Page 63.12 Chapter 63 Main Rotor Drive System MAY 2015
63-31 Pad Replacement
Refer to R66 Illustrated Parts Catalog (IPC) Figure 63-9.
A. Arm Removal
NOTE
Rotor brake pad minimum thickness is 0.030 inch on both
arm assemblies. Replace arm assemblies when pads are worn
beyond limit.
1. Remove rotor brake per § 63-30.
2. Remove hardware and spacers securing G109-1 arm assembly to (2) G111-1 bars
and G113-1 & -2 links. Remove D774-4 spring.
3. Remove hardware and spacers securing G110-1 arm assembly to (2) G111-1 bars
and B112-2 lever. Loosen fastener securing G113-1 & -2 links to B112-2 lever.
B. Arm Installation
1. Refer to Figure 63-2. Lubricate spacers with A257-1 grease and install in new
G110-1 arm assembly. Install hardware securing G110-1 arm assembly to (2)
G111-1 bars and B112-2 lever, but do not torque.
2. Lubricate spacers with A257-1 grease and install in new G109-1 arm assembly.
Install D774-4 spring, and install hardware securing G109-1 arm assembly to (2)
G111-1 bars and G113-1 & -2 links. Standard torque all bolts and torque stripe per
Figure 5-1.
3. Install rotor brake per § 63-30.
63-40 Rotor RPM
1. Remove tailcone cowling assembly per § 53-23.
2. Refer to Figure 63-1. Measure gap between both F908-1 yoke assembly magnets at each
103SR13A-3 (Hall effect) sender. Verify gap is between 0.030 ± 0.010 inch.
3. As required, loosen sender jam nuts and adjust to obtain 0.030 ± 0.010 inch gap.
Special torque jam nuts per § 20-33 and torque stripe per Figure 5-1.
4. Install tailcone cowling assembly per § 53-23.
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