SDR 97ZZZX4684

Service difficulty report · Idler Gear Nut · Saab SF340A

Difficulty date: October 24, 1997
Submitted: March 26, 2000
Operation: General aviation
Filed by: SI3R842L
Hamilton Sundstrand World Wide Repair
Make and model: Saab SF340A
Engine: Ge CT79B
System (JASC): 7210 · Turbine Engine Reduction Gear
Part: Idler Gear Nut
Part number: 7757533
Condition: Loose Torque
Location: Gc49 Gear Case
Part time: 13,407 hours
Component: Hamstd · 6044T35P10
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 GEAR CASE REVEALED THE INPUT ROLLER BEARING RACE CRACKED, PINION GEAR BEARING SURFACE SPALLED, LEFT AND RIGHT IDLER GEAR RETAINING RINGS BROKE, AND NO TORQUE ON LEFT IDLER GEAR NUT. PINION, SN IC641356. INPUT BEARING, SN 9-259. REF: OPERATOR CONTROL NR SI3R97012, 97ZZZX4682, AND 97ZZZX4683.

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