Narrative:

I was descending into the pattern at fnl from the west. Wind favored runway 15. I; PIC (pilot in command) approached the airport and flew over the numbers 33 at approximately 7000 feet msl. I radioed CTAF that I was approaching runway 15 from the west and would do a 180 to enter the pattern into the left downwind from the warehouse. Since approaching the airport from approximately 3 miles west I had heard no traffic in the pattern or on CTAF. I verified landing lights on; turned my 180 degrees over the warehouse; carefully scanned the upwind; crosswind and downwind pattern legs for traffic; and seeing and hearing none; entered downwind on a 45 just northwest of the warehouse at 6000 feet msl. I proceeded to fly the downwind slow since I had had the power pulled back from the descent and saw no reason to power up for the downwind. At the turn for left base; I announced my left base turn and rolled into the turn. Just as I rolled out of the turn; a 172; 200 feet at my 10 o'clock and approximately 10 feet higher; was just finishing his base turn- at which time he announced his base turn. That was the first radio call I heard from that aircraft. I widened out my base leg; tried to contact the aircraft on the CTAF but heard no reply. After announcing my intention to reenter the pattern I turned a wide upwind; left traffic; and flew a short pattern to an uneventful landing.I believe radio calls from the other aircraft would have prevented the near miss. I also think that I will fly the pattern at higher speeds so it is unlikely that a similar aircraft will overtake me from the rear; if indeed; that's where the other aircraft was. It may have approached from the east on a base leg and not a downwind.it is somewhat disturbing that I do not know where the other aircraft was throughout my pattern; or that someone was even in the airport vicinity. I therefore; cannot say how the situation would be avoided in the future other than timely radio calls by the other aircraft.

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Original NASA ASRS Text

Title: Cessna 182 pilot reported a NMAC with another aircraft on short final to runway.

Narrative: I was descending into the pattern at FNL from the west. Wind favored Runway 15. I; PIC (Pilot in Command) approached the airport and flew over the numbers 33 at approximately 7000 feet msl. I radioed CTAF that I was approaching Runway 15 from the west and would do a 180 to enter the pattern into the left downwind from the warehouse. Since approaching the airport from approximately 3 miles west I had heard no traffic in the pattern or on CTAF. I verified landing lights on; turned my 180 degrees over the warehouse; carefully scanned the upwind; crosswind and downwind pattern legs for traffic; and seeing and hearing none; entered downwind on a 45 just northwest of the warehouse at 6000 feet msl. I proceeded to fly the downwind slow since I had had the power pulled back from the descent and saw no reason to power up for the downwind. At the turn for left base; I announced my left base turn and rolled into the turn. Just as I rolled out of the turn; a 172; 200 feet at my 10 o'clock and approximately 10 feet higher; was just finishing his base turn- at which time he announced his base turn. That was the first radio call I heard from that aircraft. I widened out my base leg; tried to contact the aircraft on the CTAF but heard no reply. After announcing my intention to reenter the pattern I turned a wide upwind; left traffic; and flew a short pattern to an uneventful landing.I believe radio calls from the other aircraft would have prevented the near miss. I also think that I will fly the pattern at higher speeds so it is unlikely that a similar aircraft will overtake me from the rear; if indeed; that's where the other aircraft was. It may have approached from the east on a base leg and not a downwind.It is somewhat disturbing that I do not know where the other aircraft was throughout my pattern; or that someone was even in the airport vicinity. I therefore; cannot say how the situation would be avoided in the future other than timely radio calls by the other aircraft.

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.