Narrative:

Aircraft #1 level cruise 4500 ft, 120 KTS, heading 215 degrees, radar advisories, flight following with grk approach assigned discrete squawk. Grk advised aircraft #1 of aircraft #2 overtaking at 190 KTS from 5 O'clock position at 4500 ft, no radio contact, squawk 1200, at 5 mi. Aircraft #1 acquired visual contact at about 2.5 mi, constant bearing and decreasing range. Advised grk approach of visual contact. When closure decreased to between 800-600 ft horizontally, aircraft #1 executed a diving right bank evasive maneuver. Aircraft #1 rolled wings level, idented aircraft #2 as a 300 series cessna twin propeller and reported same to grk approach. Grk approach noted no change in aircraft #2's speed, altitude, or heading at any time. Grk approach radar 'tagged' aircraft #2 and alerted aus approach of incoming aircraft #2 for identify and further investigation. PIC of aircraft #1 called aus approach on telephone and informed that C340 PIC never saw aircraft #1, did not talk or squawk with grk approach. No explanation offered for lack of due diligence.

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Original NASA ASRS Text

Title: A PA28 ATP PLT DIVES AND TURNS TO AVOID AN OVERTAKING C340 WHO CAME WITHIN 200 FT OF HIS ACFT 22 MI E OF TPL, TX.

Narrative: ACFT #1 LEVEL CRUISE 4500 FT, 120 KTS, HDG 215 DEGS, RADAR ADVISORIES, FLT FOLLOWING WITH GRK APCH ASSIGNED DISCRETE SQUAWK. GRK ADVISED ACFT #1 OF ACFT #2 OVERTAKING AT 190 KTS FROM 5 O'CLOCK POS AT 4500 FT, NO RADIO CONTACT, SQUAWK 1200, AT 5 MI. ACFT #1 ACQUIRED VISUAL CONTACT AT ABOUT 2.5 MI, CONSTANT BEARING AND DECREASING RANGE. ADVISED GRK APCH OF VISUAL CONTACT. WHEN CLOSURE DECREASED TO BTWN 800-600 FT HORIZLY, ACFT #1 EXECUTED A DIVING R BANK EVASIVE MANEUVER. ACFT #1 ROLLED WINGS LEVEL, IDENTED ACFT #2 AS A 300 SERIES CESSNA TWIN PROP AND RPTED SAME TO GRK APCH. GRK APCH NOTED NO CHANGE IN ACFT #2'S SPD, ALT, OR HDG AT ANY TIME. GRK APCH RADAR 'TAGGED' ACFT #2 AND ALERTED AUS APCH OF INCOMING ACFT #2 FOR IDENT AND FURTHER INVESTIGATION. PIC OF ACFT #1 CALLED AUS APCH ON TELEPHONE AND INFORMED THAT C340 PIC NEVER SAW ACFT #1, DID NOT TALK OR SQUAWK WITH GRK APCH. NO EXPLANATION OFFERED FOR LACK OF DUE DILIGENCE.

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.