Narrative:

I was returning to wheeler AFB from the north at approximately XA00 hours. It was may/sun/93 and wheeler tower is closed on sat and sun. As I approached pineapple intersection I called my position and intent to land on runway 6 in the blind on 126.30 (CTAF). Then upon reaching leader field, I reported my position and being established on a left base for runway 6. All the time receiving no other aircraft broadcasts. I made my call turning final for runway 6 and began my descent out of 2000 ft MSL. Just after being established on final my copilot noticed an aircraft approaching out of the south at our 4-5 O'clock position. As I looked over, the aircraft was about 100-150 ft below and 200 ft horizontal to our position. At this point he had noticed us and began a turn to the right to avoid us. Then continued the turn back to the south. (This aircraft was on a standard VFR arrival from the south. I was on a standard VFR north arrival both to runway 6.) I continued on final landing on runway 6 then taxied to the fuel pit. I called flight service on 122.20 for a radio check and received a loud and clear. The other aircraft had now returned from the south and as I taxied back out to run up for my departure the other aircraft now broadcasting on 126.30 and was making his position reports. I called the other aircraft. He apologized, saying it was his fault. We didn't discuss whether his radio was turned down, on the wrong select or wrong frequency. I assumed it was 1 of the 3. I have a much more vigilant scan of the traffic pattern now, especially when the radios are quiet. A copy of wheeler aeronautical club SOP's for arrs included. Also, it may be a good idea for wheeler to have the standard right hand traffic pattern in the SOP for times when the tower is not in operation.

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Original NASA ASRS Text

Title: SMA IN TFC PATTERN AT UNCTLED ARPT HAS NMAC.

Narrative: I WAS RETURNING TO WHEELER AFB FROM THE N AT APPROX XA00 HRS. IT WAS MAY/SUN/93 AND WHEELER TWR IS CLOSED ON SAT AND SUN. AS I APCHED PINEAPPLE INTXN I CALLED MY POS AND INTENT TO LAND ON RWY 6 IN THE BLIND ON 126.30 (CTAF). THEN UPON REACHING LEADER FIELD, I RPTED MY POS AND BEING ESTABLISHED ON A L BASE FOR RWY 6. ALL THE TIME RECEIVING NO OTHER ACFT BROADCASTS. I MADE MY CALL TURNING FINAL FOR RWY 6 AND BEGAN MY DSCNT OUT OF 2000 FT MSL. JUST AFTER BEING ESTABLISHED ON FINAL MY COPLT NOTICED AN ACFT APCHING OUT OF THE S AT OUR 4-5 O'CLOCK POS. AS I LOOKED OVER, THE ACFT WAS ABOUT 100-150 FT BELOW AND 200 FT HORIZ TO OUR POS. AT THIS POINT HE HAD NOTICED US AND BEGAN A TURN TO THE R TO AVOID US. THEN CONTINUED THE TURN BACK TO THE S. (THIS ACFT WAS ON A STANDARD VFR ARR FROM THE S. I WAS ON A STANDARD VFR N ARR BOTH TO RWY 6.) I CONTINUED ON FINAL LNDG ON RWY 6 THEN TAXIED TO THE FUEL PIT. I CALLED FLT SVC ON 122.20 FOR A RADIO CHK AND RECEIVED A LOUD AND CLR. THE OTHER ACFT HAD NOW RETURNED FROM THE S AND AS I TAXIED BACK OUT TO RUN UP FOR MY DEP THE OTHER ACFT NOW BROADCASTING ON 126.30 AND WAS MAKING HIS POS RPTS. I CALLED THE OTHER ACFT. HE APOLOGIZED, SAYING IT WAS HIS FAULT. WE DIDN'T DISCUSS WHETHER HIS RADIO WAS TURNED DOWN, ON THE WRONG SELECT OR WRONG FREQ. I ASSUMED IT WAS 1 OF THE 3. I HAVE A MUCH MORE VIGILANT SCAN OF THE TFC PATTERN NOW, ESPECIALLY WHEN THE RADIOS ARE QUIET. A COPY OF WHEELER AERO CLUB SOP'S FOR ARRS INCLUDED. ALSO, IT MAY BE A GOOD IDEA FOR WHEELER TO HAVE THE STANDARD R HAND TFC PATTERN IN THE SOP FOR TIMES WHEN THE TWR IS NOT IN OP.

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.