Service difficulty report · Starflex · Snias AS350B3

Difficulty date
June 24, 2009
Submitted
July 2, 2009
Operation
General aviation
Aircraft
N796AM
Make and model
Snias AS350B3
Aircraft serial
4550
Aircraft time
240 hours, 315 cycles
Engine
Tmeca ARRIEL2B1
Engine time
240 hours, 187 cycles
Part
Starflex
Part number
350A31191701
Part serial
M4070
Condition
Debonded
Location
Rotor Head
Part time
240 hours, 315 cycles
Component
Rotor Head
Component part number
355A31000201N
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 BUSH ONTO STARFLEX ARM. THERE WAS NO INDICATION OF A BOND SEPARATION OR GAP BETWEEN BUSH AND STARFLEX. UTILIZING PROCEDURE FROM MM IN CHAPTER 62.20.00.601 PARAGRAPH 7A. TEST WAS PERFORMED BY APPLING ROTOR BRAKE, FLAPPING BLADE AND LEADING AND LAGGING THE BLADE TO CHECK FOR BOND SEPARATION BETWEEN BUSH AND STARFLEX ARM. WITH NO MOVEMENT OR DISBONDING NOTED TO BUSH, THE SLEEVE ASSY WAS THEN REMOVED TO FURTHER INSPECT 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 THE STARFLEX ASSY.