Oxford Blue - I jump them, not fly them !. .Hi Speed Tape - Thanks, i dug through my dusty books and found a reference copy. It is an Avia prop with an overhaul life of 1000hrs, therefore I presume the schedule in table 2a will apply which explains why it hasn't had a specific Notice 75 type overhaul since new. It is 4 years old now and has only done 50 hrs.