TM 55-1520-240-23-1 1-92 INSPECTION    (Continued) 1-92 REF. NO. FREQUENCY INSPECTION REQUIREMENTS 8. 50 HOURS VISUALLY INSPECT COMBINER TRANSMISSION SUPPORT FITTINGS P/N 114S3820-1 AND-5 FOR CRACKS. 8.1 50 HOURS (IF INSTALLED) ENGINE AIR PARTICLE SYSTEM. CHECK BLADES OF SCAVENGE BLOWN IMPELLER FOR WEAR USING BLADE EROSION GAUGE. REFER TO TASK 16-126, TM 55-1520-240-23-10. NOTE AIRCRAFT 84-24152 AND SUBSEQUENT WITH COMBINER TRANSMISSION SUPPORT FITTINGS 234S3820-1 AND -2 INSTALLED DO NOT REQUIRE INSPECTION. 9. 50 HOURS ENGINE NO. 1 AND ENGINE NO. 2 DUAL CHIP DETECTORS FOR CONTINUITY. IF READING IS  400 OHMS  OR LESS, REMOVE, INSPECT, AND CLEAN CHIP DETECTOR. IF CHIPS ARE NOTED, PERFORM OIL CONTAMINATION INSPECTION. REFER TO TM 55-2840-254-23. 9.1. 50 HOURS PERFORM ENGINE WATER WASH IN ACCORDANCE WITH TM 1-2840-265-23 OR TM 55-2840-254-23. 10. 50 HOURS PERFORM VIBRATION TEST ON COMBINING AND AFT TRANSMISSION COOLING FAN ASSEMBLIES (TM 1-6625-724-13&P). 10.1. 50 FLIGHT HOURS VISUALLY INSPECT UPPER DAMPNER ATTACHING LUG BUSHINGS P/N 145R3116-10 FOR SLIPPING/LOOSENESS. (THIS INSPECTION ONLY REQUIRED IF BUSHING WAS FOUND LOOSE OR SLIPPING DURING INITIAL INSPECTION.) 10.2. 50 FLIGHT HOURS OR 100 CALENDAR DAYS TAKE A  THREE OUNCE  HYDRAULIC OIL SAMPLE FROM THE AIRCRAFT’S NUMBER ONE, NUMBER TWO AND UTILITY HYDRAULIC SYSTEMS (TASK 7-8.1). SEND SAMPLES TO THE UNIT DESIGNATED ARMY OIL ANALYSIS PROGRAM (AOAP) LABORATORY FOR ANALYSIS. NOTE CORRECT HYDRAULIC SAMPLING PROCEDURES ARE PARAMOUNT TO A SUCCESSFUL SAMPLING PROGRAM. THE MAJORITY OF BAD SAMPLES ARE THE RESULT OF IMPROPER SAMPLINGS, INADEQUATE DRAINING AND TAKING OF SAMPLES. 10.3. 50 FLIGHT HOURS PERFORM LUBRICATION IAW LUBRICATION CHARTS. 10.4. 50 FLIGHT HOURS TAKE GREASE SAMPLE FROM FORWARD AND AFT SWASHPLATE BEARINGS. 10.5. 50 FLIGHT HOURS PERFORM DIGITAL ENGINE CONTROL UNIT (DECU) DOWNLOAD. SEE TM 1-2840-265-23 FOR INSTRUCTIONS ON DOWNLOADING AND RESETTING THE DECU. 11. 100 HOURS ALL FORWARD AND AFT ROTOR HEADS. CHECK TORQUE ON PITCH LINK BOLTS (TASK 5-99.1). 12. 100 HOURS NO. 1 AND NO. 2 ENGINE TRANSMISSION FAIRING (FAIRING REMOVED) FOR CHAFING, CRACKS, DENTS, TWISTING, AND LOOSE OR MISSING HARDWARE. INSPECT ENGINE TRANSMISSION FOR LEAKS, EVIDENCE OF CHAFING, CRACKS, SECURITY OF COMPONENTS AND CORROSION. PAY PARTICULAR ATTENTION TO THE MOUNT FLANGE. INSPECT LUBRICATION HOSES AND FITTINGS FOR LEAKS, CHAFING, DAMAGE, AND PROPER SUPPORT. WIRE BUNDLES AND CONNECTORS FOR SECURITY, DAMAGE, CHAFING AND PROPER SUPPORT. AT INSTALLATION, CHECK FOR SECURITY AND INTERFERENCE. 13. 100 HOURS RETORQUE FWD AND AFT ROTARY-WING FIXED DROOP STOP RETAINING BOLTS. 14. 100 HOURS IF AIRCRAFT IS OPERATED WITH DROOP STOP SHROUDS INSTALLED, INSPECT DROOP STOP STOP BOLTS AND LUGS (TASK 5-53). 15. 100 HOURS PERFORM LUBRICATION REQUIREMENTS IAW LUBRICATION CHARTS. 1-344 Change 3