A319 Fuel
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Join Date: Jul 2007
Location: Pangea
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A319 Fuel
EFOB at dest.
Does it take in to account RTE RSV or not? In other words, if you change RTE RSV on Fuel prediction page from 0% to 10%, will you see a change in your Destination EFOB?
Or on the other hand, does the RTE RSV sit along with FINAL fuel in a magical place. The FMS then warns you if you will not have this magical number (RTE RSV + FINAL) at your dest.
Merci.
Does it take in to account RTE RSV or not? In other words, if you change RTE RSV on Fuel prediction page from 0% to 10%, will you see a change in your Destination EFOB?
Or on the other hand, does the RTE RSV sit along with FINAL fuel in a magical place. The FMS then warns you if you will not have this magical number (RTE RSV + FINAL) at your dest.
Merci.
Join Date: Dec 2006
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the EFOB in the 'bus is the sum of ALL the fuel the FMC computes you will have at destination.
if you've not yet taken off, EFOB=final reserve + alternate fuel + route reserve + extra fuel.
if you're airborne, EFOB=final reserve + alternate fuel + extra fuel
the difference is not due to airbus but it's jar ops. flight planning makes you take on different quantities at the planning stage (ie taxi + trip fuel + alternate + final reserve + route reserve + extra fuel)
once you're in the air you've only got to manage what fuel you've got on board, provididng you land with at least the final reserve.
so your EFOB doesn't change if you change rte rsrve. what will change is your waiting time (but you'll need to complete the rest of the pages correctly like the right qfu's, winds, etc)
seb
if you've not yet taken off, EFOB=final reserve + alternate fuel + route reserve + extra fuel.
if you're airborne, EFOB=final reserve + alternate fuel + extra fuel
the difference is not due to airbus but it's jar ops. flight planning makes you take on different quantities at the planning stage (ie taxi + trip fuel + alternate + final reserve + route reserve + extra fuel)
once you're in the air you've only got to manage what fuel you've got on board, provididng you land with at least the final reserve.
so your EFOB doesn't change if you change rte rsrve. what will change is your waiting time (but you'll need to complete the rest of the pages correctly like the right qfu's, winds, etc)
seb
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RTE RSV is there to meet reg requirements. I.e. if you need 10% extra route reserve, you put it in the FMS. The FMS will then warn you if you will not meet your FINAL, ALTERNATE, and RTE RSV requirements before you depart.
However, it is interesting that RTE RSV is viewable on the Fuel Prediction page once airborne. Naturally, this number is constantly decreasing as you progress towards your destination. This insinuates that the FMS will still warn you if your fuel falls below requirement, but it will be less and less of a number to be warned of (because RTE RSV is decreasing & FINAL/ALT fuel hasn't changed). Sound right?
However, it is interesting that RTE RSV is viewable on the Fuel Prediction page once airborne. Naturally, this number is constantly decreasing as you progress towards your destination. This insinuates that the FMS will still warn you if your fuel falls below requirement, but it will be less and less of a number to be warned of (because RTE RSV is decreasing & FINAL/ALT fuel hasn't changed). Sound right?
