What was found
NR 1 PROPELLER WILL NOT MX GROUND UNFEATHER WITHOUT BLADE BALANCE ASSISTANCE. GROUND RAN ENGINE, MOVED CLA FOR NR 1 PROP SEVERAL TIMES IN AND OUT OF FEATHER POSITION. AFTER SHUTDOWN UNFEATHERED NR 1 PROP IN GROUND MX MODE. PROP UNFEATHERED WITHOUT ASSISTANCE. NO OTHER DEFECTS NOTED. PERFORMED OPS CHECK OF PROPELLER AUTOFEATHER SYS IN MX MODE IAW AMM TASK 61-20-00-710-805. OPS CHECKED GOOD. ALSO PERFORMED OPS TEST OF PROPELLER ALT FEATHER IAW AMM TASK 61-20-00-710-802. OPS TESTED GOOD. NO FAULTS PRESENT. RETURNED TO SERVICE.