Neither pure 1211 nor any HCFC ("Halotron" and other names) extinguisher is a good idea in a cockpit (or any other enclosed space unless you can bail out). 1211 is too toxic, and HCFC’s will probably produce a lethal post-fire environment (ask your doctor about exposure to hydrofluoric acid, which is a pyrolization product of the exposure of HCFC’s in an effective …
The AC says that no specific regulations cover fire extinguishers for use in part 91 aircraft but the AC could be used for guidelines in determining what one to carry assuming that you decide to carry one. If you fly for hire you do need to carry extinguishers as outlined in FAR’s 135 and 121. Go down to the hardware store and pick up a small kitchen halon 1211 or 1301 …
Do you carry a Fire Extinguisher – Mooneyspace.com
After reading enough crash reports it seems like if you make it past the first challenge of surviving the crash you have to deal with the second challenge of surviving the fire. The long bodies have a factory mounted extinguisher behind the passengers feet.
That’s why transport category aircraft are REQUIRED (as applicable) to carry not only cabin & cockpit mounted fire extinuishers, but also automatic lavatory trash can, HRD baggage compartment, HRD APU and engine fire extinuishers.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher