Inspections
Believe the requirement is only for a 100 hour, not 50. Some US schools opt to service at 50 anyway, although this is self (and perhaps insurance?) -imposed inspection. If the aircraft is N reg and for private use (not rented out; not used to instruct), there is no requirement for the 100 hour, just the annual as far as I am aware (part life limits excepted). Prudence may dictate a more regular regime though...
TT