SDR ERAA079872

Service difficulty report · Gear · Bell 412

Difficulty date: May 7, 2002
Submitted: June 17, 2002
Operation: Air carrier
Aircraft: N417EH
Make and model: Bell 412
Aircraft serial: 33031
Aircraft time: 14,630 hours, 15,334 cycles
System (JASC): 6320 · Main Rotor Gearbox
Part: Gear
Condition: Failed
Location: Gearbox
Part time: 11,867 hours
Component: Gearbox
Component part number: 412040002103
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

INSPECTION OF PLANETARY SYSTEM FOR BREAKDOWN. UPPER PLANETARY - BROKEN CAGE, SAME GEAR HAS SCORED ROLLER SET. REMOVED TOP CASE, REMOVED UPPER & LOWER PLANETARY AND ASSOCIATED GEARS. DISASSEMBLED, INSPECTED FOR BREAKDOWN, DETAILS ON BLUE FORMS ; FOUND NO BREAKDOWN OTHER THAN NORMAL WEAR, REASSEMBLED AND REINSTALLED PLANETARY'S AND GEAR IN TRANSMISSION. ALL WORK IAW BHT-412 CR&O63/

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