SDR 96ZZZX153

Service difficulty report · Gear Assy · Boeing 757*

Difficulty date
November 29, 1995
Submitted
March 26, 2000
Operation
General aviation
Aircraft
N2FOR
Make and model
Boeing 757*
Part
Gear Assy
Part number
QAR44806
Condition
Bearing Froze
Location
Le Slat Actuator
Component
Sundstrandem · 755299
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

NEEDLE BEARINGS FROZE CAUSING PINS IN 3 PLACES IN PLANET GEAR TO ELONGATE CARRIER HOLES BEYOND TOLERANCE. SCRAP COMPLETE ASSY. CURRENTLY, NEEDLE BEARINGS AND PIN BEING REPLACED WITH PRODUCT IMPROVEMENT CORROSIVE RESISTANT MATERIAL PER SUNDSTRAND SB 27-15. ALSO, CAUSED WEAR IN OUTPUT SHAFT CAUSING REPLACEMENT OF SAME. SUSPECT CAUSE IS WATER IN ACTUATOR WHICH IS VENTED CAUSING RUST TO FORM WHICH CAUSES LOCK-OUT OF SLATS.