56-25-02 BELL: Applies to All Model 47 Series Helicopters Except the Following: Model 47G Serial Numbers 1529, 1530, 1687 and Up; Model 47G2 Serial Numbers 1505, 1506, 1508, 1617 and Up; Model 47H1 Serial Numbers 1369, 1371 and Up; Model 47J.
Compliance required by December 22, 1956.
Excessive tolerance resulting from wear of the tail rotor pitch change rod assembly can result in the loss of the S1RP or 7R4AX1C bearings. To preclude loss of these bearings, the AN 960-416 washer or washers, P/N 47-641-113-1, made to the dimensions 0.562-0.557 inch must be replaced with washers that have an O.D. dimension not greater than 0.552 inch or less than 0.549 inch.
(Bell Mandatory Service Bulletin No. 113 Revision B dated October 23, 1956, covers this same subject.)
This supersedes AD 56-20-02.