SDR ERAA077293

Service difficulty report · Structure · Bell 412

Difficulty date
November 15, 2001
Submitted
December 3, 2001
Operation
General aviation
Aircraft
N417EH
Make and model
Bell 412
Aircraft serial
33031
Aircraft time
14,630 hours, 13,659 cycles
Engine
Pwa PT6T3B
Part
Structure
Condition
Corroded
Location
Cooler Blower
Part time
8,358 hours
Component
Cooler Blower
Component part number
209062502101
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

VANE GUIDE ASSY HAS PITTING & CORROSION. COATING ASSY HAS MECHANICAL DAMAGE ON OUTER LIP. SLIGHT CORROSION ON LOCK PLATE. SPACER FAILED DUE TO MECHANICAL DAMAGE. IMPELLAR HAS CRACKED BLADES. ACTION TAKEN: DISASSEMBLED & STRIPPED PAINT. COMPLIED WITH VISUAL & NDT INSPECTIONS. REMOVED & TREATED SLIGHT CORROSION. HAD VARIOUS PARTS PAINTED. REASSEMBLED & OVERHAULED USING NEW COATING ASSY., IMPELLAR, GUIDE VANE ASSY, NEW BEARINGS, PACKING, GASKET, AND HARDWARE AND NEW DECAL IAW 412 CR&O CHAPTER 79 & BHT-ALL-SPM.

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