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We replace our cables at 3000 hrs or when we add the airplane to our fleet. I've pulled out 1800 hr cables and found broken strands and I've pulled 4000 hr cables an they were good. We replace them with stainless steel and before I install the I let them soak overnight in a Mil spec cable lube that I used on Sabreliners. It takes @ 6 or 7 hrs to change them and rigg the flaps. I also found that it is easer to remove the cable pulleys rather then removing the guard pins. They can be almost impossable to get them back in and bent over.
Hope this help
Kim
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