SDR AU510001501

Service difficulty report · Wire · Boeing 737800*

Difficulty date: December 12, 2005
Submitted: June 6, 2006
Operation: General aviation
Make and model: Boeing 737800*
Engine: Ge CFM56*
System (JASC): 2897 · Fuel System Wiring
Part: Wire
Condition: Damaged
Location: Fuel System
Stage of operation: DE
How discovered: O
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

NR 2 AFT FUEL PUMP LOW PRESSURE LIGHT ILLUMINATED AND CIRCUIT BREAKER TRIPPED. INVESTIGATION FOUND FUEL PUMP WIRING BADLY BURNT AT EARTH PIG TAIL FERRULE. IT APPEARS THAT WHEN THE WIRING HARNESS WAS MANUFACTURED, ONE OR ALL THREE PHASE POWER WIRES TO THE PUMP WERE CUT DURING THE CRIMP PREPARATION. WHEN THE EARTH PIG TAIL FERRULE FOR THE METAL SHEATH OVER THE TOP OF THE THREE PHASE WIRES WAS CRIMPED, IT PROVIDED A PATH TO SHORT THE THREE PHASE WIRES TO EARTH. SUSPECT MANUFACTURING ERROR.

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