SDR 97ZZZX4769

Service difficulty report · Gearbox · Saab SF340A

Difficulty date: October 31, 1997
Submitted: March 26, 2000
Operation: Air carrier
Make and model: Saab SF340A
Engine: Ge CT79B
System (JASC): 7210 · Turbine Engine Reduction Gear
Part: Gearbox
Part number: 5074T51G10
Condition: Damaged
Location: Idler Gear
Part time: 11,623 hours
Component: GC49
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

PRIOR TO DISASSEMBLY, PROP SHAFT NOTED FROZEN IN PLACE. DISASSEMBLY REVEALED AFT HOUSING, OIL PUMP, RIGHT IDLER GEAR, RIGHT IDLER GEAR RETAINING NUT ALL HAVE EXTENSIVE DAMAGE. RIGHT IDLER GEAR NUT BACKED OFF ASSEMBLED POSITION. GEARBOX IS DEEMED SCRAP.

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