Service difficulty report · Bearing · Skrsky S61NM

Difficulty date
December 8, 2003
Submitted
January 5, 2004
Operation
General aviation
Make and model
Skrsky S61NM
Part
Bearing
Part number
6135345133
Condition
Mismanufactured
Location
M/R Gearbox
Component
Gearbox · Skrsky · 613520600
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

(CAN) BRG IS ONE OF FOUR BABBITT BRS LOCATED IN INPUT HOUSING AND COVER OF MGB. BRG IN QUESTION IS LOCATED IN THE INPUT COVER IN THE NR 1 POSITION. THIS GB WAS BEING TEST RUN BY MFG AC, TEN MINUTES IN TO RUN TEST STAND SHUT DOWN BECAUSE OF AN OVERTEMP ON SUBJECT BRG. INVESTIGATION REVEALED THAT IT WAS DUE TO OIL STARVATION THAT WAS DUE TO THE OIL GALLERY IN BRG BEING LOCATED INCORRECTLY. OIL HOLE WAS LOCATED APPROX. 45 DEG OUT. THIS RESULTED IN NO OIL FLOW TO JOURNAL ON HIGH SPEED INPUT THAT RUNS IN IT. ORIENTATION OF BEARING WAS LOCATED CORRECTLY, THERE IS A PIN CUT OUT ON THE FLANGE OF BEARING TO PRECLUDE THIS POSSIBILITY.