JS1424: Certification Flight Test Plan of a Sikorsky S-61N Helicopter Equipped with the Croman Cargo Sling for 10,000 Pound Class B External Load, 1991-02-25, Box: 16, Folder: 19. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/766951 Accessed June 14, 2026.