about 1-2 miles out from the downwind. We were at 1;150 MSL which is about 1;000 AGL. We heard a king air report 6 miles north of runway 28; and he said he'd overfly the runway and enter the traffic pattern for runway 28. He said he'd overfly at 1;600 MSL. We turned onto left downwind at midfield. About that time the king air announced they were midfield left downwind for 28. We replied that we were at the same location at 1;150 ft; and asked him to confirm his position. He said something to the effect that things were okay and he'd 'keep it in tight'. I assumed (incorrectly) that he'd make an aim recommended approach and circle around to the 45; descend; and follow us in. But when he said he'd keep it in tight I started to wonder why he'd say that if he was behind us. It turned out he turned directly onto left downwind after crossing the runway southbound; which put him on downwind above us (which at the time we were unaware of). We'd started our descent to land when we were abeam the numbers; and were just turning left base for 28 when the king air came over the top of us; from behind; also making a left turn to base. His descent rate and bank angle appeared excessive from our viewpoint; but as we were in about a 25 degree bank; it's hard to tell exactly what his flight attitude was. It looked very unusual; especially as he was about 50 yards ahead of us at that point. It looked so odd that I asked my student if the king air was crashing. The king air kept his turn going; rolled out on final; and landed. I mentioned to him on CTAF that 'he just about took the tips off our prop'. He said he thought I was midfield downwind; as that was what I announced. I was when I made the call; but of course at 90 KTS we didn't remain there. I made one more call and mentioned his tail number; and the radios were quiet after that. We finished our turn to final; did a touch and go; and departed back to our home field.

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Original NASA ASRS Text

Title: C172 Instructor with student reports NMAC with King Air during base turn at uncontrolled airport. Both pilots had reported the same position at different altitudes a minute earlier but the reporter did not have the King Air in sight until it descended and pulled ahead during the turn.

Narrative: My student and I made a normal approach from the southwest to the 45 to left downwind Runway 28. We announced our position about 1-2 miles out from the downwind. We were at 1;150 MSL which is about 1;000 AGL. We heard a King Air report 6 miles north of Runway 28; and he said he'd overfly the runway and enter the traffic pattern for Runway 28. He said he'd overfly at 1;600 MSL. We turned onto left downwind at midfield. About that time the King Air announced they were midfield left downwind for 28. We replied that we were at the same location at 1;150 FT; and asked him to confirm his position. He said something to the effect that things were okay and he'd 'keep it in tight'. I assumed (incorrectly) that he'd make an AIM recommended approach and circle around to the 45; descend; and follow us in. But when he said he'd keep it in tight I started to wonder why he'd say that if he was behind us. It turned out he turned directly onto left downwind after crossing the runway southbound; which put him on downwind above us (which at the time we were unaware of). We'd started our descent to land when we were abeam the numbers; and were just turning left base for 28 when the King Air came over the top of us; from behind; also making a left turn to base. His descent rate and bank angle appeared excessive from our viewpoint; but as we were in about a 25 degree bank; it's hard to tell exactly what his flight attitude was. It looked very unusual; especially as he was about 50 yards ahead of us at that point. It looked so odd that I asked my student if the King Air was crashing. The King Air kept his turn going; rolled out on final; and landed. I mentioned to him on CTAF that 'he just about took the tips off our prop'. He said he thought I was midfield downwind; as that was what I announced. I was when I made the call; but of course at 90 KTS we didn't remain there. I made one more call and mentioned his tail number; and the radios were quiet after that. We finished our turn to final; did a touch and go; and departed back to our home field.

Data retrieved from NASA's ASRS site as of April 2012 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.