5-64 Rotor/Engine Overspeed
1. For rotor overspeeds between 106 and 112%:
NOTE
Refer to Part 3 if a power-on overspeed occurs.
a. Check main rotor and tail rotor dynamic balance. Compare pre-overspeed and
post-overspeed balance.
CAUTION
Any change in rotor dynamic balance greater than 0.3 ips
requires inspection per Part 2.
b. Remove main rotor blades. Drain pitch bearing housings. Remove outer blade
boot clamps and fold boots away from pitch horns. Rotate spindles to verify no
brinelling of pitch bearings.
NOTE
Bearings have a high preload; slight drag is normal. If roughness
is evident, return blade and spindle assembly to RHC for repair.
c. Visually inspect main and tail rotor blades.
d. Check tail rotor drive shaft runout per § 65-21.
2. If an overspeed at or above 112% is reported or suspected or if balance changes or
pitch bearing roughness is evident, perform following inspections in addition to Part 1.
NOTE
Refer to Part 3 if a power-on overspeed occurs.
a. Perform Part 1 inspection.
b. Check coning hinge bolts for evidence of bending. Replace any bent bolts.
c. Coning hinge bolts, washers, and journals must be magnetic particle inspected.
Replace any cracked bolts, journals or washers.
d. Visually inspect hub and dye penetrant inspect any areas suspected of having
cracks. Dye penetrant inspect according to manufacturer's instructions.
e. Reinstall blades and check balance. If a change in balance is evident, rotor system
should be returned to RHC for inspection and/or repair.
3. Refer to RR300 Series Operation and Maintenance Manual (OMM) for overspeed
inspection requirements.
Page 5.44 Chapter 5 Inspections MAY 2015
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