Service difficulty report · Damper Arm · Hiller UH12E

Difficulty date
April 25, 1998
Submitted
March 26, 2000
Operation
General aviation
Make and model
Hiller UH12E
Engine
Allsn 250C20B
Part
Damper Arm
Part number
33003
Condition
Fractured
Location
Main Rotor
Stage of operation
HO
Nature of condition
F, D
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) A COMPLETE FRACTURE OCCURRED CAUSING THE ARM TO FAIL IN 2 PIECES. THE DAMPER ARM HOLDS A VIBRATION ABSORBING WEIGHT TO A FLIGHT CONTROL. THE FAILURE OF THE ARM DOES NOT AFFECT CONTROLLABILITY EXCEPT FOR INCREASED CYCLIC CONTROL VIBRATION, HOWEVER, THE LIKELIHOOD OF THE WEIGHT JAMMING THE CONTROL IS HIGH.

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