Quote:
Originally Posted by Acey
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.
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I had actually not thought of that factor, controllers obviously would be concerned with endurance. I had always assumed is was for ARFF as (to me) it seems like the primary concern would be quantity and what they would potentially be dealing with on the ground.