SDR 95ZZZX4096

Service difficulty report · Firewall · Bell 412

Difficulty date: July 6, 1995
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N397AL
Make and model: Bell 412
Aircraft serial: 36012
System (JASC): 5412 · Nacelle/Pylon, Bulkhead/Firewall
Part: Firewall
Part number: 212060901203
Condition: Corroded
Location: Straps
Stage of operation: IN
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

DURING REPLACEMENT OF ENGINE SERVICE DECK, FOUND THE STRAPS ON UPPER FIREWALL WHERE THE AIR MANAGEMENT SYSTEM BOLTS ON, HAD SEVERE CORROSION. CAUSED BY ALUMINUM BEING SANDWICHED BETWEEN STAINLESS STEEL. SUSPECT CAUSED DISSIMILAR METAL CORROSION.

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