SDR ERAA097094

Service difficulty report · Rotor Head · Bell 412

Difficulty date
July 22, 2004
Submitted
September 7, 2004
Operation
Air carrier
Aircraft
N164EH
Make and model
Bell 412
Aircraft serial
33004
Aircraft time
15,375 hours
Part
Rotor Head
Part number
212011701121
Part serial
HB370
Condition
Out Of Balance
Location
Tail Rotor
Part time
3,203 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

UNABLE TO BALANCE HIGH FREQ, TRUNNION HAS PLAY. PITCH HORN BUSHINGS MISSING, NO PLAY IN YOKE BRHS, TRUNNION FEELS GOOD, NO DETECTABLE PLAY. TRUNNION SPLINES ARE WEAR STEPPED. SCRAPPED TRUNNION. DISASSEMBLED T/R ASSY, REPAIRED T/R BLADE A-10206, INSTALLED NEW TRUNNION ASSY, THRUST PLUGS, TRUNNION BEARINGS AND SEALS. REASSEMBLED T/R HUB, COMPLIED WITH TB-412-95-134. REASSEMBLED T/R ASSY AND MARVEL BALANCED, TORQUED AND SAFTIED IAW 412 CR&O, COMPLIED WITH TB 412-95-134.

More about the Bell 412