SDR 20000511SH040

Service difficulty report · Planetary Gear · Skrsky S64F

Difficulty date: April 24, 2000
Submitted: May 11, 2000
Operation: General aviation
Aircraft: N158AC
Make and model: Skrsky S64F
Aircraft serial: 64081
Aircraft time: 9,278 hours
System (JASC): 6320 · Main Rotor Gearbox
Part: Planetary Gear
Part number: 643520411102
Part serial: 1477
Condition: Fractured
Location: Main Gearbox
Component: Main Gearbox · Skrsky
Component part number: 643520500048
Stage of operation: IN
How discovered: V
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

1ST STAGE PLANETARY PINION GEAR, PN 6435-20411-102, SN 1477, HAVING AN UNKNOWN TT, FAILED IN MAIN GEARBOX, PN 6435-20500-048, SN A6-161. INSP REVEALED TWO-THIRDS OF A 1ST STAGE PLANETARY PINION GEAR TOOTH FRACTURED CAUSING REPLACMENT OF THE FOLLOWING ITEMS DUE TO SECONDARY DAMAGE: 18 EACH 2ND STAGE PLANETARY PINION GEARS, PN 6435-20057-012, RING GEAR, PN 6435-20165-012, 1ST STAGE SUN GEAR, PN 6435-20412-102, 2ND STAGE SUN GEAR, PN 6435-20414-101, AND 6 EACH 1ST STAGE PLANETARY PINION GEARS REPLACED. (X)