65-21 Runout
1. Remove A231 (tailcone) plug assemblies.
2. Assemble MT260-6 tail rotor drive shaft runout tool and a calibrated dial indicator.
3. Refer to Figure 65-2. Using appropriate combination of extension(s), insert tool
through tailcone inspection hole. Verify foot squarely contacts tail rotor drive shaft
when pressing dial indicator firmly against inspection hole edges. Have a second
person rotate rotor system by turning tail rotor hub.
4. Rotate rotor system slowly, smoothly, and for several revolutions until the technician
is able to determine the average indicated movement. Maximum runout is 0.025 inch.
5. Repeat steps at each inspection hole. Record values as required (recommended during
100-hour or annual inspection).
FIGURE 65-3 DAMPER ORIENTATION
MAY 2015 Chapter 65 Tail Rotor Drive System Page 65.5
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