SDR 96ZZZX5080

Service difficulty report · Roller Bearing · Saab SF340A

Difficulty date: September 16, 1996
Submitted: March 26, 2000
Operation: General aviation
Make and model: Saab SF340A
Engine: Ge CT79B
System (JASC): 7210 · Turbine Engine Reduction Gear
Part: Roller Bearing
Part number: 7757651
Condition: Cage Broken
Location: Gc 49 Gearcase
Part time: 13,095 hours
Component: Hamstd · 7758001
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

DISASSEMBLY OF GEARCASE REVEALED THE FORWARD INPUT ROLLER BEARING CAGE WAS BROKEN (775765-1, FIG 5, ITEM 180 OF 72-11-02 PARTS LIST). ALSO,THE INPUT PINION GEAR HAS STARTED TO HAVE SEVERE TOOTH BREAK DOWN (775755-3, FIG 3, ITEM 1558). BOTH IDLER GEARS ALSO HAD TOOTH WEAR. LT IDLER SN 1C6411358A (775753-5, FIG 8-40B). RT IDLER SN 1C64411268A (775754-5, FIG 8-75B).`

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