Narrative:

I am flying a skylane 182T with garmin 1000 TCAS and announced my intentions to enter the traffic pattern to aun 10 miles southwest from airport and again at 5 miles. Another aircraft announced entering downwind. A third aircraft made an announcement but was inaudible. I could only catch 'touch and go' (will refer to as aircraft Y). I announced; '2 miles south inbound for runway 25 entering 45; following aircraft on downwind. Aircraft in sight.' there was another announcement from aircraft Y; still inaudible. No audible or visual from TCAS. I proceeded to enter the pattern; slowing down and allowing safe distance from aircraft ahead. Audible alert and visual from TCAS showed aircraft ahead. I then heard another announcement from aircraft Y. The announcement was not clear; but I heard '...in pattern'. Not knowing where the aircraft was; I announced; 'unable to sight aircraft that just made announcement - exiting traffic pattern; making right 360 to re-enter pattern.' immediately after my announcement; aircraft Y announced; 'yeah; we see you. You're 200 ft above us.'what can be done to prevent recurrence: when aircraft Y was making announcements that were inaudible; I should have requested the aircraft to repeat and advise of intentions. I find it peculiar that I did not see the aircraft on TCAS; nor was there an audible alert. I had a passenger with me and neither one of us saw aircraft Y as we were entering the traffic pattern.

Related reports:

Google
 

Original NASA ASRS Text

Title: C182 pilot reports NMAC with another light aircraft during traffic pattern entry at AUN.

Narrative: I am flying a Skylane 182T with Garmin 1000 TCAS and announced my intentions to enter the traffic pattern to AUN 10 miles southwest from airport and again at 5 miles. Another aircraft announced entering downwind. A third aircraft made an announcement but was inaudible. I could only catch 'touch and go' (will refer to as Aircraft Y). I announced; '2 MILES SOUTH INBOUND FOR RUNWAY 25 ENTERING 45; FOLLOWING AIRCRAFT ON DOWNWIND. AIRCRAFT IN SIGHT.' There was another announcement from Aircraft Y; still inaudible. No audible or visual from TCAS. I proceeded to enter the pattern; slowing down and allowing safe distance from Aircraft ahead. Audible alert and visual from TCAS showed Aircraft ahead. I then heard another announcement from Aircraft Y. The announcement was not clear; but I heard '...in pattern'. Not knowing where the aircraft was; I announced; 'unable to sight aircraft that just made announcement - exiting traffic pattern; making right 360 to re-enter pattern.' Immediately after my announcement; Aircraft Y announced; 'Yeah; we see you. You're 200 FT above us.'What can be done to prevent recurrence: When Aircraft Y was making announcements that were inaudible; I should have requested the aircraft to repeat and advise of intentions. I find it peculiar that I did not see the aircraft on TCAS; nor was there an audible alert. I had a passenger with me and neither one of us saw Aircraft Y as we were entering the traffic pattern.

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.