Service difficulty report · Wire · Boeing 777222

Difficulty date
January 26, 2004
Submitted
February 3, 2004
Operation
Air carrier
Aircraft
N771UA
Make and model
Boeing 777222
Aircraft serial
26932
Aircraft time
32,322 hours, 6,537 cycles
Engine
Pwa PW4077
Part
Wire
Condition
Overheated
Location
Galley Oven
Stage of operation
CR
How discovered
O
Nature of condition
M
Precautionary procedure
H

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

What was found

FIRST CLASS GALLEY OVENS AND HOT PLATES INOPERATIVE. WIRES BECAME OVERHEATED AT CONNECTION POINT OF C1 LUG ON 15 AMP CIRCUIT BREAKER C003 SUPPLYING POWER TO A FIRST CLASS OVEN. THIS CIRCUIT BREAKER IS ALSO IN A PARALLEL CIRCUIT THAT SUPPLIES POWER TO ADDITIONAL OVENS AND WARMING PLATES DOWNSTREAM. CIRCUIT BREAKER APPEARS TO HAVE BEEN WORKING CORRECTLY AND VISUAL ANALYSIS OF BURNED WIRES INDICATE INCORRECT CRIMPING ON BOTH WIRE LUGS ATTACHED TO THE CIRCUIT BREAKER. ADDITIONALLY, WIRE LUGS MAY NOT HAVE BEEN TIGHT ON THE C1 TERMINAL ON THE CIRCUIT BREAKER. CIRCUIT BREAKER AND WIRES WERE REPLACED.