Hey Eliacim: I have not read the 1320 pound STC, but if it includes the other stuff of the 415-D, you are required to modify the orifices as follows: The orifices for the main and nose gear piston should be revised as follows: Serial Numbers Orifice Size Main Gear 113 thru 812 .067” diameter Nose Gear 113 thru 1622 .281” diameter I believe you will find that the orifice size will have to be increased slightly to meet the requirements (as spelled out in the type certificate 718) Not reduced Lynn Nelsen
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