When I did Robinson Safety Course with Tim Tucker this question was asked. Reply was 2200hr and 12 yearly are different (obviously). 2200hr is a full rebuild. 12 years is a partial rebuild.
Both are expensive and we were told insufficient difference in cost to make 12 yearly worthwhile unless a high time to run to 2200 hr rebuild.
My question - what is the difference in total cost of 2200hr vs 12 yearly?
John