Estimated Time of Arrival
|Term||Estimated Time of Arrival|
Flight Management System (FMS)
Target Time of Arrival (TTA)
Required Time of Arrival (RTA)
1. (SESAR) the time computed by the FMS for the flight arriving at a point related to the destination airport
2. (ICAO) For IFR flights, the time at which it is estimated that the aircraft will arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the aerodrome, the time at which the aircraft will arrive over the aerodrome.
For VFR flights, the time at which it is estimated that the aircraft will arrive over the aerodrome.
1. Episode 3, D2.2-049 - Detailed Operational Description - Glossary of Terms and Definitions (Lexicon), Version : 2.00
2.ICAO, Official definition, ICAO doc. 8400, Procedures for Air Navigation Services — ICAO Abbreviations and Codes (2004)
When an aircraft is flying to a TTA, the FMS will still provide an estimated ETA. When an aircraft is flying to a CTA, the ETA will be replaced by the RTA.
When negotiating a CTA with the ground, the FMS provides the bounds for a feasible RTA, expressed as ETA(max)/ETA(min). (source: Episode 3)
Lexicon Release 2015.2