Tail Rotor Driveshaft Hanger

BHT-212-CR&OROOTPinion P/N 212-040-500-7WEAR PATTERNAcceptable wear pattern on pinionview FPinion P/N 212-040-500-6Acceptable wear pattern on gearview GNOTES1. Wear pattern inspection: Observe the visible gear contact wear pattern on the concave side ofthe pinion teeth and on the convex side of the gear teeth. The teeth on the pinion have a leftspiral and the teeth of the gear have a right spiral.u°, a.:C.Ofl.cot de.taeQ>0005-0CC>,a_0.3fl.Las#0+ashfl.91°X'O.modpipc..2. The desired wear pattern is shown in Views A and B. A speckled or mottled appearance in theflank of the pinion or top of the gear due to dulite removal is permissable. The wide and not toowell defined toe pattern is characteristic of this gear set. The area of the wear pattern in the flankof the gear is very faint and propper lighting must be used in order to see it.3. Acceptable wear patterns are shown in Views D, E, F, and G. These views show various toe andheel locations, and different severities of the speckled or mottled appearance in the flank of thepinion and top of gear.4. Pattern limits at toe: The pattern may touch the toe or be a maximim of 1/8 inch (3.175 mm) fromtoe on gear (View C). Usually the pattern will touch the toe in the flank of the pinion and at the topof the gear as shown in Views D and E. If the pattern touches the toe but is more than 1/8 inch(3.175 mm) from heel on gear member, then the pattern is off the toe and is not acceptable. Thismethod of inspection must be used, due to the wide toe pattern, to determine whether thepattern is just touching the toe or is running off the toe. Pattern variation at the toe must notexceed 1/32 inch (0.79375 mm).5. Pattern limits at heel: The pattern may touch the heel or be a maximum of 1 /8 inch (3.175 mm)from heel on gear member (View C). Pattern variation at heel must not exceed 1/32 inch (0.79375mm).>~,C1^ 3D1fl..C=tip6. Pattern profile: The pattern in the profile direction must touch or extend over the top of thepinion as shown by Views A, D and F. On the gear, the pattern may be 1/32 inch (0.79375 mm)from the top or may extend over the top. Most of the gear patterns will extend over the top asshown by Views B, E and G. A bright Iline occurring at the top of pinion or in flank of the gear iscause for rejection.CID -°,E212-R-65-12-200000°°u1Figure 65-12. Gear and pinion wear patterns (sheet 2)65-00-00Page 35