Tail Rotor Driveshaft Hanger

BHT-212-CR&O10. Allow epoxy coating to cure at roomtemperature approximately 60 to 100°F (15.6to 38°C) for a minimum of six hours prior tohelicopter operation. For best results, allowepoxy to cure overnight prior to operatinghelicopter or exposure to oil or grease.0((DDtea)-,+o =":-CDNOTE0.." 0000An alternate source of heat can beused if the temperature does notexceed 180°F (82°C).(ate11. After one hour epoxy curing time atroom temperature, the epoxy coating totalcuring time can be accelerated by placing thecoupling in a temperature controlled oven forone to two hours at a temperature of 150 to180°F (66 to 82°C).12. Following the cure, the TEMP-PLATESshould conform to the contour of the couplingand be free of lifted edges. Indicating dots onTEMP-PLATES must remain the original whiteor light gray with no full or partial blackdiscoloration.13. Accomplish an adhesion test on eachTEMP-PLATE installation. Press a 1.00 inch(25.4 mm) wide strip of high adhesion tapeonto the TEMP-PLATE and epoxy overcoat.The tape should extend beyond the edge ofthe epoxy overcoat. Grasp one end of thetape at approximately 90 degrees from thesurface and remove tape in one abruptmotion. Lifting or peeling of the epoxy coatingor TEMP-PLATE is not acceptable. If lifting orpeeling is detected, remove and replaceTEMP-PLATE by repeating procedure..+J'07mo014. Repeat procedure for all tail rotor driveouter couplings.Q.-°O-(DD065-10. PAINTING - TAIL ROTORDRIVESHAFT HANGER ASSEMBLIES (212-040-600-001 AND -009 WITH MAGNESIUMHANGER AND 204-040-617-005).MATERIALS REQUIRED:_/p°)NUMBERC-204C-305m0-0MATERIALS REQUIRED (CONT)D^100+=O-0NOMENCLATUREPrimerAliphatic Naphtha1. Touch up exposed magnesium surfaceson hanger (14, figure 65-2) with chromic acid(C-103) (BHT-ALL-SPM).E oE2. Mask off bearing, seal, and couplings.Clean hanger in area to be painted with cleancheesecloth wetted with aliphatic naphtha (C-305). Wipe dry with clean cheesecloth beforenaphtha evaporates.3. Apply two spray coats of primer (C-204)0.4 to 0.9 mils (10.9 to 22.9 um) thickness.NOTEApply aluminized lacquer spray coatnot less than thirty minutes and notmore than eight hours, after epoxyprimer is applied.(ac4. Spray on first coat of aluminized, colorNo. 17178 lacquer (C-203) 0.4 to 0.6 milthickness. Allow to dry for thirty minutes toone hour and apply second coat.NOTEIf second coat of lacquer cannot beapplied within time limits noted in0(0 '-'step 5., second coat may be delayedfor up to seventy-two hours, butsurface to be painted shall becleaned with a tack rag prior toapplying second coat.5. Allow last coat of aluminized lacquer todry for forty-eight hours and remove maskingtape.6. Deleted.NUMBERC-103C-203NOMENCLATUREChromic AcidLacquer65-00-00Rev.3 Page 11