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Richard McDonald Woods

Re-dispatch usage

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Hi long-haulers!

 

I have been using re-dispatch on most of my B777 long hauls since PFPX release.

 

What has been your experience of how fuel remaining figures have been lower than before using re-dispatch?

 

Regards, Richard

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Never done it before, but I'd think you would always have lower fuel numbers with re-dispatch. When you think about it, the point is to have the dispatch to a point midway through your flight, and as you get near that point, you get a new dispatch to your actual destination. And that happens because on a longer flight, you'd have to carry more fuel by regulation. On an international flight, according to the FARs, you need trip fuel, fuel to the most distant alternate, 10% trip time, and 30 minutes of fuel at holding speed 1500 feet above the ground. So on a 14-hour flight, 10% trip time would be 84 minutes of fuel, whereas if you broke it down in half, a 7-hour segment would have a 10% trip time of just 42 minutes. So in theory, you'd be able to carry less fuel on a flight that gets re-dispatched than on a flight that doesn't. Therefore, in theory, you should always have lower fuel numbers with re-dispatch than without, otherwise there wouldn't be any point in doing it.

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Never done it before, but I'd think you would always have lower fuel numbers with re-dispatch. When you think about it, the point is to have the dispatch to a point midway through your flight, and as you get near that point, you get a new dispatch to your actual destination. And that happens because on a longer flight, you'd have to carry more fuel by regulation. On an international flight, according to the FARs, you need trip fuel, fuel to the most distant alternate, 10% trip time, and 30 minutes of fuel at holding speed 1500 feet above the ground. So on a 14-hour flight, 10% trip time would be 84 minutes of fuel, whereas if you broke it down in half, a 7-hour segment would have a 10% trip time of just 42 minutes. So in theory, you'd be able to carry less fuel on a flight that gets re-dispatched than on a flight that doesn't. Therefore, in theory, you should always have lower fuel numbers with re-dispatch than without, otherwise there wouldn't be any point in doing it.

 

Quite alot of airlines (mainly usa and canada) use "reclear" as its properly called (i think) its a great way of saving money, but from my experience, explaining it to the operating crew is the hardest part

 

we trialed it at my old long haul airline and it worked well but it never really got implemented.

 

At my current airline we have problems explaining to our 23 year old f/os and 27 year old captains what an en route alternate is, not to mention getting them to depart on an hour flight without crew food,  let alone the harrowing idea of giving them not one flightplan, but  3 flightplans and having to explain to them where the reclear point it, and what they are supposed to do when they are 100nm miles away from it !!!!

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