47-32-10 BELL: (Was Mandatory Note 10 of AD-1H-1.) Applies to Models 47B and 47B3 Helicopters.
Compliance required at the next 50-hour transmission teardown inspection.
Replace the main rotor mast assembly with mast assembly, 47-130-100-2.
(Bell Service Bulletin 47C24, dated June 26, 1947, also covers this same subject.)