47-41-06 BELL: (Was Mandatory Note 18 of AD-1H-2.) Applies to All Models of 47B Series, Through Serial Number 71.
Compliance required prior to next periodic inspection.
The butt plate screws of the main rotor blade should be staked in accordance with Bell Service Bulletin 47C50 dated July 22, 1947, to prevent them from working loose in service.