Narrative:

An MTR was descending through 7000 MSL when ZFW issued a traffic call of 12 O'clock 5 mi mode C indicates 5500. The MTR crew advised the center controller that the traffic was not in sight. The traffic was sighted 15 degree to the left of the MTR nose, level, headed directly at the MTR. An immediate 4-G right turn was initiated by the MTR using 60-70 degrees of bank. The twin small transport initiated a shallow right turn of approximately 10 degree angle of bank as the aircraft passed each other level with 150' of separation. Distance at initial sighting was less than 2000' horizontal distance. The twin was partially hidden by the MTR's canopy and windscreen supports. In this case a timely traffic call by an alert controller averted disaster. Both aircraft were legal in all respects, the twin was flying at a VFR hemispherical altitude but was not in communication with center. The fact that he was in the mode C required zone of the dfw TCA and was squawking helped greatly. Unfortunately the airspace south of NAS dallas is congested due to the presence of an extremely tall antenna farm and the TCA floor of 3000 to 4000'. Near midairs are common during VFR WX while flying the hi TACAN approach to runway 35. A contributing factor is the MTR's tactical paint scheme and a lack of strobe lights or landing lights which can be illuminated in the clean confign - all of which made even the large MTR difficult to see!

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Original NASA ASRS Text

Title: CLOSE PROX MTR ON HI TACAN APCH AND GA SMT TRANSITING THE AREA AT VFR ALT.

Narrative: AN MTR WAS DESCENDING THROUGH 7000 MSL WHEN ZFW ISSUED A TFC CALL OF 12 O'CLOCK 5 MI MODE C INDICATES 5500. THE MTR CREW ADVISED THE CENTER CTLR THAT THE TFC WAS NOT IN SIGHT. THE TFC WAS SIGHTED 15 DEG TO THE LEFT OF THE MTR NOSE, LEVEL, HEADED DIRECTLY AT THE MTR. AN IMMEDIATE 4-G RIGHT TURN WAS INITIATED BY THE MTR USING 60-70 DEGS OF BANK. THE TWIN SMT INITIATED A SHALLOW RIGHT TURN OF APPROX 10 DEG ANGLE OF BANK AS THE ACFT PASSED EACH OTHER LEVEL WITH 150' OF SEPARATION. DISTANCE AT INITIAL SIGHTING WAS LESS THAN 2000' HORIZONTAL DISTANCE. THE TWIN WAS PARTIALLY HIDDEN BY THE MTR'S CANOPY AND WINDSCREEN SUPPORTS. IN THIS CASE A TIMELY TFC CALL BY AN ALERT CTLR AVERTED DISASTER. BOTH ACFT WERE LEGAL IN ALL RESPECTS, THE TWIN WAS FLYING AT A VFR HEMISPHERICAL ALT BUT WAS NOT IN COM WITH CENTER. THE FACT THAT HE WAS IN THE MODE C REQUIRED ZONE OF THE DFW TCA AND WAS SQUAWKING HELPED GREATLY. UNFORTUNATELY THE AIRSPACE S OF NAS DALLAS IS CONGESTED DUE TO THE PRESENCE OF AN EXTREMELY TALL ANTENNA FARM AND THE TCA FLOOR OF 3000 TO 4000'. NEAR MIDAIRS ARE COMMON DURING VFR WX WHILE FLYING THE HI TACAN APCH TO RWY 35. A CONTRIBUTING FACTOR IS THE MTR'S TACTICAL PAINT SCHEME AND A LACK OF STROBE LIGHTS OR LNDG LIGHTS WHICH CAN BE ILLUMINATED IN THE CLEAN CONFIGN - ALL OF WHICH MADE EVEN THE LARGE MTR DIFFICULT TO SEE!

Data retrieved from NASA's ASRS site as of August 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.