TM 55-1520-240-T
2-1.3 VIBRATION FREQUENCY IDENTIFIED AS 225 RPM (1 /REV)
2-1.3
FAULT ISOLATION PROCEDURE
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Mechanic’s Tool Kit,
NSN 5180-00-323-4692
Sharp PC 1500A Track and Balance Computer
Vibrex Model 177M6A or 177M7A
Vibrex Accessory Set
Materials:
None
Personnel Required:
Medium Helicopter Repairer (2)
Army Rotary Wing Aviator (2)
Technical Inspector
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
Helicopter Prepared for In-Flight Blade Balancing
Tracking Targets Installed
Visual Check Performed
2-4.8
Change 5
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