SDR 2008FA0000898

Service difficulty report · Frame · Lear 35A

Difficulty date: December 22, 2008
Submitted: December 22, 2008
Operation: General aviation
Aircraft: N244LJ
Make and model: Lear 35A
Aircraft serial: 35A244
Aircraft time: 4,361 hours, 3,834 cycles
Engine: Garrtt TFE731*
System (JASC): 5311 · Fuselage Main, Frame
Part: Frame
Condition: Corroded
Location: Fuselage
Part time: 4,361 hours, 3,834 cycles
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

WHILE INSPECTING THE LT AFT FUEL TANK STRUCTURE, DUE TO LIGHTENING DAMAGE EVENT, FOUND THE FOAM INSULATION WATER SOAKED, AND CAUSING SERIOUS CORROSION IN OUTER FLANGE OF AFT PRESSURE BULKHEAD AND SURROUNDING STRUCTURE. THE HOLE IN THE LT OUTER PRESSURE BULKHEAD FLANGE, WHERE HOT AIR PIPE PENETRATES FLANGE HAD SEVERE INTERGRANULAR CORROSION OCCURRING , AND AREA WAS VERY WET.

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