47-32-14 BELL: (Was Service Note 1 of AD-1H-1.) Applies Only to Model 47B Serial Numbers 5, 6, and 10.
Inspection required at intervals not to exceed 100-hours.
In order to prevent misalignment of the tail rotor drive quill and tail rotor drive shaft and powerplant installation, due to the shifting of the engine mount assembly, caused by the insufficient clamping of the engine mount to the rubber mounts, the following action should be taken:
(1) Inspect AN 365-524 nuts on AN 5-20A bolts in the "clamp" ends of the 47-612- 111-1 engine mount assembly for bottoming of nuts. If this condition is found, proceed as outlined in steps (2), (3), and (4).
(2) Remove bolts from "clamps" and install AN 960-516 washers as required under the head of each bolt. Replace bolts in "clamps" and install nuts loosely.
(3) Check installation of engine mount assembly on rubber mounts 47-600-011-1. Front face of left mount "clamp" must be 5/32 inch aft of front face of metal case of rubber mount.
(4) Torque nuts to 100-140 inch-pounds.
(Bell Service Bulletin No. 47C10 also covers this same subject.)