Fuel Consumption 767-300ER

[triple7x]

Hi @ all

I need accurate and current information, what the average fuel consumption is for a long haul flight. Also if possible approximate flight time & TAS/GS. I can't find the information at Boeing website.

Facts:
- 767-300ER, MOTM 187t
- Distance 4500NM (west- or eastbound)
- FL350
- 85% Pax & Cargo

Thanks for your help!

[WX-T]

B767- 300 GE (CF6-80C2B6)

Mach 0.792 (cost index 40), TAS 470kt at 5000kg/hr avg
Inital FL330 at 185 ton, FL350 at 157 ton, FL 370 at 142 ton.

Climb 20 min, 120nm and 4000 kg
Descent 25 min, 120nm and 500kg
Cruise 9hr 5 min, 4260nm and 45,500kg
Total 9 hr 50 min, 4500nm and 50,000kg (Flight Fuel)

ZFW 130t max
FF 50t
Res 5t
TOW 185t max

Hope this helps.

[mathy]

230 pax at 98kg each including bags i.e. 77kg+21kg; add 900kg of other cargo. Available Flight Levels are 310, 350,390. Assume 4500nm still air ISA at M0.80; 200nm div, 30min hold, 5% contingency plus one missed approach. Guess OWE is Boeing’s catalogue figure plus 1.5 tonnes i.e. 91.6 tonnes. Trip burn ~ 47 tonnes, 8.3 tonnes total reserve. When AUW = 145.8 tonnes then half of cruise fuel is expended. This is at about 1790nm. Laptop figures are 4700kg/hr at that point. Trip time 9hrs 52min. Awfully rushed though and I may have made a mistake. Cross check with other replies.

[triple7x]

thank you for your reply!

I receive the information of an average fuel consumption of 5031kg for a long haul flight, but I don't know which type of engine.

WX-T write: 4700kg per hour based on GE engine.
Mathy: on which assumptions result your figures?

Exist a great difference between GE and PW engines?
Is the fuel consumption higher/less/equal with PW engines?

And one further question: Whats the correct formula to translate the fuel flow from kg into USG.
Based on my information above: 5031kg = 1680USG per hour.

[mathy]

Direct from Boeing with one proviso. I did not enter or use a bias value as that would be improper release of privileged data . so its a pretty bland generic B767 with its identity smudged out.

On the subject of engines there is a spread of a few percent between rival makes but these are subject to continuous improvement and different construction types age differently.

I can thoroughly recommend "Gas Turbine Performance" by Walsh and Fletcher. If you apply yourself to this book you will get to grips with how engines turn and burn. But never to the degree of a third decimal place in sfc for example.

Unless there is some really frustrating bit I have missed out, which I'll be glad to correct [disclosure rules permitting] I don't think I've much more to add.

Nice question though and it is a nice aircraft too.

Good Luck with whatever it is you are doing. Drop me a line if you are bemused.

Mathy

[triple7x]

Dear Mathy,
thank you for your further information. Your answer was very useful and also very detailed..!
At the time I work on a new project. I can't tell you more at this time, but I would as soon as I can... sorry!

The only missing information I need:
how much are 4700kg or 5000kg kerosene/jet fuel in US gallons?
And what's the right formula to translate kg into USg?

Is anyone here who could help me with that question?
Thank you for your efforts!

[Pugilistic Animus]

(4700kg * 2.2 lbs/kg) / 6.5 lbs/gal

if you are really fussy then use the specific gravity of the fuel and multiply that with the density of water [in lbs since use want that] at the required temperature/ or find a fuel density chart and use that value:)

[triple7x]

:ok: thank you folks!

[Cristiano.Flyhigh]

Dear Sirs:

And what about the consumption of the 767-200ER (2 men crew) and 767-400ER? Is there much difference down and up?

Thank you :ok:

[stilton]

762 10,000 pounds per hour


764 12,000 pounds per hour.

[Cristiano.Flyhigh]

Oh, friend. Thank you a lot! I am doing a project and needed that information a lot. :D