Service difficulty report · Thermocouple · Boeing 777222

Difficulty date
May 31, 2025
Submitted
June 3, 2025
Operation
Air carrier
Aircraft
N795UA
Make and model
Boeing 777222
Aircraft serial
26927
Aircraft time
109,030 hours, 14,419 cycles
Engine
Pwa PW4090
Part
Thermocouple
Part number
22640005
Condition
Faulty
Location
Nr 2 Engine
Stage of operation
CL
How discovered
O
Nature of condition
N
Precautionary procedure
A

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

What was found

EGT EXCEEDENCE ENG R DURING INITIAL CLIMB. RE DUCED THRUST EGT N ORML FAULT MESSAGE 75-50802 WAS SHOWN ON MAT. TCA THERMOCOUPLE PROBE TEMPERATURE RANGE CH B HAS BEEN REMOVED AND REPLACED. MESSAGE IS NO LONGER ACTIVE. POWERPLANT TEST PASSED. REF AMM 75-25-07 AND FIM 75-25 TASK 802 MAINT MSG FOUND: 77-62122 DURING CLIMB PHASE (EGT R ENG LIMIT EXCEEDED). EXCD PAGE RECORDING SHOWS MAX EGT REACHED WAS 675*C, FOR 8.2 SECS. PER FIM 71-05 TASK 833, NEED TO ACCOMPLISH THE EGT OVERTEMPERATURE INSPECTION PER AMM TASK 72-00-00-290-828-N02. ACP'D EGT OVERTEMP INSPECTION REF MM72-00-00-290-828-N02, TABLE 602, FOLLOWING ZONE A GUIDELINE, VISUAL INSP PAYING PARTICUAL ATTENTION TO EXHAUST CASE, BLADES, CONE FINDING NO DISCREPANCIES. WORKED WITH L/P 5041588. ACP'D POWER PLANT TEST 9 - POWER ASSURANCE TEST, #2 ENG AT 1.25EPR REF MM71-00-00-720-804-N00 TO CONFIRM T2.95SB OPS CHK NORMAL AND WITHIN NORMAL PARAMETERS. EGT ALSO NORMAL OPS AND PARAMETER INDICATION OKAY. NO FAULT IN MAT POST TEST 9 RUN FOR MX MSGS 75- 50802 OR 77- 62122. PICTURES OF EPCS AND PERFORMANCE PPGS INCLUDED FOR REF ALONG WITH MAT FAULT HISTORY.