Robinsons R66 - 5-60 Special Maintenance and Instructions; 5-61 Tail Skid Strike

5-60 Special Maintenance and Instructions
WARNING
Do not install or return to service any part removed from a
damaged aircraft unless the part can be verified as undamaged.
Return suspect parts to RHC, with details of damage history,
for airworthiness evaluation.
5-61 Tail Skid Strike
A. If evidence of scuffing is found on the tail skid, inspect the rotorcraft as follows:
1. Visually inspect tail rotor blades for evidence of solid object or ground
contact. If tail rotor damage is found, inspect tail rotor for strike per §
5-62.
2. Visually inspect vertical stabilizer for evidence of buckling, cracks,
or loose rivets at tail skid and at lower vertical stabilizer-to-horizontal
stabilizer attach points.
3. Visually inspect tail rotor guard for bending or cracking at attach mounts.
4. Visually inspect the horizontal stabilizer-to-tailcone attach points for
evidence of buckling, loose rivets, or cracking.
5. Visually inspect tailcone for damage and tailcone-to-upper steel tube
structure attach points for buckling and loose attach bolts.
B. For skid bending or breakage, or buckling of lower vertical stabilizer, perform the
following inspections in addition to those listed in Step A.
1.
Perform tail rotor drive shaft runout per § 65-21.
2.
Remove tailcone assembly per § 53-40. Perform dye penetrant inspection
of F020 upper frame at tailcone attach points per § 5-66.
3. Visually inspect tailcone attachment points for elongated holes (0.454-
inch diameter maximum).
4.
Remove empennage assembly per § 53-50. Remove tail rotor gearbox
per § 65-40. Remove paint from tailcone casting using a suitable paint
remover per § 20-70. Dye penetrant inspect casting according to
manufacturer's instructions.
5. Visually inspect horizontal stabilizer attach points for elongated holes
(0.386-inch diameter maximum) loose rivets or buckling.
6.
Remove lower vertical stabilizer per § 53-51. Visually inspect attach
points on vertical and horizontal stabilizers for elongated holes (0.266-
inch diameter maximum); verify no buckling, cracks or loose rivets. Loose
rivets may be drilled out and replaced.
7.
Remove tail rotor guard per § 53-53. Remove paint from forward and aft
attachment points and dye penetrant inspect according to manufacturer's
instructions. Remove guard mount from tailcone by removing four 10-32
screws and dye penetrant inspect same as above step.
MAY 2015 Chapter 5 Inspections Page 5.41