Service difficulty report · Fan · Boeing 747422

Difficulty date
December 27, 2004
Submitted
January 4, 2005
Operation
Air carrier
Aircraft
N198UA
Make and model
Boeing 747422
Aircraft serial
28716
Aircraft time
29,724 hours, 3,714 cycles
Engine
Pwa PW4056
Part
Fan
Condition
Failed
Location
Lt Recirc
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

ELEC UTIL BUS R EICAS ADVISORY MESSAGE DISPLAYED. UTILITY BUSS 3 (OR 4) OR GALLEY BUSS 3 (OR 4) DOES NOT HAVE ELECTRICAL POWER ON IT. AIRPLANE IS NOT IN LOAD SHED CONDITION. THE LOWER LEFT RECIRCULATION FAN BEARINGS FAILED. THE FAN WAS REPLACED AND THE AIRCRAFT HAS NO FURTHER PROBLEMS.