Quote:
Originally Posted by Lubicon
Some pilots reply in endurance (hours), some in weight (lbs/kilos) and others in volume (litres/gallons).
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Yeah I think it just comes down to either SOP of a given airline or workload at that moment. In an airliner, volume in litres/gallons is not a metric immediately available to the crew, the easiest is the total mass on board in lbs/kilos. When I controlled, I'm pretty sure we needed it as endurance but that requires a bit of a calculation on the part of the crew, and if the emergency is something that has a big impact on fuel burn like an engine out then it might take a couple minutes to figure out when they could instead be running checklists/troubleshooting.