Fire Extinguisher

[Esser]

I have a small halon one mounted on right in front of the passenger stick on the sloped floorboard where it meets the flat board. Easy to get at and not in the way at all.

[jrthomas]

So educate me. I see Bass Pro Shops has boat type fire extinguishers from $29.99 to $39.99. All engine equipped boats are required to have one. They're supposedly good for fuel and electrical fires. Spruce cabin type extinguishers start at $161.99 up to $1029.00. Considering everything aviation related is priced "skyward", are these expensive extinguishers superior to the boat type?

[Esser]

They won’t corrode your plane when the media settles everywhere

[Dave S]

Esser's comment on corrosion and fire extinguishers is to be taken seriously.

The ingredient in "dry chemical" fire extinguishers (which I believe is what is used in boat FEs) is Ammonium phosphate (monoammonium phosphate or diammonium phosphate but often a combination of both)

Ammonium phosphate is a primary ingredient in agricultural fertilizers which supplies nitrogen and phosphorous.

Bottom line is it is a salt which, with a little atmospheric moisture, makes a really, really good corrosive electrolyte.

Think of discharging a dry chem FE inside an airplane as backing up a fertilizer spreader to your panel/cockpit and letting 'er rip.

[Bartman1959]

I'm pretty sure most dry chemical fire extinguishers warn against using in confined spaces.