747 APU leak check fire extinguisher
Hey sorry about this as I already posted this question in the engineers section but there wasn't much response so i thought I'd try here...
I'm trying to find out what would be considered the best fire extinguisher to use in APU post maintenance leak checks.
Our procedure on 747 is to start the APU with the doors open to watch for leaks around replaced filters etc but it also states that you should have an "appropriate fire extinguisher" with you because with the doors open the aircrafts onboard fire fighting equipment is compromised.
At the moment there are plenty of extinguishers at my workplace but no one seems to know for sure which one we should be using for this task.
Just wondering if anyone does this check somewhere and could give me some info on what type of extinguisher is best suited (CO2?) and what size is deemed adequate.