Service difficulty report · Pinion Gear · Aerosp ATR42*

Difficulty date
May 27, 1995
Submitted
March 26, 2000
Operation
General aviation
Make and model
Aerosp ATR42*
Engine
Pwa PW121
Part
Pinion Gear
Part number
310960401
Condition
Spalled
Location
Rh Second Stage
Part time
5,570 hours
Component
Pwa
Stage of operation
IN
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)ROUTINE FILTER CHECK FOUND ALLOY STEEL FLAKES IN THE SCAVENGE FILTER. RIGHT HAND SECOND STAGE PINION GEAR HAD LOST MATERIAL FROM PATCHES IN THE FRONT 25 PERCENT OF THE TOOTH. #15 BEARING RETAINING BOL TS WERE ALL LOOSE AND WERE REMOVED BY FINGERS ONLY. #15 BEARING BORE WAS A POST SB 20985 SLEEVE, WAS OVERSIZE, OUT OF ROUND AND OUT OF TRUE POSITION AND ALIGNMENT WITH THE #18 AND #19 BORES.

More about the Aerosp ATR-42