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:O

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.

:uhoh: