Originally Posted by Blueskies21

That's the best argument I've seen to support block vs flight.... you're absolutely correct 121.436 a.3 itself says "hours" which fully supports your argument. However 121.436 c says "(c) For the purpose of satisfying the flight hour requirement in paragraph (a)(3) of this section, a pilot may credit 500 hours of military flight time obtained as pilot in command of a multiengine turbine-powered, fixed-wing airplane in an operation requiring more than one pilot." There's no other hour requirement in (a)(3) except the 1000 hrs, so I think we're forced to conclude that must be a flight hour requirement.

You're also correct as far as I know about there not being a block hour limit in 121 or 117 but I'd still be careful about logging more than 9 hours a day in my logbook because I'm not real interested in having a block hour vs flight hour discussion in an interview. As we all know, block hour logging has been the standard but we didn't have a good way to track flight hours, now we do.