60-07-08 WRIGHT: Amdt. 121 Part 507 Federal Register March 29, 1960. Applies to All R-1820-103 Engines Installed In Helicopters.
Compliance required at first engine overhaul after June 1, 1960, but not later than December 31, 1960.
To alleviate failures of the master rod assemblies, strengthened master and articulating rods with associated parts must be installed in accordance with the instructions contained in Wright Aeronautical Division Service Bulletin No. C9-353.