Posted for "Field, Peter B" <peter.b.field@boeing.com>:

 Gents:
 
     Halon is just as deadly, if not more so, as is CO2 to humans in a
 crew compartment since it removes oxygen.  We use halon in the engine
 bays of the F/A-18 even though there is a lot of ventilation going on.
 In this case the fire control concept is to first stop fuel flow to the
 affected engine; and then discharge the halon to extinguish the
 conflagration on a one shot basis.  Having a fire up front is deadly so
 it's really important to be able to and that you do check for leaks
 every so often.
 
 
 
 Pete