SDR 2009F00084

Service difficulty report · Swashplate · Bell 407

Difficulty date
September 14, 2009
Submitted
September 15, 2009
Operation
General aviation
Make and model
Bell 407
Part
Swashplate
Part number
406010401117
Condition
Misoverhauled
Location
Main Rotor
Stage of operation
IN
How discovered
V
Nature of condition
W
Precautionary procedure
K

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

What was found

DURING THE INSP OF THE SWASHPLATE FRICTION, FOUND THE UPPER ROTATING RING HAD AN EXCESSIVE UP/DOWN MOVEMENT. MOVEMENT WAS ABOUT .1250 INCH PLAY. REMOVED SWASHPLATE ASSY FROM SERVICE. IT HAD 221.6 HOURS SINCE OVERHAUL. AFTER THE SWASHPLATE WAS RETURNED TO THE ORIGINAL OVERHAUL SHOP, IT WAS NOTED THAT ONE OF THE DUPLEX BEARINGS WERE INSTALLED BACKWARDS. THE DUPLEX BEARINGS HAVE A "V" MARK ETCHED ON THE OUTER RACE OF THE BEARINGS TO ENSURE PROPER INSTALLATION. FOR SOME REASON, IT WASN'T.

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