Tail Rotor Driveshaft Hanger

BHT-212-CR&O65-42. Repair.NUMBERC-005C-100C-108C-114C-116C-5000C-423C-464E(o)MATERIALS REQUIRED0)"(!)NOMENCLATURESolid Film LubricantChemical Film MaterialBrush CadmiumPlating SolutionCorrosion TreatmentChromic AcidCrocus ClothAbrasive Cloth orPaper.India Stone1. Replace parts exceeding allowable limits.::rvim`)"-Q-4-E2. Replace all seals, gaskets, preformedpackings, and standard hardware onreassembly.3. Replace parts which are cracked, broken,warped, distorted, have malformed threads orfail to pass inspection.0,04. Replace all parts which exceed allowabletolerances (figure 65-22).5. Replace cases and output sleeves havingloose liners or corrosion between steel linerand magnesium case or sleeve.6. Replace gearbox cases which havecorrosion damage in excess of limits (figure65-24).7. Replace cases with structural damage inthreads exceeding repair limits (figure 65-24).8. Repair minor scratches, nicks, and pits onnon-critical surfaces with crocus cloth (C-500).9. Repair minor nicks, scratches, and burrson splines and gear teeth by dressing withIndia stone (C-464).10. Replace oil level sight glass (22, figure65-21) if cracked, crazed, scratched ordiscolored. Replace indicator (20) if paint ispeeled.-l.L()(00Q))O.^Oi''-1,z-0_p)1110-,30m a)_-.11. Replace bearings which are spalled,scored, brinelled, pitted, discolored fromoverheating, or which have damaged orbroken retainers, or roughness.12. Repair damaged stud holes by drillingout damaged thread. Clean out diametershall not exceed major thread diameter ofinternal threads. Break all sharp edges,except in thread areas, clean out small venthole in bottom of threaded hole. Treatrepaired surfaces with chemical film material(C-100).(Q-13. Repair damaged studs (BHT-ALL-SPM).Stud height, prior to installation of shim plateon input quill port, shall be 1.450 in. (36.83mm) (minimum). Stud height on output portshall be 0.850 in. (21.59 mm) (minimum).Stud height on pitch change port shall be0.785 in. (19.939 mm) (minimum).14. Repair case (9, figure 65-21), which hascorrosion within allowable limits (figure 65-24), as follows:a. Polish out, within acceptable depthlimits, any sharp edges which might damagepackings upon installation.b. Immerse corroded case in chromic acid(C-116) bath to completely remove corrosionproducts (BHT-ALL-SPM)..................CAUTIONCORROSION REMOVAL PROCESSSHALL BE MONITORED TOENSURE MACHINED DIMENSIONSARE MAINTAINED AND CADMIUMPLATING IS NOT REMOVED FROMSTUDS.c. Immediately after corrosion removal,apply corrosion treatment (C-114).65-00-00Page 60