65-30 (Tail Rotor Driveline) Intermediate Flex Plate Shimming
NOTE
The tail rotor driveline is shimmed for minimal preload.
1. Refer to Figure 65-1. If not previously accomplished, remove hardware securing
intermediate C947-3 flex plate assembly to F196-1 (tail rotor) fan shaft aft flange and
D224 tail rotor drive shaft assembly forward yoke. Remove flex plate, and temporarily
support aft portion of fan shaft.
2. Measure flex plate thickness at bonded washers (4 places) to determine average thickness:
(1st place) inch
(2nd place) + inch
(3rd place) + inch
(4th place) + inch
Total = inch
Total ÷ 4 =
inch (Flex plate average thickness)
3. a. Position F196-1 fan shaft aft flange arms and D224 tail rotor drive shaft assembly
forward yoke flange arms at 3 o’clock and 9 o’clock positions (horizontal). Measure
gap between arms to determine average gap:
(3 o’clock position) inch
(9 o’clock position) + inch
Total = inch
Total ÷ 2 =
inch (Average gap between flange arms)
b. Rotate D224 tail rotor drive shaft assembly 180º, and repeat step a:
(3 o’clock position) inch
(9 o’clock position) + inch
Total = inch
Total ÷ 2 =
inch (Average gap between flange arms)
4. Evaluate flange straightness by calculating the difference between the 3 o’clock
positions in steps 3a and 3b. Also calculate the difference between the 9 o’clock
positions in steps 3a and 3b. If either calculated difference exceeds 0.015 inch, either
one or both flanges are bent and require replacement.
Page 65.8 Chapter 65 Tail Rotor Drive System MAY 2015
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