SDR ERAA097513

Service difficulty report · Blade · Bell 412

Difficulty date: January 25, 2004
Submitted: October 4, 2004
Operation: Air carrier
Aircraft: N169EH
Make and model: Bell 412
Aircraft serial: 33064
Aircraft time: 12,280 hours
System (JASC): 6410 · Tail Rotor Blades
Part: Blade
Condition: Eroded
Location: T/R Head
Part time: 1,392 hours
Component: Rotor Head
Component part number: 212011701121
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

TIP RIVETS ERRODED. TIP RIVETS OF BLADE A11405 ERRODED, TRUNNION ROUGH, FEATHER BEARINGS HAVE PLAY ONE BEARING GALLED, T/R BLADES. REMOVED TO F.O.M. REMOVED YOKE BEARINGS, TRUNNION ASSY, NDT INSPECTED, BEARING BORES, INSTALLED NEW BEARINGS, STAKED IAW 412 CR&O, INSTALLED SERVICEABLE TRUNNION, BEARINGS AND SEALS. ASSEMBLED HUB ASSY IAW TB 412-95-134 & 412 CR&O INSTALLED SERVICEABLE T/R BLADES, MARVEL BALANCED, TORQUED AND SAFETIED IAW 412 CR&O., COMPLIED WITH ASB412-00-106 PART B T.B. 412-95-134.

More about the Bell 412