Pilot of small aircraft sel aircraft had near midair collision during entry to traffic pattern.

Attributes
ACN	216401
Time
Date	199207
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : apc
State Reference	CA
Altitude	msl bound lower : 1050 msl bound upper : 1050
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : apc
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach landing other other
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	descent : approach landing other other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 467 flight time type : 467
ASRS Report	216401
Person 2
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time none taken : unable
Consequence	Other
Miss Distance	horizontal : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

I was approaching the napa county airport from the south at about 1700 ft about 15 mi out. Bay approach had just ended my flight following and advised me to contact napa tower. I began my descent to tpa (1033). I listen to ATIS for napa and made my initial contact with the tower stating my position as approximately 10 mi south of the airport with ATIS information to land. The tower controller asked me to repeat my position, which I did. I don't remember if I was asked to identify. I was told to report entering downwind for 18R. At 1050 ft and about to enter downwind, I made the call to the tower stating my position. The controller SID I would be #2 to land and asked if I had the traffic on my right. I looked and said I did not and then an small aircraft twin came from my right to left approximately 50 ft ahead of my airplane, climbing slightly. I continued straight on the downwind, the turn continued straight on it's path about 500 ft to my left then turned right (downwind) and about 500 ft above me and we paralleled like that for a few moments. The controller then resequenced me behind another aircraft I believe she said was on base (which I did not have in sight) and then quickly told me to resequence #3 behind the twin. I replied that I would follow the twin. I said and 2 behind the twin. I followed behind the twin on final it was cleared for and did a touch and go and then left the pattern. I landed without further incident. No one spoke to me at napa about the incident and I am not sure anyone knew how close we came to each other.

Original NASA ASRS Text

Title: PLT OF SMA SEL ACFT HAD NMAC DURING ENTRY TO TFC PATTERN.

Narrative: I WAS APCHING THE NAPA COUNTY ARPT FROM THE S AT ABOUT 1700 FT ABOUT 15 MI OUT. BAY APCH HAD JUST ENDED MY FLT FOLLOWING AND ADVISED ME TO CONTACT NAPA TWR. I BEGAN MY DSCNT TO TPA (1033). I LISTEN TO ATIS FOR NAPA AND MADE MY INITIAL CONTACT WITH THE TWR STATING MY POS AS APPROX 10 MI S OF THE ARPT WITH ATIS INFO TO LAND. THE TWR CTLR ASKED ME TO REPEAT MY POS, WHICH I DID. I DON'T REMEMBER IF I WAS ASKED TO IDENT. I WAS TOLD TO RPT ENTERING DOWNWIND FOR 18R. AT 1050 FT AND ABOUT TO ENTER DOWNWIND, I MADE THE CALL TO THE TWR STATING MY POS. THE CTLR SID I WOULD BE #2 TO LAND AND ASKED IF I HAD THE TFC ON MY R. I LOOKED AND SAID I DID NOT AND THEN AN SMA TWIN CAME FROM MY R TO L APPROX 50 FT AHEAD OF MY AIRPLANE, CLBING SLIGHTLY. I CONTINUED STRAIGHT ON THE DOWNWIND, THE TURN CONTINUED STRAIGHT ON IT'S PATH ABOUT 500 FT TO MY L THEN TURNED R (DOWNWIND) AND ABOUT 500 FT ABOVE ME AND WE PARALLELED LIKE THAT FOR A FEW MOMENTS. THE CTLR THEN RESEQUENCED ME BEHIND ANOTHER ACFT I BELIEVE SHE SAID WAS ON BASE (WHICH I DID NOT HAVE IN SIGHT) AND THEN QUICKLY TOLD ME TO RESEQUENCE #3 BEHIND THE TWIN. I REPLIED THAT I WOULD FOLLOW THE TWIN. I SAID AND 2 BEHIND THE TWIN. I FOLLOWED BEHIND THE TWIN ON FINAL IT WAS CLRED FOR AND DID A TOUCH AND GO AND THEN LEFT THE PATTERN. I LANDED WITHOUT FURTHER INCIDENT. NO ONE SPOKE TO ME AT NAPA ABOUT THE INCIDENT AND I AM NOT SURE ANYONE KNEW HOW CLOSE WE CAME TO EACH OTHER.

Data retrieved from NASA's ASRS site as of July 2007 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.