The Safety and Regulatory Compliance Department attended the monthly STL ATC/airport user meeting on Tuesday April 1Oth". There was an issue brought up to all the airlines that we see as a possible safety issue. When parallel approaches are in use and you are turning on to the final approach course, a "tight" tolerance is highly recommended. Understanding that most S.O.P.'s give a one‑half dot tolerance, one-half dot at 16 miles is approximately 1200 feet. That distance is at the edge of ATC's transgression zone. An entry into the transgression zone would require ATC to request the aircraft break off the approach. ATC does admit that on occasion they will give a late turn on for whatever reason. If you encounter this, it is very important to work your way back to the localizer ASAP.

 If you have any question about this issue or if you have an issue to discuss with ATC, please give me a call. 314-895-8700 x2095

Matt Conrad
Mgr. Flt. Ops Safety