Service difficulty report · Probe · Boeing 777222

Difficulty date
November 5, 2012
Submitted
December 20, 2012
Operation
Air carrier
Aircraft
N774UA
Make and model
Boeing 777222
Aircraft serial
26936
Aircraft time
68,158 hours, 12,829 cycles
Engine
Pwa PW4077
Part
Probe
Condition
Faulty
Location
Tat
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

ENGINE EEC C1 L LEFT ENGINE CONTROL IS IN A TIME LIMITED DISPATCH CONDITION. ENGINE CONTROL SYSTEM IS OPERATING WITH REDUCED REDUNDANCY.STATUS MSG01- NOT ACTIVE CRUISE MODE DEPENDENT; ELECTRONIC ENGINE CONTROL (L ENG) T2 SIGNAL DOES NOT AGREE WITH TOTAL AIR TEMPERATURE SIGNALS FROM AIR DATA INERTIAL REFERENCE UNIT AND SECONDARY ATTITUDE AIR DATA REFERENCE UNIT. DB- ELECTRONIC ENGINE CONTROL (L ENG, CH B) MSG-7762081 INACTV ER MODE. REPLACED TAT PROBE MESSAGE GONE