TM 55-1520-240-T
2-1.4 VIBRATION FREQUENCY IDENTIFIED AS 675 CYCLES/MIN (3/REV)
2-1.4
FAULT ISOLATION PROCEDURE
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit,
NSN 5180-00-323-4692
Chadwick Helmuth Model 192 Spectrum Analyzer
with Vib Pickups
References:
TM 55-1520-240-23
TM 55-1520-240-10
Equipment Condition:
TM 55-1520-240-23:
Battery Connected
Electrical Power On
Hydraulic Power On
Visual Check Performed
Materials:
90° Bracket for Installation of Vib Pickup to Nose
Absorber
Personnel Required:
Medium Helicopter Repairer
Army Rotary Wing Aviator (2)
Technical Inspector
2-8
Change 5
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