Narrative:

At 1 1/2 mi I reported intent to enter mid-field left downwind runway 31 st augustine. As I neared the field I began to take careful notice of aircraft, their reported position and their actual position at st augustine. A learjet was on final for landing, a cherokee was on crosswind for touch and go and a cherokee was downwind for landing. I positioned my aircraft to enter the left downwind for runway 31 between the cherokee on crosswind and the cherokee presently at mid-field downwind. I entered the left downwind approximately 1/2 mi behind the cherokee with the second cherokee still on crosswind. The second cherokee reported turning downwind runway 31 about 30 seconds later. The cherokee in front of me reported turning left base runway 31 (sgj). I continued downwind. The cherokee in front (on base) reported turning final runway 31 (sgj). Also, other reports were coming from nearby airfields that were assigned unicom 122.8 (evb). Some pilots were calling runway numbers without identing the airport. The radio traffic was quite heavy. The cherokee on final reported again that it was on final for st augustine. I heard an aircraft report 2.5 mi final but did not hear the airport of intended landing. The cherokee that was on final was now at my 10 O'clock position and I reported turning base for runway 31 st augustine and stated that I was #2 to land. As I proceeded on the base leg (about 2/3 down base) at 800 ft MSL, 20 degree flaps, 80 KTS, I looked right and saw the landing lights of the learjet. It was at my approximately altitude at my 2 O'clock position about 1/2 mi away. I banked hard to the right and pitched the nose down. I came around (180 degrees) in a steep right bank descending to 500 ft over the river. I received a radio response that said 'I'm going around,' but no aircraft or airport identify. I continued on the reverse base course for 4-5 mi and returned to the sgj, executed a standard left entry into the pattern for runway 31 sgj. The approach and landing were uneventful. Factors: 1) the learjet did not use recommended pattern entry technique. 2) the radio traffic was heavy. It was difficult to determine aircraft position (ie, which airport). 3) my failure to seek clarification concerning what aircraft had reported 2 1/2 mi final and at which airport. 'Please everyone, use standard entry procedures.'

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Original NASA ASRS Text

Title: PLT OF A PIPER PA28-161 ON A SHORT BASE LEG AT AN UNCTLED ARPT TOOK EVASIVE ACTION BY GIVING WAY TO A LEARJET ON FINAL BY TURNING AWAY AND DSNDING.

Narrative: AT 1 1/2 MI I RPTED INTENT TO ENTER MID-FIELD L DOWNWIND RWY 31 ST AUGUSTINE. AS I NEARED THE FIELD I BEGAN TO TAKE CAREFUL NOTICE OF ACFT, THEIR RPTED POS AND THEIR ACTUAL POS AT ST AUGUSTINE. A LEARJET WAS ON FINAL FOR LNDG, A CHEROKEE WAS ON XWIND FOR TOUCH AND GO AND A CHEROKEE WAS DOWNWIND FOR LNDG. I POSITIONED MY ACFT TO ENTER THE L DOWNWIND FOR RWY 31 BTWN THE CHEROKEE ON XWIND AND THE CHEROKEE PRESENTLY AT MID-FIELD DOWNWIND. I ENTERED THE L DOWNWIND APPROX 1/2 MI BEHIND THE CHEROKEE WITH THE SECOND CHEROKEE STILL ON XWIND. THE SECOND CHEROKEE RPTED TURNING DOWNWIND RWY 31 ABOUT 30 SECONDS LATER. THE CHEROKEE IN FRONT OF ME RPTED TURNING L BASE RWY 31 (SGJ). I CONTINUED DOWNWIND. THE CHEROKEE IN FRONT (ON BASE) RPTED TURNING FINAL RWY 31 (SGJ). ALSO, OTHER RPTS WERE COMING FROM NEARBY AIRFIELDS THAT WERE ASSIGNED UNICOM 122.8 (EVB). SOME PLTS WERE CALLING RWY NUMBERS WITHOUT IDENTING THE ARPT. THE RADIO TFC WAS QUITE HVY. THE CHEROKEE ON FINAL RPTED AGAIN THAT IT WAS ON FINAL FOR ST AUGUSTINE. I HEARD AN ACFT RPT 2.5 MI FINAL BUT DID NOT HEAR THE ARPT OF INTENDED LNDG. THE CHEROKEE THAT WAS ON FINAL WAS NOW AT MY 10 O'CLOCK POS AND I RPTED TURNING BASE FOR RWY 31 ST AUGUSTINE AND STATED THAT I WAS #2 TO LAND. AS I PROCEEDED ON THE BASE LEG (ABOUT 2/3 DOWN BASE) AT 800 FT MSL, 20 DEG FLAPS, 80 KTS, I LOOKED R AND SAW THE LNDG LIGHTS OF THE LEARJET. IT WAS AT MY APPROX ALT AT MY 2 O'CLOCK POS ABOUT 1/2 MI AWAY. I BANKED HARD TO THE R AND PITCHED THE NOSE DOWN. I CAME AROUND (180 DEGS) IN A STEEP R BANK DSNDING TO 500 FT OVER THE RIVER. I RECEIVED A RADIO RESPONSE THAT SAID 'I'M GOING AROUND,' BUT NO ACFT OR ARPT IDENT. I CONTINUED ON THE REVERSE BASE COURSE FOR 4-5 MI AND RETURNED TO THE SGJ, EXECUTED A STANDARD L ENTRY INTO THE PATTERN FOR RWY 31 SGJ. THE APCH AND LNDG WERE UNEVENTFUL. FACTORS: 1) THE LEARJET DID NOT USE RECOMMENDED PATTERN ENTRY TECHNIQUE. 2) THE RADIO TFC WAS HVY. IT WAS DIFFICULT TO DETERMINE ACFT POS (IE, WHICH ARPT). 3) MY FAILURE TO SEEK CLARIFICATION CONCERNING WHAT ACFT HAD RPTED 2 1/2 MI FINAL AND AT WHICH ARPT. 'PLEASE EVERYONE, USE STANDARD ENTRY PROCS.'

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.