SDR ERAA093702

Service difficulty report · Transmission · Bell 412

Difficulty date
January 13, 2004
Submitted
March 29, 2004
Operation
Air carrier
Make and model
Bell 412
Part
Transmission
Part number
412040002103
Part serial
ANG00089
Condition
Making Metal
Location
Main Rotor
Part time
14,992 hours
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

TRANSMISSION MAKING METAL. LOCK MISSING FROM BEARING RETENTION NUT ON ACCY AND T/R DRIVE QUILL. CLIP WAS THE CAUSE OF METAL. PIECES OF FAME SPRAY FROM PREVIOUS CASE REPAIR ALSO IN OIL FILTER BUT WAS NOT CAUSE FOR CHIP LIGHT. UPPER SUN GEAR AND SPIDER GEAR SENT TO BELL TO EVALUATE PREMATURE WEAR ON GEAR TEETH.. ACTION TAKEN: REMOVED TOP CASE, UPPER AND LOWER PLANETARYS, SUMP CASE, ACCY AND T/R DRIVE QUILL, ROTOR BRAKE QUILL AND NR 2 HYD QUILL. REPAIRED ACCY AND T/R DRIVE QUILL, UPPER AND LOWER PLANETARIES, NR 1 HYD QUILL AND ARE ASSEMBLED IAW MFG 412-CR&O CH 63. COMPLIED WITH AD 94-18-09 AND ASB 412-93-72 N/A BY P/N. .

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