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.TCAS interrogates operatingtransponders in other aircraft, tracks the other aircraft by analyzing thetransponder replies, and predicts the flight paths and positions.TCAS providesadvisory, flight path guidance, and traffic displays of the other aircraft to the flightcrew.Neither advisory, guidance, nor traffic display is provided for other aircraftthat do not have operating transponders.TCAS operation is independent ofground based air traffic control.To provide advisories, TCAS identifies a three dimensional airspace around theairplane where a high likelihood of traffic conflict exists.The dimensions of thisairspace are contingent upon the closure rate with conflicting traffic.TCAS provides advisories and traffic displays:" resolution advisory (RA) " proximate traffic displayand display" other traffic display" traffic advisory (TA) anddisplayTCAS messages and TCAS traffic symbols can be displayed on the ND in themap, map centered, VOR, and approach modes.TCAS messages and TCAStraffic symbols cannot be displayed on the ND in the VOR centered,approach centered, or plan modes.Resolution Advisories (RA) and DisplayA RA is a prediction another aircraft will enter TCAS conflict airspace withinapproximately 20 to 30 seconds.If altitude data from the other aircraft is notavailable, no RA can be provided.When TCAS predicts an RA:" a TCAS voice annunciation sounds" TCAS PFD vertical guidance is displayed" the TCAS red message TRAFFIC is displayed on the ND.When the TCAS cyan message TFC is displayed on the ND, and the RA is withinthe display range of the ND, the TCAS RA traffic symbol and its accompanyingdata tag are displayed on the ND.The TCASRAtraffic symbol is a filledredsquare.The RAdata tagcontains thealtitude and the vertical motion arrow.Copyright © The Boeing Company.See title page for details.15.20.8 D6-30151-425 April 01, 2001 Warning Systems -System Description747 Operations ManualFor no bearing RAs, the red RA label is displayed below the red message,TRAFFIC, and the RA data tag information is displayed to the right of the label.The RA data tag contains the distance, altitude, and the vertical motion arrow.When the RA is further from the airplane than the ND range currently displayed,the TCAS red message OFFSCALE is displayed on the ND.Traffic Advisories (TA) and DisplayA TA is a prediction another aircraft will enter the conflict airspace in 25 to 45seconds.TAs assist the flight crew in establishing visual contact with the otheraircraft.When TCAS predicts a TA:" the TCAS voice annunciation TRAFFIC, TRAFFIC sounds once" the TCAS amber message TRAFFIC is displayed on the ND.When the TCAS cyan message TFC is displayed on the ND and the TA is withinthe display range of the ND, the TCAS TA traffic symbol and its accompanyingdata tag are displayed on the ND.The TA traffic symbol is a filled amber circle.The TA data tag contains thealtitude and vertical motion arrow.For no bearing TAs, the amber TA label is displayed below the TRAFFICmessage, and the TA data tag information is displayed to the right of the label.TheTA labels are displayed below the RA labels.The TA data tag contains thedistance, altitude, and vertical motion arrow.When the TA is further from the airplane than the ND range currently displayed,the TCAS amber message OFFSCALE is displayed on the ND.Proximate Traffic DisplayProximate traffic is another aircraft that is neither an RA or a TA but is within:" six miles" 1,200 feet verticallyWhen the TCAS cyan message TFC is displayed on the ND, and the proximatetraffic is within the ND display range, the TCAS proximate traffic symbol isdisplayed on the ND.The TCAS proximate traffic symbol is a filled white diamond.If the other aircraftis providing altitude data, the proximate traffic data tag is displayed on the ND.The proximate traffic data tag contains the altitude and vertical motion arrow.Copyright © The Boeing Company.See title page for details.April 01, 2001 D6-30151-425 15.20.9 Warning Systems -System Description747 Operations ManualOther Traffic DisplayOther traffic is another aircraft that is within the ND display limits but is neitheran RA, a TA, or proximate traffic.If the other aircraft is not providing altitudeinformation, other traffic becomes proximate traffic automatically when withinsix miles.When the TCAS cyan message TFC is displayed on the ND and the other trafficis within the ND display range, then the TCAS other traffic symbol is displayedon the ND.The TCAS other traffic symbol is a hollow white diamond.If the other aircraft isproviding altitude data, a data tag like that described in the proximate trafficdisplay is displayed.TCAS PFD Vertical GuidanceWhen TCAS predicts an RA, TCAS PFD vertical guidance is displayed for atraffic avoidance maneuver to ensure vertical separation.Traffic avoidance isensured by adjusting or maintaining a pitch attitude outside the red outlined RApitch region.If the traffic aircraft also has TCAS and a mode S transponder, TCAS verticalguidance is coordinated with the traffic aircraft TCAS.TCAS ND MessagesND Message Color DescriptionTFC Cyan TCAS traffic display enabled
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