SDR ERAA076681

Service difficulty report · Transmission · Bell 412

Difficulty date: October 11, 2001
Submitted: November 12, 2001
Operation: General aviation
Aircraft: N164EH
Make and model: Bell 412
Aircraft serial: 33004
Aircraft time: 13,551 hours
System (JASC): 6320 · Main Rotor Gearbox
Part: Transmission
Part number: 412040002103
Part serial: ANG00107
Condition: Corroded
Location: Main Rotor
Part time: 8,992 hours
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

TRANSMISSION DUE 3100 HOUR INSPECTION. LOWER SPIDER BREAKING, UPPER SUN GEAR BREAKING, MAIN INPUT LINER, MAIN CASE HAS EXCESSIVE CORROSION DAMAGE, MAIN INPUT QUILL ALIGNMENT MARKS BEARING PINION OFF, RING GEAR OUTER SURFACE RUSTING, MAIN INPUT BEARING SLEEVE RUSTED. ACTION TAKEN: SENT TO ERA REPAIR STATION ALASKA FOR INSPECTION. THIS INFORMATION FOR FAA SDR.

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