51-10-01 DOUGLAS: Applies to All Model DC-6 Aircraft. \n\n\tCompliance required at first engine change after receipt of parts but not later than June 1, 1952. \n\n\tIn order to increase the strength of the wing flap operating link assembly at wing Station 281, and to replace the temporary reworks of the present links as outlined in Douglas General Service Letter DC-6 No. 60, the following should be accomplished: \n\n\t\t(a)\tReplace wing flap operating link assembly, P/N 4330069, with new heavier link, P/N 4393814. \n\n\t\t(b)\tVisually inspect 4330069 links every 60 hours of operation until replacement per item (a), is accomplished. If links have been reworked and shotpeened per Douglas General Service Letter DC-6 No. 60, inspect every 500 hours of operation until replacement is made. \n\n\t(Douglas General Service Letter DC-6 No. 60 covers this same subject.)