Service difficulty report · Control Unit · Boeing 777222

Difficulty date
January 12, 2009
Submitted
January 14, 2009
Operation
Air carrier
Aircraft
N781UA
Make and model
Boeing 777222
Aircraft serial
26945
Aircraft time
50,269 hours, 9,234 cycles
Engine
Pwa PW4077
Part
Control Unit
Part number
4885501002
Condition
Malfunctioned
Location
Cockpit
Stage of operation
IN
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

SPOILERS FAULTING. ALSO HAS PFC CHANNEL STATUS, DC PWR AND ADIRU FAULTS. INSTALL NEW PFC AND ACE CNTR, NO HELP. REINSTALLED ORIGINAL PARTS AND ACCOMPLISH PFC AND ACE TEST, ALL PASS. ACCOMPLISH CATIII CHECK ALSO PASS, NO STATUS MSG. ALSO NO FAULT ON MAT. MAINT MSG 27-13002 HAS OCCURRED EN ROUTE MULTIPLE TIMES. REPLACED CENTER ACE AND OP CHECKS GOOD.