m. Check spline teeth on both the tail rotor fork and drive shaft for sealant. Remove sealant if
present. Do not reapply sealant.
n. If none of the conditions identified in paragraph 8.h. through 8.m. exists, apply CPC MIL-C-16173
to studs and reinstall the T/R Head. Make sure that the number 1 stud and hole defined in paragraphs
9. Correction Procedures.
a. Remove T/R Gearbox from the aircraft in accordance with task 6.145 of reference 13.
b. Contact local OLR site to replace all three T/R gearbox output shaft studs.
c. After the T/R Gearbox is returned from the OLR site, reinstall the Gearbox per task 6.145 of
overhead crane/hoist. Do not
d. Apply Corrosion Preventive Compound, MIL-C-116173, Grade IV to studs.
e. Install the T/R Head, ensuring that the number 1 fork hole and stud established in paragraph 8.d.
f. Recheck torque on the three (3) T/R Fork Nuts in accordance with paragraph 8.a. after next flight
but not to exceed 10 flight hours.
(1) If no rotation is found (no loss of torque), inspection is complete. If any nut rotates, retorque
the tail rotor fork nuts in accordance with paragraph 5.61 of reference 13.
(2) Recheck torque in accordance with paragraph 8.a. after next flight but not to exceed 10 flight
hours. If any nut rotates after the second torque check, replace all three studs. If no loss of torque is
detected, inspection is complete.
(3) Repeat torque check at each 250 hour phase inspection.
10. Supply/Parts and Disposition.
a. Parts Required. Items cited in paragraphs 6 and 7 may be required to replace defective items.
b. Requisitioning Instructions. Requisition replacement parts through normal supply channels using
normal supply procedures.