Engine Fire Extinguisher Overhaul

[sph33r]

Good Morning, I would like to ask if there is a difference in the overhaul process of Engine Fire Extinguisher Cylinders between those for aircraft and their non aviation counterparts.... eg extra tasks or tests under different pressure conditions.

[piggybank]

I have serviced non-aviation fire extinguishers, and also those on helipads and helidecks offshore. A person with the knowledge and the permission can do this. The fire extinguishers for engine fires protection are a different beast. If found underweight on scheduled inspection, fired off or due hydrostatic test, these extinguishers have to go back to an approved service centre for maintenance, testing and refill. Other than the fire extinguisher removal itself and the removal of the explosive squibs there is little that can be done before sending off to the approved service centre.

[sph33r]

thanks for the reply, what i was interested in is a task list (fro example) for each case. Does an aviation cylinder undergo extra tests. I dont plan on servicing it myself :)

[Krystal n chips]

Yes. Done properly, the test can identify pressure leaks occurring through the intake or exhaust valves, by the rings, or through head or barrel cracks. The procedure involves applying a known pressure into the cylinder bore with the piston at Top Dead Center (TDC) and measuring the reduced pressure in the combustion chamber due to leakage.

For TCM engines, the pressure is generally input through the top spark plug port and the pressure is measured with the differential compression tester.

Always useful to know when the topic is, erm, pressure testing fire extinguishers....

[weemonkey]

Always useful to know when the topic is, erm, pressure testing fire extinguishers....

there is also the drop down test.

[sph33r]

which part of the discussion did i miss?