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=== TCAS II ===
[[File:TCAS RA.png|thumb|An example of a resolution advisory (RA), where the pilot is requested to climb at 1,750 feet per minute to avoid nearby traffic (shown in red)]]
TCAS II is the first system that was introduced in 1989 and is the current generation of instrument warning TCAS, used in the majority of [[commercial aviation]] aircraft (see table below). A US Airways 737 was the first aircraft certified with the AlliedBendix (now Honeywell) TCAS II system. It offers all the benefits of TCAS I, but will also offer the pilot direct, vocalized instructions to avoid danger, known as a "Resolution Advisory" (RA). The suggestive action may be "corrective", suggesting the pilot change vertical speed by announcing, ''"Descend, descend"'', ''"Climb, climb"'' or ''"Level off, level off"'' (meaning reduce vertical speed). By contrast a "preventive" RA may be issued which simply warns the pilots not to deviate from their present vertical speed, announcing, ''"Monitor vertical speed"'' or ''"Maintain vertical speed, Maintain"''. TCAS II systems coordinate their resolution advisories before issuing commands to the pilots, so that if one aircraft is instructed to descend, the other will typically be told to climb – maximising the separation between the two aircraft.<ref name="TCAS71" />
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