Whether a Resolution Advisory is currently active. False (with every other field still populated) means no advisory is presently in effect.
The named RA type for a single-threat encounter, derived from corrective/downwardSense/increasedRate/senseReversal/altitudeCrossing. Undefined when active is false, or when the flag combination has no defined single-threat RA type (e.g. some multi-threat composites - see doNotPassBelow/doNotPassAbove/doNotTurnLeft/doNotTurnRight).
True when this RA requires own aircraft to cross through the threat's altitude.
True if own aircraft must change its current vertical speed to comply; false if the RA is preventive (own aircraft is already in conformance and must only avoid certain rates).
Resolution Advisory Complement: restricts own aircraft from climbing above its current altitude. Primarily meaningful in multi-threat encounters.
Resolution Advisory Complement: restricts own aircraft from descending below its current altitude. Primarily meaningful in multi-threat encounters.
Resolution Advisory Complement: reserved for a horizontal-maneuver capability TCAS II does not implement (TCAS II issues vertical RAs only) - expected to always be false in practice, decoded for completeness.
Resolution Advisory Complement: reserved for a horizontal-maneuver capability TCAS II does not implement (TCAS II issues vertical RAs only) - expected to always be false in practice, decoded for completeness.
True when the RA's sense is downward (descend-family); false when upward (climb-family).
True once own aircraft has been told to accelerate its climb/descent beyond the initial RA's target rate.
True when this report resolves more than one simultaneous threat.
True for a positive RA (a specific target climb/descend rate); false for a negative/Vertical-Speed-Limit RA (a rate to avoid).
True when this RA reverses the sense of a previously issued RA for the same encounter.
True for up to 18 seconds after an RA ends, indicating it is no longer displayed to the pilot.
The threat this report responds to - narrow on threat.threatType to access the identity fields for that kind.
A decoded ACAS/TCAS Resolution Advisory report - BDS 3,0 content, carried either in a DF16 long air-air surveillance reply's MV field, or in a DF17/18 type-code-28 subtype-2 ME field (the ADS-B RA broadcast, which carries the identical content so aircraft without interrogation capability can still see an active RA).