maintenance category

dear people,

on an aircraft information page there is a maintenance category of 83 what does that mean?

Every type of aircraft (or aircraft family) has a unique maintenance category number. You can have up to three different maintenance categories in your fleet, every additional one will raise your maintenance costs by 15% each.

The maintenance number itself carries no value, it´s just simply a number used to distinguish one aircraft type/family from another.

and some planes, such as the CRJ family, may share a number.