Narrative:

Our facility is a non radar approach control with approach control located in the tower cabin attendant. I was working local control with approach control seated next to me. I cleared the MTR for takeoff on runway 18 with a left turn direct the VORTAC (located 2 mi northeast of the airport) climbing to 4000 ft MSL. He was performing a practice approach so I switched him to approach control. At the same time, I was working in 3 VFR single-engine small aircraft's from the northeast. At the time the MTR began takeoff roll, I had 2 small aircraft's in sight and was attempting to locate small aircraft Y with position reports (since we had no radar). However, all 3 pilots belonged to a flight school located at another airport that taught non english speaking foreigners and was notorious for sending them out with limited navigation skills and even more limited english. Therefore, their position reports were neither making sense nor corresponding to the observed position of the 2 in- sight aircraft. Also, they were not following instructions, I was having problems sequencing them and I felt issuing traffic would be useless and create more confusion. Approach control issued traffic to the MTR then observed small aircraft Y north of the VORTAC at 3500 ft MSL, a few hundred yds from the MTR head-on. Approach issued an immediate right turn to the MTR thus avoiding a possible collision. I believe the cause of the incident was a combination of the lack of communications between the 3 small aircraft pilots and myself and the absence of radar. Either one alone would not have been so dangerous.

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Original NASA ASRS Text

Title: SMA Y NON ADHERENCE TO ATC INSTRUCTIONS HAD NMAC WITH MTR. NMAC. SEE AND AVOID CONCEPT.

Narrative: OUR FACILITY IS A NON RADAR APCH CTL WITH APCH CTL LOCATED IN THE TWR CAB. I WAS WORKING LCL CTL WITH APCH CTL SEATED NEXT TO ME. I CLRED THE MTR FOR TKOF ON RWY 18 WITH A L TURN DIRECT THE VORTAC (LOCATED 2 MI NE OF THE ARPT) CLBING TO 4000 FT MSL. HE WAS PERFORMING A PRACTICE APCH SO I SWITCHED HIM TO APCH CTL. AT THE SAME TIME, I WAS WORKING IN 3 VFR SINGLE-ENG SMA'S FROM THE NE. AT THE TIME THE MTR BEGAN TKOF ROLL, I HAD 2 SMA'S IN SIGHT AND WAS ATTEMPTING TO LOCATE SMA Y WITH POS RPTS (SINCE WE HAD NO RADAR). HOWEVER, ALL 3 PLTS BELONGED TO A FLT SCHOOL LOCATED AT ANOTHER ARPT THAT TAUGHT NON ENGLISH SPEAKING FOREIGNERS AND WAS NOTORIOUS FOR SENDING THEM OUT WITH LIMITED NAVIGATION SKILLS AND EVEN MORE LIMITED ENGLISH. THEREFORE, THEIR POS RPTS WERE NEITHER MAKING SENSE NOR CORRESPONDING TO THE OBSERVED POS OF THE 2 IN- SIGHT ACFT. ALSO, THEY WERE NOT FOLLOWING INSTRUCTIONS, I WAS HAVING PROBLEMS SEQUENCING THEM AND I FELT ISSUING TFC WOULD BE USELESS AND CREATE MORE CONFUSION. APCH CTL ISSUED TFC TO THE MTR THEN OBSERVED SMA Y N OF THE VORTAC AT 3500 FT MSL, A FEW HUNDRED YDS FROM THE MTR HEAD-ON. APCH ISSUED AN IMMEDIATE R TURN TO THE MTR THUS AVOIDING A POSSIBLE COLLISION. I BELIEVE THE CAUSE OF THE INCIDENT WAS A COMBINATION OF THE LACK OF COMS BTWN THE 3 SMA PLTS AND MYSELF AND THE ABSENCE OF RADAR. EITHER ONE ALONE WOULD NOT HAVE BEEN SO DANGEROUS.

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.