Rich S. wrote:

Establishing and maintaining the required concentration of Halon is
difficult, if not impossible, in an open space. Even closed environments
such as sealed buildings are difficult to permeate. It is likely impossible
under an aircraft cowling when the plane is moving.

I disagree. Have you ever used a Halon fire extinguisher? Back in the
Reagan era when the defense departement had a lot of money and Halon
hadn't yet been restriced, we were given training where we used large
Halon hand extinguishers to put out diesel fuel fires set in pans
outside.

If the Halon is removed and there is still a source of ignition, the fire
will take up right where it left off.

If you've got a cabin fire, that's a horse of a different smell.


With a flood system and a relatively closed space it takes a long
time for the Halon to disapate. Try lighting a lighter in a space
near where halon has been discharged.

Of course, much of what you said also applies to CO2. If the CO2
doesn't cool down the metal (which admittedly it has a higher
capacity to do than Halon), then you have the same (actually larger)
reignition problems.