59-02-02 DOUGLAS: Applies to All DC-7 Series Aircraft. \n\n\tCompliance required as indicated. \n\n\tThere have been several incidents of the engine cowling moving forward in flight and striking the propeller. This has been caused by incorrect installation of the cowling on its mountings. In order to prevent incorrect installation of the cowling, more positive means of indexing and aligning must be provided. Pending installation of these means, special inspections are established. \n\n\t(1)\tEffective at next cowl removal, unless modification per paragraph (2) has already been accomplished, perform a special inspection each time any segment of cowl is removed and replaced to assure that cowl indexing means are in satisfactory condition and that cowling is properly positioned. \n\n\t(2)\tNot later than November 1, 1959, install improved supports for indexing and aligning the top left and right-hand cowling segments of each of the four powerplants. Douglas Service Bulletin No. 131 dated August 21, 1956, revised February 5, 1958, covers an acceptable means of accomplishing this change.