Service difficulty report · Swashplate · Bell 407

Difficulty date
January 24, 2000
Submitted
April 13, 2000
Operation
General aviation
Aircraft
N407JR
Make and model
Bell 407
Aircraft serial
53245
Part
Swashplate
Part number
406010418101
Condition
Damaged
Location
Main Rotor
Part time
1,193 hours
Stage of operation
IN
How discovered
O
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

SWASHPLATE SEAL, PN 406-310-407-101, WORE GROOVE IN CAP, P/N 406-010-418-101, CAUSING GREASE FROM BEARINGS BELOW TO ENTER TOP OF SWASHPLATE OUTER EDGE UNDER BOOT. THIS CAN ALLOW GREASE TO CONTAMINATE TEFLON LINED RACES OF UNIBALL ASSEMBLY RESULTING IN CHANGES OF SWASHPLATE FRICTION SETTING WHICH CAUSES STIFFNESS IN CYCLIC AND COLLECTIVE CONTROL INPUTS. SUBMITTER RECOMMENDED CAP BE MADE OF TOUGHER MATERIAL TO PREVENT DAMAGE FROM SEAL, P/N 406-310-407-101.

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