Service difficulty report · Starflex · Snias AS350B2

Difficulty date
June 29, 2009
Submitted
July 10, 2009
Operation
General aviation
Aircraft
N6084W
Make and model
Snias AS350B2
Aircraft serial
2672
Aircraft time
8,638 hours, 13,233 cycles
Engine
Tmeca ARRIEL1D1
Engine time
6,135 hours, 7,113 cycles
Part
Starflex
Part number
350A31191701
Part serial
M3502
Condition
Debonded
Location
Main Rotor
Part time
234 hours, 311 cycles
Component
Rotor Head
Component part number
355A31000106
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

DURING A DAILY INSP, CRACKS WERE NOTED ON MAIN ROTOR STARFLEX IN ADHESIVE BOND FILLET THAT BONDS THE BUSH ONTO THE STARFLEX ARM. THERE WAS NO INDICATION OF A BOND SEPARATION OR GAP BETWEEN THE BUSH AND STARFLEX. UTILIZING THE PROCEDURE FROM MM 62.20.00.601 PARAGRAPH 7A. TEST WAS PERFORMED BY APPLING THE ROTOR BRAKE AND FLAPPING THE BLADE AND LEADING AND LAGGING BLADE TO CHECK FOR BOND SEPARATION BETWEEN BUSH AND STARFLEX ARM. WITH NO MOVEMENT OR DISBONDING NOTED TO BUSH SLEEVE ASSY WAS THEN REMOVED TO FURTHER INSPECT THE BUSH. BY GRIPPING BUSH WITH THE HAND IT COULD BE ROTATED ABOUT .0625 OF A TURN THUS CONFIRMING A DISBONDED BUSH WHICH IS CAUSE FOR REPLACEMENT OF STARFLEX ASSY.