58-05-01 DOUGLAS: Applies to Goodyear Outboard Wheel Halves P/N 9531419 Installed on Douglas DC-7C 17.00-20 Main Wheel Assembly P/N 9540934. Affects Wheel Assemblies Manufactured Prior to Serial Number 157-1569 and Also Wheel Halves Serial Numbers 1573, 1574, 1575, 1595, 1596, 1597, 1771, 1833 and 1834. \n\n\tCompliance required at the first wheel or tire change after May 10, 1958, and at each 100 landings thereafter. If wheel inspection is performed during any portion of the 100-landing interval, no inspection will be required until the next 100 landings thereafter. \n\n\tAs the result of failures of Goodyear wheel half P/N 9531419 and in order to reduce the possibility of recurrence of these failures, the following inspection is required: \n\n\tInspect the outboard half P/N 9531419 in accordance with Goodyear Service Letter DC7C-3, dated January 15, 1957, or equivalent (Goodyear Service Letter DC7C-6, dated November 15, 1957, covers this same subject.) The inspections may be adjusted to tire change periods where the individual operators service experience justifies.