Sq ( AFCS ) providing Air Traffic Control services for the Ubon tower, terminal radar approach area and enroute services for Bangkok Center . 1982 Comm, Sq . also maintained the AB Telcom and VOR / TACAN ( VORTAC channel 51 ) equipment.
22.
A separate elevator next to the turntable transports the balls to the ball return system, which has a near-vertical ramp that the balls roll down to gain enough momentum to roll through either an above-lane or submerged trough back up the alley, entering the ball return rack next to the approach area where players can grab them.
