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To provide advisories, TCAS identifies a three dimensional airspace around the airplane where a high likelihood of traffic conflict exists. The dimensions of this airspace are based upon the closure rate with conflicting traffic.
TCAS equipment interrogates the transponders of other airplanes to determine their range, bearing, and altitude. A traffic advisory (TA) is generated when the other airplane is approximately 40 seconds from the point of closest approach. If the other airplane continues to close, a resolution advisory (RA) is generated when the other airplane is approximately 25 seconds from the point of closest approach. The RA provides aural warning and guidance as well as maneuver guidance to maintain or increase separation from the traffic.
Non–transponder equipped airplanes are invisible to TCAS. RAs can be generated if the other airplane has a mode C transponder. Coordinated RAs require both airplanes to have TCAS.
Copyright . The Boeing Company. See title page for details.
15.20.18  June 1, 2005

Warning Systems -System Description 737 Flight Crew Operations Manual
Advisories and Displays
Annunciations associated with TCAS and the traffic displays are discussed further in Chapter 10.
TAs are indicated by the aural “TRAFFIC, TRAFFIC” which sounds once and is then reset until the next TA occurs. The TRAFFIC annunciation appears on the navigation display. The TA symbol appears at the proper range and relative bearing of the other airplane. Altitude and vertical motion are included with the symbol if the other airplane is using transponder mode S or C.
RAs are indicated by one or more aural listed in the RA aural table. The TRAFFIC annunciation and RA symbol which depicts the traffic’s relative bearing, range, altitude, and vertical motion are on the navigation display similar to the TA symbol.
Additional symbols are proximate traffic and other traffic. Proximate traffic is within six miles and 1200 feet vertically, but is not expected to cause a TA or RA alert. Other traffic is beyond the six mile and 1200 feet vertical criteria. Traffic symbols are revised as the TCAS system constantly reevaluates the motion of other airplanes.
If the range of the navigation display does not permit the display of a TA or RA an OFFSCALE annunciation appears on the navigation display.
TA or RA traffic detected by TCAS which do not provide a bearing generate a no–bearing text block beneath the TRAFFIC text on the navigation display. The text block contains distance, altitude, and vertical motion information.
Vertical motion information is indicated by an arrow depicting a climb or descent if a change of greater than 500 feet per minute is detected.
TCAS display automatically shows when:
.
the transponder mode selector is in TA ONLY or TA/RA, and

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a TCAS TA or RA occurs, and

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neither pilot has the TCAS (TFC) display selected, and

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in MAP, center MAP, VOR, or APP modes.

Inhibits YA721 - YA803
INCREASE DESCENT RAs are inhibited below approximately 1,500 feet radio altitude.
DESCEND RAs are inhibited below approximately 1,100 feet radio altitude.
All TCAS voice annunciations and all RAs are inhibited below approximately 1,000 feet radio altitude. Below 1,000 feet when the TA/RA mode is selected on the transponder panel, TA only mode is enabled automatically and the TCAS message TA ONLY displays on the ND.
Copyright . The Boeing Company. See title page for details.
Warning Systems -System Description 737 Flight Crew Operations Manual

All TCAS alerts are inhibited by GPWS and windshear warnings.
Inhibits YA613 - YA687, YA809 - YK104
INCREASE DESCENT RAs are inhibited below approximately 1,500 feet radio altitude.
DESCEND RAs are inhibited below approximately 1,100 feet radio altitude.
RAs are inhibited below approximately 1,000 feet radio altitude. Below 1,000 feet when the TA/RA mode is selected on the transponder panel, TA only mode is enabled automatically and the TCAS message TA ONLY displays on the ND.
All TCAS voice annunciations are inhibited below approximately 500 feet radio altitude.
All TCAS alerts are inhibited by GPWS and windshear warnings.
Mode Control
The TCAS operating mode is controlled from the TCAS/ATC transponder panel. TCAS is normally operated in the TA/RA mode. However, sometimes it is necessary to operate in the TA ONLY mode to prevent undesired RAs. For example, TA ONLY may be selected when intentionally operating near other airplanes such as might be found in VFR conditions at a busy airport, or on parallel approach.
ATC transponders on TCAS equipped airplanes communicate to provide appropriate coordinated avoidance maneuvers. When performance is limited, such as with an inoperative engine, select TA ONLY to prevent receiving RAs beyond the airplane’s capabilities, and to prevent communicating to other airplanes an ability to perform a RA maneuver.
　
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