75-18-07 BELL: Amendment 39-2346. Applies to Bell Models 206A, 206B, 206A-1, and 206B-1 helicopters certificated in all categories.
Compliance required within 600 hours' time in service after the effective date of this AD, unless already accomplished.
To prevent loss of attaching bolt torque for the main rotor blade hub pillow blocks, accomplish the following:
(a) Remove the four nuts and bolts that attach the pillow block assemblies to the main rotor yoke and remove the washers, P/N 206-010-171-1, and bushings, P/N 206-010- 170-1.
(b) Install four flanged bushings, P/N 206-011-128-1, into the pillow blocks with the flanges facing outboard. Secure the pillow blocks to the yoke with appropriate nuts and bolts, with a washer under each nut, and torque the nut and bolt 60 inch pounds, plus drag (tare) torque of the self-locking nut.
(Note: Compliance with items 1, 2, and 3 of Bell Service Bulletin No. 206-75-3, dated May 1, 1975, or later FAA approved revision, will constitute compliance with the requirements of this AD.)
This amendment becomes effective September 19, 1975.