Service difficulty report · Thermocouple · Boeing 737924ER

Difficulty date
August 24, 2025
Submitted
August 27, 2025
Operation
Air carrier
Aircraft
N68453
Make and model
Boeing 737924ER
Aircraft serial
41742
Aircraft time
41,340 hours, 15,199 cycles
Engine
Cfmint CFM567B26E
Part
Thermocouple
Part number
TC29603
Part serial
YC5804688
Condition
Faulted
Location
Nr 2 Engine
Part time
32,546 hours, 11,901 cycles
Stage of operation
TO
How discovered
O
Nature of condition
J
Precautionary procedure
C

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

What was found

RIGHT ENGINE EXCEEDED EGT 964. R & R NR 2 ENG LEFT UPPER EGT PROBE (T49.5S4) IAW AMM 77-21-04-401. PROBE TESTS OK, R & R LT LOWER NR 3 EGT PROBE ON NR 2 ENG IAW AMM 77-21-04-401 PROBE OPS CHECKS GOOD. R & R T495S4 AND CLEANED ALL T495 SENSRS, J9, J10, CJ9 & CJ10 ELEC CONNECTORS IAW AMM 77-21-04-401 RAN ENGS FOR 5 MINS. S1 & S4 WITHIN 25 DEGREE IAW FIM 77-21 TASK 804 S2 & S3 64 DEGREE C SPLIT. R & R T495S3 REF AMM 77-21-04-401 RAN ENGS FOR 5 MINS, NO HELP STILL 65-70 DEGREE SPLIT BETWEEN S2-S3. R & R CJ10 HARNSS IAW AMM 73-21-06-400-803, RAN ENGS FOR 5 MINS. NO HELP, T495S2 & T495S3 STILL SHOW ABOUT A 70 DEGREE SPLIT. R & R ENG 2 J10 HARNESS IAW AMM 73-21-06. OPS CHECK REMAINS REQUIRED.