Service difficulty report · Thermocouple · Boeing 737724

Difficulty date
August 4, 2022
Submitted
August 5, 2022
Operation
Air carrier
Aircraft
N15710
Make and model
Boeing 737724
Aircraft serial
28780
Aircraft time
74,333 hours, 26,832 cycles
Engine
Cfmint CFM567B242
Part
Thermocouple
Part number
TC29603
Part serial
9169
Condition
Warning Light
Location
Eng #1
Stage of operation
CL
How discovered
O
Nature of condition
M
Precautionary procedure
A

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

What was found

HIGH EGT 903 NO 1 REPEAT WRITEUP ADDED PICS, NO FAULTS NOTED. REMOVED AND REPLACED CORE ENGINE HARNESS CJ9 REF AMM PARTIALLY INSTALLED CJ10 HARNESS. REQUIRES ROUTING AND CHECK FOR FINISHED INSTALLATION OF CJ10 HARNESS AND SAFETY WIRED 73-21-06-400-803.REQURES INSTALLATION TEST TO BE COMPLETED REF ALL SECURING BRACKETS. INSTALLED EGT PROBE T49.5 S4 THERMOCOUPLE REF AMM 73-21-06-000-803-F00. INSTALLATION TEST AMM 73-21-00-700-802. THERMOCOUPLE. THERMOCOUPLE REQUIRES SAFETYING NEEDS TO BE COMPLETED REF AMM 73-21-00-700-802. COMPLETED E1 EGT PROBE/HARNESS INSTALLATION TEST, GOOD REF. AMM RESULTS WITH ENG. DESK (MARK), AND HE CONCURS. VERIFIED NO 73-21-00-700-802. COMPLETED E1 EEC BITE, & E1 POWER ASSURANCE EXCEEDANCES DISPLAYED. ACFT. OK FOR SERVICE. TEST, BOTH GOOD REF. AMM 71-00-00-813-F00. VERIFIED E1 T495S1 -S4 EGT VALUES MATCH. (SEE PIC ATTACHED) DISCUSSED ENG. RUN PARTS TAG FOR THERMOCOUPLE T495S4 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1889771 SN OFF 1699 IPC REFERENCE # 77-21-01 PROBE, THERMOCO OFF 29-7721-9-9001 9169 ON 29-7721-9-9001 3413