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-   -   B787 Minimum fuel in tanks... (https://www.pprune.org/tech-log/595600-b787-minimum-fuel-tanks.html)

Nuggs 6th Jun 2017 21:54

B787 Minimum fuel in tanks...
 
Can anybody give me the B787-8 and -9 Boeing minimum fuel in tanks and the B777-200LR and B777-300ER minimum fuel in tanks as well...thanks folks

Tu.114 6th Jun 2017 22:12

Minimum fuel... as in minimum block, unusable ullage, or what?

flyhardmo 6th Jun 2017 22:52

Minimum fuel is just before the engines flame out

misd-agin 7th Jun 2017 00:26

When the lights come on. Seriously.

Nuggs 7th Jun 2017 00:50


Originally Posted by Tu.114 (Post 9794899)
Minimum fuel... as in minimum block, unusable ullage, or what?

Minimum block fuel...is what I'm looking for

felixthecat 7th Jun 2017 06:18

Minimum block depends on the sector and on the countries rules you are following. Your question makes no sense.

wiggy 7th Jun 2017 06:30

Likewise..I am not really understanding the question........

For our 777-200s and 300s there's no minimum fuel level listed in the limitations section of the FCOM, the only vaguely relevant comment in another manual is that minimum fuel in tanks for a sector is flight plan fuel.

FullWings 7th Jun 2017 08:06


Can anybody give me the B787-8 and -9 Boeing minimum fuel in tanks and the B777-200LR and B777-300ER minimum fuel in tanks as well...thanks folks
What you need to get the job done?

eckhard 7th Jun 2017 09:46

Nuggs,
Perhaps you are looking for the minimum fuel in tanks after landing, below which one would have to declare an emergency? (In other words, 30 minutes' fuel at 1500ft, clean config, at the planned weight after diversion.)

For the 787-8 about 2000 kgs.
For the 787-9 about 2300 kgs.

CallmeJB 7th Jun 2017 10:20

Some operations assign an FCOM Limitation minimum fuel for takeoff in the B744 as 30,000kgs. This is to avoid FUEL PUMP PRESS messages due to unporting of fuel pumps during acceleration.

The 777 and 787 have no such limitations, that I'm aware of.

Nuggs 7th Jun 2017 12:35


Originally Posted by wiggy (Post 9795113)
Likewise..I am not really understanding the question........

For our 777-200s and 300s there's no minimum fuel level listed in the limitations section of the FCOM, the only vaguely relevant comment in another manual is that minimum fuel in tanks for a sector is flight plan fuel.

I'm sorry I should have been more clear....it would be the minimum fuel in tanks that on landing would not havee the min fuel lights coming on or having to do a flaps 20 landing in case of a go around...

Nuggs 7th Jun 2017 12:38


Originally Posted by wiggy (Post 9795113)
Likewise..I am not really understanding the question........

For our 777-200s and 300s there's no minimum fuel level listed in the limitations section of the FCOM, the only vaguely relevant comment in another manual is that minimum fuel in tanks for a sector is flight plan fuel.

I thought at one time I had read that the minimum fuel in tanks had to be 4800 kgs but I can't find it written anywhere for all 777 models

Nuggs 7th Jun 2017 13:12


Originally Posted by Tu.114 (Post 9794899)
Minimum fuel... as in minimum block, unusable ullage, or what?

Minimum block fuel...is what I'm looking for ....anything lower would cause the low fuel lights to come on and a possible flameout in the event of a go around ...

Fatguyinalittlecoat 7th Jun 2017 14:58

I think he's looking for the minimum operational Fuel load, similar to the 744 (QF anyway) which can't take-off with less than 30,000kg of fuel on board. Does the 787 have any such limitation?

misd-agin 7th Jun 2017 15:25

Minimum 'block' fuel? The minimum fuel required for takeoff?

Your question about the minimum fuel doesn't make sense. If the low fuel lights come on you don't necessarily flame out in the event of a g/a. You have x amount of fuel(time) left. If you exceed x time you'll flame out. If you land inside of x minutes you won't flame out.

And fuel burn varies greatly between fully configured, partially configured, or clean. The time spent in any of the configurations changes the amount of time to flameout.

wiggy 7th Jun 2017 15:45


it would be the minimum fuel in tanks that on landing would not havee the min fuel lights coming on or having to do a flaps 20 landing in case of a go around.
Fuel lights?? :bored:

Anyhow my current FCOM for the 777 says you will get the "Fuel Qty Low" EICAS message if the quantity of fuel in either left or right main tank is "low", theres no numeric amount specified....If memory and old course notes serve me correctly the trigger is less than approximately 2000 kg of fuel in either left or right tank..

Since the 747 has been mentioned when I first operated the classic 747 the company decreed min fuel load was 40 tonnes ( i.e. tank to engine feed, 10 tonnes per main tank) because of supposed worries about fuel pumps unporting etc....over the years it became apparent that wasn't a problem and on both the 747 and then the 744 we carried flight plan fuel'ish for departure, which made for fun on 30 minute or less "shuttle" sectors.

Cough 7th Jun 2017 16:02

787 Fuel Qty Low EICAS I understand to appear at 1700kg or below for either tank.


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