SDR NOCA00111

Service difficulty report · Relay · Boeing 75728A

Difficulty date: January 5, 2011
Submitted: January 5, 2011
Operation: Air carrier
Aircraft: N755NA
Make and model: Boeing 75728A
Aircraft serial: 30043
System (JASC): 2121 · Air Distribution Fan
Part: Relay
Part number: KDAE4F
Condition: Failed
Location: Equipment Fan
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AIR TURNBACK , EICAS MESSAGE EQUIPMENT OVERHEAT DISPLAYED OVHT LGT ILLUMINATED, EICAS MESSAGE EQUIPMENT CLG FAN DISPLAYED. OVERHEAT LIGHT REMAINED ILLUMINATED WHEN ALTERNATE WAS SELECTED. EQUIPMENT CLG FLOW DISPLAYED ON GROUND. CIRCUIT BREAKERS FOR AFT EQUIP EXHAUST FANS 1 AND 2 OPEN AT P37 AND P70 PANELS. EXHAUST FAN 1 FAILED TO RESET. EXHAUST FAN 2 RESET SUCCESSFULLY OPS CHECKED NORMAL. REPLACED EQUIPMENT VENT FAN RELAY K346 PER WDM 21-58-21, OPS CHECKED GOOD.

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