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 AIRCRAFTS
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.
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Change 3