Tail Rotor Driveshaft Hanger

BHT-212-CR&OSEAL (13) PARTIALLY SEATEDSEAL (13) FULLY SEATEDINTERNALSPLINES (12)INNER COUPLING (10) USEDAS BACK-UP TO PUSH LIPOF SEAL 03) UPOUTER COUPLING (11)INSTALLEDINVERTED ON INNERCOUPLINGDETAIL B212-R-65-28-2212-040.003-17Figure 65-28. Tail rotor gearbox input quill (sheet 2)L!)6. Inspect inner and outer couplings (10 and11, figure 65-28) for chipped, pitted, cracked,and excessively worn teeth (figure 65-29).0 n"0(Dg(1Y0-0(OD(ODQ.-NOTEOvertemperature indicator dots ontemperature indicator TEMP-PLATES are of a white or light graycolor and turn black when exposedto an overtemperature condition.Chemical contamination can alsocause the indicating dots to turnblack.7. Inspect outer coupling (11, figure 65-28)temperature indicator TEMP-PLATES forevidence of overtemperature indication. Ifovertemperature indication is noted, performcoupling overtemperature inspection asfollows:a. Inspect outer coupling cadmium platingfor being discolored (circumferential tan orlight brown band) or blistered. If cadmiumplate discoloration or blistering is found,replace outer coupling and inner coupling.b. Inspect gear teeth of outer couplingand inner coupling for being discolored(brown or blue) in the normally bright contactpatterns. If discoloration is found, replaceouter coupling and inner coupling.c. Inspect outer coupling and innercoupling under 5x to 10x magnification forteeth exhibiting signs of metal smearing ortearing is found, replace outer coupling andinner coupling.d. Inspect grease from coupling for beingvery viscous (thick) and having a strongpungent odor. If grease is found to be viscous(thick) and having a strong pungent odor,replace outer coupling and inner coupling.NOTEIf TEMP-PLATES are to be replaced,replace TEMP-PLATES aftercompleting entire inspection andrepair procedures and couplingsQ=3have been determined serviceableand prior to assembly.(6D65-00-00Page 74 Rev. 3