TM 55-1520-240-23-1
1-92
INSPECTION (Continued)
1-92
REF.
NO.
AREA
NO.
FREQUENCY
INSPECTION REQUIREMENTS
63.
6, 7
WHEN THE ROTOR BLADES ARE POUNDING AGAINST THE DROOP STOPS, OR HAVE
EXPERIENCED VIOLENT AND HEAVY FLAPPING:
a. Droop stops, pitch links, rotor blades and rotary-wing howls for distortion and
visible damage (Task 5-63.3).
b. Damage to droop stops, pitch links, or rotary-wing head requires replacement
of only the affected blades (Task 5-63.3).
c. Identify the removed blades as having experienced excessive flapping.
64.
8, 10
WHEN INTERNAL FAILURE (METAL CONTAMINATION) OF A FLIGHT CONTROL OR UTILITY
HYDRAULIC PUMP OR MOTOR OCCURS:
Flush the effected system. Use a hydraulic test stand equipped with a 3-micron
filter (Tasks 7-9 thru 7-15 or 7-315 thru 7-326).
65.
8
AFTER 50 HOURS OF HELICOPTER OPERATION FOLLOWING APU INSTALLATION:
APU mounting bolts for specified torque (75-85 inch-pounds).
66.
10
WHEN THE COMPASS IS SUSPECTED OF BEING IN ERROR:
Magnetic standby compass indicator for correct reading on all cardinal
headings. Refer to TM 1-1500-204-23.
67.
10
PRIOR TO INSTALLATION OF FREE AIR TEMPERATURE (FAT) GAUGE:
Each time the FAT gauge is replaced, test the replacement gauge. Refer
to TM 1-1500-204-23.
68.
9
AFTER EVERY THIRD MANUAL RELEASE OF THE CENTER CARGO HOOK UNDER LOAD:
Remove hook and perform a special inspection (Task 16-3).
69.
2, 3, 9
UPON COMPLETION OF FIRST PRESSURE REFUELING:
Inspect for fuel leakage after installation of fuel transfer hose P/N 145PS498-1.
70.
4, 5
USE OF EMERGENCY FUEL:
Emergency fuel 100LL (low lead) AVGAS is authorized for use with operation
not to exceed 6 hours cumulative time, after which the engine shall be removed
and returned to depot maintenance. All engine operation using emergency fuel
shall be recorded on DA Form 2408-13.
71.
6
WHENEVER REPLACEMENT AND/OR MAINTENANCE IS DONE ON AFT TRANSMISSION COOLING
FAN ASSEMBLY OR FAN DRIVE SHAFT:
Perform Vibration Test.
72.
6
WHENEVER REPLACEMENT AND/OR MAINTENANCE IS DONE ON COMBING TRANSMISSION
AND/OR DRIVE TRAIN COMPONENTS:
Perform Vibration Test.
73.
4, 5
30 DAYS OR 25
OPERATING HOURS
WHICHEVER OCCURS
FIRST
WHENEVER AN AIRCRAFT IS OPERATED IN SALT LADEN ENVIRONMENT
OR WITHIN 200 MILES OF VOLCANIC ACTIVITY:
Wash engine. Refer to TM 55-2840-254-23.
74.
6, 7
PRIOR TO INSTALLATION OF ANY ROTOR HEAD RECEIVED FROM THE SUPPLY SYSTEM:
PERFORM INSPECTION TO ENSURE FLOW OF LUBRICATING OIL TO THE
HORIZONTAL HINGE PIN BEARINGS.
75.
6, 7
WHENEVER A SWASHPLATE IS INSTALLED:
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