47-41-05 BELL: (Was Mandatory Note 17 of AD-1H-2.) Applies to All Models in 47B Series, Through Serial Number 78.
Compliance required at next 100-hour inspection.
In order that the bearings will be securely locked in the gimbal ring, the fiber bearing seals should be replaced with steel bearing seals, P/N 27-120-127-1.
This alteration is covered by Bell Service Bulletin 47C30 dated July 10, 1947.