Service difficulty report · Planetary Gear

Difficulty date
December 22, 2009
Submitted
January 15, 2010
Operation
General aviation
Engine
Pwa PT6A28
Part
Planetary Gear
Part number
E3035030
Condition
Mismanufactured
Location
2nd Stage
Part time
225 hours
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

2ND STAGE PLANET GEARS HAVE ON THE INTERNAL BORE A PRESS FIT BUSHING (PN E3035030). THIS BUSHING HAS ITS BORE COATED OR SPRAYED WITH BRONZE MATERIAL INTRODUCED BY SB 1404. DURING OUR INSP WE OBSERVED THAT THIS BRONZE COATING HAD ROTATED FROM ITS ORIGINAL POSITION INDICATING THAT IT IS LOOSE. HAVING SEPARATED FROM THE INTERNAL WALL OF THE BUSHING. THIS SITUATION COULD LEAD TO METAL CONTAMINATION AND GEARBOX FAILURE. THIS IS MFG DEFECT.