5-62 Tail Rotor Strike
The tail rotor strike inspection is listed in two parts. Part 1 concerns damage received
by a tail rotor blade due to contact with a small stone, tall grass, or some small object
contacting rotor blade in free air. Part 2 is concerned with sudden stoppage of tail rotor
due to ground or solid object contact causing bending or shearing of a tail rotor blade or
blades.
1. Inspect tail rotor blades per § 64-30 and perform Part 2, step (a).
2. If one or both tail rotor blades contact ground or a solid object causing bending or
shearing of blades a tail rotor sudden stoppage inspection must be performed. Inspect
per following procedure:
a. Perform tail rotor drive shaft runout per § 65-21. If runout exceeds 0.025 inch at
any location the shaft must be replaced or repaired.
b. Remove tail rotor assembly per § 64-10 and tail rotor gearbox per § 65-40 and
return to RHC.
c. Visually inspect D224 tail rotor drive shaft for evidence of twisting, nicks, dents or
scratches. Nicks and scratches may be polished out to a maximum of 0.003 inch
deep. Evidence of twisting or dents is cause for replacement of the drive shaft.
d. Remove yokes from each end of tail rotor drive shaft. Inspect arms for deformation
and holes for any elongation. Strip paint and dye penetrant inspect yokes according
to manufacturer's instructions (forward yoke may be magnetic particle inspected).
e. Remove F196-1 (tail rotor drive) shaft weldment per § 65-10. Strip paint back at
least 2 inches from welds at both ends of shaft and dye penetrant or magnetic
particle inspect. Verify no cracks.
f. Replace C947-3 plate assemblies (forward, intermediate, and aft).
g. Visually inspect F193-2 hanger and F172-3 (bearing) housing for cracks or
deformation.
h. Visually inspect tailcone and empennage for evidence of a tail rotor blade strike.
i. Visually inspect main rotor system.
Page 5.42 Chapter 5 Inspections MAY 2015
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