For Model 214B or B-1 helicopters:

For Model 214B or B-1 helicopters:

Multiply the high-power event total to date by 2; or

b. If the actual operating hours are known; and

If the type of operation is internal load lift operations only, multiply each operating hour by 7;

ii. If the type of operation involves any external load lift operations and the number of external load lift operations is known, use table 1 and multiply the appropriate factor for the average number of external load lift operations by the number of actual operating hours;
iii. If the type of operation involves any external load lift operations, and the number of external load lift operations is unknown, multiply each actual operating hour by 21; or

iv. If the type of operation is unknown, multiply each actual operating hour by 21.

c. If the actual operating hours are unknown:

Assume 900 operating hours per calender year. Prorate the assumed operating hours for partial years;

ii. Calculate the RIN based on the assumed hours and using the criteria specified in requirement b) i through iv, substituting assumed hours for actual operating hours.