A simple but efficient way to reduce fuel consumption is to fly shorter. Like in any mode of transportation, using a shortcut reduces the energy consumed and the time to go from point A to point B. In the sky, flights usually follow a predefined path, which is called a flight plan. It is a list of points that define the trajectory of the plane. Contrary to cars on roads, aircraft can deviate from this planned route. Pilots can ask for direct routes, and therefore improve their fuel efficiency.
What you'll learn:
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A direct is a shortcut between two waypoints of the flight plan. For example, on the image below, the standard routing would be to follow the flight plan’s different waypoints, but a direct can be flown from waypoint RAVIA to waypoint TAHAR. By taking this direct route, the aircraft saves time and fuel.
A shortcut can be asked by a pilot but needs to be approved by ATC controllers. That is why a direct is usually only possible in a single airspace, where ATC controllers have full visibility and control.
Direct fuel savings can vary from around 80 kg (176 lbs) per direct on a single-aisle, and up to 120 kg (265 lbs) per direct on a widebody. For one single-aisle aircraft, it can represent an overall benefit of 120 000 kg of fuel (264 555 lbs), which equals to around 380 000 kg of C02 (837 757 lbs) or 80 000 $ in a single year, provided that on each flight a direct is taken.
Therefore, there is a huge potential if directs are widely used and flown in the airline.
Using directs to improve fuel efficiency seems simple, but in practice, directs are not used as much as they could be. You are undoubtedly aware of the possibility of asking for a direct.
Learning from the history
Knowledge of where directs can be performed is key. All the historical flights that you and your fellow pilots have already flown can be used to build up a database of possible directs. This database offers a reliable source of where and when directs can be requested, as we can know which direct is likely to be granted and how often it is flown. It makes it possible for a pilot who has never flown on a particular leg to know where and when he/she can ask ATC for a direct, and the chance of really flying it.
Preparing the flight
While preparing the flight, the possible direct routes on your next flight can be provided. You can prepare your flight knowing the probability of getting those directs.
Getting the right information at the right time
Getting the information of possible directs on the next flight is one thing, but you have a heavy workload, and sometimes the info given during the briefing is put aside while an urgent situation arises. Another way of improving your usage of directs is to be alerted at the right time, meaning when you need to decide to ask the direct to the ATC.
Historical data enables building a database of possible directs along with the probability of getting the direct. But the computation of actual savings of a direct in-flight should take into account actual conditions such as weather conditions (temperature and wind), grossweight, and actual speed of the aircraft.
To make this possible, we recommend using a tool like SkyBreathe OnBoard Direct Assistant that provides real-time support for fuel-saving during the flight in a seamless, natural, and simple way. The app pushes relevant and timely notifications to pilots about direct opportunities, and actual potential savings associated.
Pilots can then engage with ATC controllers to ask for a direct route, knowing the time and fuel gain of the operation.
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Recap: Directs explained in 2 minutes