52-01-03 BELL: Applies to All Models 47B and 47B3 Helicopters and to Model 47D Helicopters Serial Numbers 1 to 100, Inclusive.
Compliance required at next 300-hour overhaul, but not later than March 1, 1952.
To provide lubrication to prevent seizing of the bearings, replace the existing damper lever and link assemblies (P/N 47-140-158 and -159) with the 47-140-158-1 lever and 47-140- 159-1 link assembly.
(Bell Service Bulletin No. 78 covers this same subject.)