Fire extinguisher mx requirements
So The FSDO was out for normal surveillance on a part 141 flight school for which I am affiliated. One of the inspectors (there were four present and are all new to the office) noted that there was no record of monthly NFPA 10 maintenance (heft check) for a handheld fire extinguisher that is installed in one of the flight training aircraft (PA28-161 Warrior). He gave me the impression that he was going to push this issue further. He went so far as to say that we could remove the extinguisher from the aircraft for relief from the additional mx requirements.
I did not comment to him (and did not remove the extinguisher), but am unaware of any requirement to perform this (or other NFPA 10 mx) on a small part 91 aircraft. All that I have ever done with these extinguishers is to inspect them during the required aircraft inspections (Annual/100hr. in this case).
I am pretty familiar with NFPA 10, and understand how it is legally imposed in other types of operations (121, 135 etc). It has been my understanding that the same requirements do not exist for part 91 aircraft subject to Annual/100hr. inspections. I am aware that NFPA 10 is a "standard" however, in general, I think its requirements are a good idea for everyone. Just not sure of their legality in this case.
Any thoughts would be appreciated.