Main Deck Suppression?
Huck and MacRider noted only fire detection on main deck, no suppression. Given that only mitigation is dumping cabin pressure, one ends up in a Catch 22 with increased oxygen feeding a fire below about 8,000 ft as one attempts to land. Any other suppression methods available upon descent (other than the previously cited handheld)?
Is it just too expensive, or beyond the laws of physics to provide fire suppression to the loaded main deck of a 747 or other heavy cargo aircraft? Or is this just an economic issue for the freight carriers?