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What the hell is 20 gallons supposed to mean to the tower????? Always give fuels in minutes, or hours/minutes.
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20 gallons would give the tower guy an idea how big a fire he may have on his hands. 1 hour and 10 minutes tells him nothing. He isn't interested in how long you can stay in the air..That's not why he's asking the question.
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Wanna bet? Tower couldn't give a rats ass how big a fire is going to be and really doesn't care. He needs fuel in minutes or hours/minutes in order to know how long he has to get his act together: recover aircraft, divert aircraft; how many planes can he get in before he's got to start working the hole for you to recover; how long before he loses a runway to you (at a single runway airport, how long til the airport effectively closes following your recovery)? etc. Think about it. I can tell you as both a pilot, and CFR firefighter, that tower isn't firefighters, and doesn't get in the fire chief' chili, not ATC, not airport ops, not airport police, NOBODY. Tower doesn't determine how many trucks respond, that's the ARFF crew's SOP. In fact, another tidbit for you all, did you know that in an emergency, the fire chief is in charge once the aircraft lands? You may want to, say, exit the runway, but if the fire chief wants you to stop on the runway, then THAT'S what you do, period. You may want to cancel the IFE, but it'll be at the fire chief's consent; if he wishes to check you over before allowing the IFE to be cancelled, that's his call too.
!+10 in fuel tells ATC a hell of a lot, and that IS why he's asking the question. Where'd you get the info from anyway? Check the AIM.
How big the fire is going to be? You've got me LOL!