SDR ERAA097514

Service difficulty report · Oil Cooler · Bell 412

Difficulty date: August 24, 2004
Submitted: October 4, 2004
Operation: Air carrier
Aircraft: N421EH
Make and model: Bell 412
Aircraft serial: 33067
Aircraft time: 14,752 hours
System (JASC): 6520 · Tail Rotor Gearbox
Part: Oil Cooler
Part number: 209062501005
Part serial: 81J261
Condition: Damaged
Location: T/R Gearbox
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

OIL COOLER CORE LEAKING EXCESSIVE OIL. UNIT EXHIBITED EXCESSIVE CORE DAMAGE, DIRTY CORE, DAMAGED FINE, EXCESSIVE CARBON AND DIRT AND WORN SEALS. A MATRIX CORE WAS INSTALLED, CLEANED, FLUSHED, OVERHAULED, WORN SEALS REPLACED, TESTED AND INSPECTED IAW DAR-8500.

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