SDR ERAA082721

Service difficulty report · Mast · Bell 412

Difficulty date
November 20, 2002
Submitted
December 30, 2002
Operation
Air carrier
Aircraft
N164EH
Make and model
Bell 412
Aircraft serial
33004
Aircraft time
14,103 hours
Part
Mast
Part number
412040366105
Part serial
A17
Condition
Leaking
Location
Main Rotor
Part time
11,790 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

MAST SEAL IS LEAKING. MAST SPLINES CORRODED, BEARING PITTED, NUT CORRODED, PLATE PITTED, RACE NUT GOUGED, LINGER SCORED & WORN. DISASSEMBLED FOR SEAL CHANGE & FOUND CORROSION. COMPLETELY DISASSEMBLED AND FOUND MAST UNECONOMICAL TO REPAIR DUE TO SO MANY UNSERVICEABLE ITEMS. PERFORMED VISUAL & NDT INSPECTIONS ON LOCK PLATE & CHECKED SLINGER AND FOUND NO DEFECTS. SCRAPPED MAST ASSEMBLY.

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