Impacts of ATC Related Maneuvers on Meeting a Required Time of Arrival
February 2007
Paul Ostwald, The MITRE Corporation
ABSTRACT
The Next Generation Air Transportation
System (NGATS) as defined by the Joint Planning
and Development Office includes Trajectory-Based
Operations (TBO) as part of its concept of
operation. TBO are envisioned to form the basis for
both more strategic planning in the NGATS and for
more tactical operations including separation
management. The cornerstone of this concept is the
establishment of a four-dimensional trajectory. The
concept also calls for the use of a Controlled Time
of Arrival (CTA) to help manage the use of a
specific system resource.
A Flight Management System (FMS) onboard
the aircraft has capabilities that may prove useful
when operating under TBO. Such capabilities
include Required Time of Arrival (RTA)—the
capability to "self-deliver" to a specified waypoint
at a specified time. The RTA capability may be
employed to implement a CTA. This paper presents
an investigation into the FMS capabilities to meet
an RTA and looks at the impact of using a lateral
offset maneuver to address a tactical situation has
on a flight’s ability to meet an RTA. Several PCbased
models of a Smiths Aerospace FMS/Boeing
737 aircraft were used during this investigation.
This study focused on an RTA at a waypoint during
the cruise phase of a flight.

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