Narrative:

I reported 8 mi out (per my GPS) during a straight in VFR approach to runway 34 descending at about 100 KTS with landing and strobe lights on. I was advised by the tower that I was following a C172 who was on a 3-4 mi final. The C172 was advised to maintain an expedited approach speed. I was scanning for the traffic and at about 5 mi out asked the tower where my traffic was since I did not spot him. Just then the other aircraft; the C172; reported that I passed 10 ft underneath him in the same direction. We both landed without incident. I believe that the primary factor was the incorrect position reporting of the C172 that was ahead of me. As a result; I was scanning ahead toward the runway looking for the traffic rather than near and above where the conflict occurred. If a tower radar were present at redding it would also have provided positive identify and location of traffic. My aircraft is also equipped with a tis (traffic information service) display and would have picked up the target early on to avoid the incident; but there was no service available in that region.

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Original NASA ASRS Text

Title: C182 ON 5 MI VFR STRAIGHT IN APCH TO RDD AT 2000 FT EXPERIENCED NMAC WITH A C172.

Narrative: I RPTED 8 MI OUT (PER MY GPS) DURING A STRAIGHT IN VFR APCH TO RWY 34 DSNDING AT ABOUT 100 KTS WITH LNDG AND STROBE LIGHTS ON. I WAS ADVISED BY THE TWR THAT I WAS FOLLOWING A C172 WHO WAS ON A 3-4 MI FINAL. THE C172 WAS ADVISED TO MAINTAIN AN EXPEDITED APCH SPD. I WAS SCANNING FOR THE TFC AND AT ABOUT 5 MI OUT ASKED THE TWR WHERE MY TFC WAS SINCE I DID NOT SPOT HIM. JUST THEN THE OTHER ACFT; THE C172; RPTED THAT I PASSED 10 FT UNDERNEATH HIM IN THE SAME DIRECTION. WE BOTH LANDED WITHOUT INCIDENT. I BELIEVE THAT THE PRIMARY FACTOR WAS THE INCORRECT POS RPTING OF THE C172 THAT WAS AHEAD OF ME. AS A RESULT; I WAS SCANNING AHEAD TOWARD THE RWY LOOKING FOR THE TFC RATHER THAN NEAR AND ABOVE WHERE THE CONFLICT OCCURRED. IF A TWR RADAR WERE PRESENT AT REDDING IT WOULD ALSO HAVE PROVIDED POSITIVE IDENT AND LOCATION OF TFC. MY ACFT IS ALSO EQUIPPED WITH A TIS (TFC INFO SVC) DISPLAY AND WOULD HAVE PICKED UP THE TARGET EARLY ON TO AVOID THE INCIDENT; BUT THERE WAS NO SVC AVAILABLE IN THAT REGION.

Data retrieved from NASA's ASRS site as of January 2009 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.