AC 120-55C Air Carrier TCAS - Code7700

AC 120-55C 2/23/11Appendix 6(a) Other Traffic. Other traffic, for example traffic within the selected display rangethat is not proximate traffic, or causing a TA or RA to be issued.(b) Proximate Traffic. Proximate traffic, for example, traffic that is within 6 NMand ±1200 feet.(c) Non-Altitude Reporting. Non-altitude reporting traffic.(d) TAs and RAs. No bearing TAs and RAs.(e) Off-Scale TAs and RAs. Change the selected range for off-scale TAs and RAs toensure that all available information on the intruder is displayed.(f) TAs. Select the minimum available display range which allows the display ofTAs to provide the maximum display resolution.(g) RAs (Traffic Display). The minimum available display range of the trafficdisplay which allows the traffic to be displayed should be selected to provide the maximumdisplay resolution.(h) RAs (RA Display). Pilots should demonstrate knowledge of the meaning of thered and green areas displayed on the RA display and when the green areas will and will not bedisplayed. Pilots should also demonstrate an understanding of the RA display limitations(for example, if a VS tape is used and the range of the tape is less than 2,500 fpm, an Increaserate RA cannot be properly displayed).(i) Pilot Adjustments. If appropriate, awareness that navigation displays oriented ontrack-up may require a pilot to make a mental adjustment for drift angle when assessing thebearing of proximate traffic.NOTE: The wide variety of display implementations will require thetailoring of some criteria. When the training program is developed, thesecriteria should be expanded to cover details for an operator’s specific displayimplementation.g. Use of the TA-Only Mode.(1) Objective. To verify that a pilot understands the appropriate times to select theTA-only mode of operation and the limitations associated with using this mode.(2) Criteria. The pilot must demonstrate the following:(a) Knowledge of the operator’s guidance for the use of TA-only.(b) If TA-only is not selected when an airport is conducting simultaneous operationsfrom parallel runways separated by less than 1,200 feet, and to some intersecting runways, RAscan be expected.Page 6