Service difficulty report · Circuit Breaker · Boeing 747422

Difficulty date
April 27, 2011
Submitted
May 12, 2011
Operation
Air carrier
Aircraft
N120UA
Make and model
Boeing 747422
Aircraft serial
29166
Aircraft time
49,715 hours, 5,893 cycles
Engine
Pwa PW4056
Part
Circuit Breaker
Part number
BACC18AC15
Condition
Tripped
Location
Galley Chiller
Stage of operation
NR
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

CHILLER C-51-AFT GALLEY POPPED AFTER 3+32. SUPPLEMENTAL DATA UPDATE RESET CB ON GROUND, CIRCUIT BREAKER POPPED AGAIN AFTER 1.5 HOURS. C51 CIRCUIT BREAKER PULLED AND LOCKED OUT. "TEST IS A TEST CHILLER" WE DID RPL THE RELAY & FOUND IT'S CONTACTS BURNT. BEFORE REPLACING CHILLER, REF SERV TIP 25-31-20-901,PLEASE RPL CB PCN 560-3858 & PERFORM ANOTHER OPS CK, REPLACED C-51 CB. OPS CHECKED NORMAL.