Constraints (generally in order of priority, h= hard, s=soft)
weather changes h congested airspace changes h special use airspace changes h ATC constraint changes (general) h ground congestion changes at destination (like a closed runway) h wind changes or errors h alternate airport status change h crew duty/rest cycles h airplane model performance errors h or s turbulence h or s connecting pax (no FIM’s (flight interruption manifests) s on-time performance s fuel efficiency s fuel prices (will consider in choice of new alternate) s station personnel schedules s FBO agreements s maintenance resources s
note: Tried to get her to prioritize between on-time performance and fuel efficiency, but she wouldn’t. I think those issues related to deviations are outside her areas of concern. Dispatch doesn’t really think about replanning or deviations for fuel optimization once aircraft is airborne. Saving fuel in the course of a single flight is considered within the “noise.” Never told to watch their fuel burn.
Answers to individual questions did not vary that much from “planning” questions. Main differences are use of real data vs modeled data for aircraft performance, fuel remaining, weights, etc., and much more decision making by pilots versus dispatchers. Dispatchers still major source of information (relay traffic, weather advisories to flight crew) and computations (they “run the numbers”). This is a function of on-board equipment. Don’t think of replanning at all in terms of increasing fuel efficiency once aircraft is airborne.
Information (sources):
Main difference from planning is that real airplane data is substituted for model data where possible, and other real time data, instead of predictions (e.g., weather, congestion) are used.
Stakeholders:
Same as for planning
Flight planning/replanning in a freeflight environment
It is anticipated that aircraft will be given more freedom to plan their optimal flight paths in the future freeflight environment (remind interviewee of freeflight definition). If you were able to perform flight planning without ATC-imposed airway, altitude or speed restrictions, describe how you think flight planning and replanning would be different than in today’s environment.
How do you envision flight planning goals, constraints, information, and activities changing in a freeflight environment? (step through original description and ask how it would change)?
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