Aerial ladder certification
Has anyone ever heard of an aerial ladder being certified at a lower weight due to age or inability to make the original rated capacity?
We have a 1990 75' aerial which was rated at 500lbs until 2012. The last two years it has been tested at 400lbs. Testing was conducted by a third party and certified as compliant with NFPA 1911, but all I can find in 1911 is a reference to "rated capacity". Can someone other than the manufacturer change the rating? If they can change the rating, isn't it supposed to be in 250lb increments? I called the testing company but they gave me the run around and no answers.
I know we still exceed the minimum 250lb rating, but I'm concerned with the age and reliability of the rig-especially since they are in the process of putting a new motor in it.