lmml 14/32
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B733 Fuel Consumption

Mon Aug 08, 2005 3:15 am

Recently we had this 75 minute flight with a payload of just 3000kg where we burned 3100Kgs of fuel. On the way back, same flying time, our payload was 14,000Kgs and the burnoff was just 250Kgs more than the other sector. Can anyone explain this please? How much fuel does a B733 burn in the climb?
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RE: B733 Fuel Consumption

Mon Aug 08, 2005 4:08 am

hi LMML,

Quoting LMML 14/32 (Thread starter):
How much fuel does a B733 burn in the climb?

I dont know the exact amount of the climb fuel, I am no dispatcher, I just fly the 737! And when we calculate fuel, we use 40 kgs/min (2400kgs/hour).

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RE: B733 Fuel Consumption

Mon Aug 08, 2005 5:13 am

The extra fuel burn is going to be related to the total weight of the aircraft, not just the difference in payload.

Also, on your return trip you were presumably carrying 3,100 Kg less fuel.
The glass isn't half empty, or half full, it's twice as big as it needs to be.
lmml 14/32
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Joined: Tue Jan 30, 2001 2:27 am

RE: B733 Fuel Consumption

Mon Aug 08, 2005 7:20 am

Actually on the return trip we were carrying just 300Kgs more than the outbound. I can understand that fuel burn is related to the total weight but the total weight is determined by the payload and on our return trip we were 11,000Kgs heavier.
barney captain
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RE: B733 Fuel Consumption

Tue Aug 09, 2005 1:16 am

Many other factors could have affected the burn. The two most likely are speed and altitude.
Southeast Of Disorder
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RE: B733 Fuel Consumption

Tue Aug 09, 2005 5:38 am

Here are a few other factors that can play a role:

1. Winds, east vs. west bound
2. Actual distance flown -- especially in Europe, with both standard and tactical restrictions, the distance can vary quite a bit directionally on a city pair
3. Speed flown (late outbound but OK return? Restricted by ATC in one direction?)
4. Altitude flown (either intentionally for speed purposes, or due to ATC restrictions or weather)
5. Maneuvering on approach (or even departure) -- for traffic or other issues, can make a big difference, also early descent/leveloff into some airports can be severe and others nonexistent, runways can make a difference (e.g. if both airports have 09 active, eastbound flight can be much shorter than westbound, depending on the arrivals/departures for the specific airports)

Also did you count the taxi burns as well? Were the taxi times similar?

Big thing is knowing the actual distance, speed, and altitude for each direction.
7 hours aint long-haul
lmml 14/32
Posts: 2358
Joined: Tue Jan 30, 2001 2:27 am

RE: B733 Fuel Consumption

Tue Aug 09, 2005 6:58 pm

I know that the taxi time were the same at both airports and that 200Kgs was allowed for that. The flight conditions were also the same. Altitude only differed by 1000ft. There were no significant winds, in fact the wind was x and light all the way in both directions and no weather avoidance was required. I will take other readings on different flights to check the variance and post here.
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Joined: Sat Oct 27, 2001 9:43 am

RE: B733 Fuel Consumption

Sun Aug 14, 2005 6:11 am

LMML 14/32 can you explain the flowing :

-Exact route.
-A/C registration in every sector.

I agree with 3201 specially 5th item .

Also don't forget the material oldness, may be one was older than the other .

Without mistakes we will never learn

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