fuel planning 747/340

[Mikey21]

Just wondering what rule rule of thumbs do you use for fuel planning on the heavy.
I realise that it depends on many parameters, but I am just looking for a approximate number.
is it in the 3 tons/h par engine? just guessing,

anyone knows ? what about the 340,

how much fuel would you carry on a 15h flight?

thanks for your info.

I am also trying to answer that question:
if 1.8 Epr produce 60 000 lbs of thrust, would 1.8 epr produce the same thrust, let's say after 5 years of engine usuage??

[WaldoPepper]

Mikey21,

Generally for the 340-300 I use 7T/hr for the trip fuel. Then after adding on all the other bits:
Taxi
Contingency
Mandatory
Alternate
Reserve

...Which will vary, you come up with a figure about 12T more than the trip fuel.

So on a 12hr flight (London), expect something like 96T total fuel.

The 340-600 uses a bit more, something like 9T/hr. SO the 15hr flight to New York will have approx 147T total.

This weather being good, if alternates are needed then depending where they are it will bump the fuel up a bit higher.

I don't know about the 747 at all, maybe someone else can answer that one.

[Mikey21]

Thanks Waldo,
found this interresting.
I recall from another post that the fuel trip for the 47 might be around 12t/h

not to sure how accurate that is, I realise the Bus is more economical, but seems a little high , perhap's will get more input?

thanks again.
cheers good day.

[banana head]

12T p/h is a pretty good guesstimate for the 744

[Jn14:6]

12T/hr average is a bit over the top. TOC burn = 12T/hr, decreasing to around 8T/hr approaching landing weights, so an average of just over 10T/hr would be about ball-park.

[AAIGUY]

B747 Classic is 12T. High and light I have seen it dip to just under 9 T after 8-9hrs. I use 12 as a rule of thumb for my planning.

[FO Cokebottle]

Try a block of 10T/hr so as you can make a quick decision, after glancing at the Fuel Totalizer on the FE's panel, on where to divert then call for the burn rate at the 3 eng crz (long range) FL from the performance tables which should be the your company's AOM which is available in the aircraft library

Note: the burn with 4 at optimum crz FL is pretty much the same as the burn with 3 at 3 eng alt capability - lower crz level = higher burn, higher EPR = higher burn.

Some may have forgotten what CRM in a 3 man aeroplane is really like..............hhmmmmmm heaven

Or it may be the case that most have raced up the career ladder (C152 instr to Hvy Jet) so fast they skipped performance and experience.