# SDR CALA2026070917637

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 7, 2026
- Submitted: July 9, 2026
- Operation: Air carrier
- Aircraft: [N23708](https://openairdocs.org/aircraft/N23708), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28769
- Aircraft time: 85,305 hours, 31,582 cycles
- Engine: Cfmint CFM567B242
- System (JASC): [7720 · Engine Temperature Indicating System](https://openairdocs.org/jasc/7720)
- Part: Thermocouple
- Part number: TC29603
- Part serial: 4483
- Condition: Faulted
- Location: Nr 1 Engine
- Part time: 1 hours, 1 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026070917637

## Discrepancy

ENGINE 1 EGT IN AMBER RANGE DURING CLIMBOUT AT THRUST REDUCTION & ACCELERATION ALTITUDE 1112 FT. DURING TAXI OUT FLUCTUATING ABOUT 20 SPORADICALLY AT LOW POWER SETTINGS. IAW FIM 77-21 TASK 803, BITE TEST FOUND MAINT FAULT 77-20861 FOR BOTTOM LT EGT SIGNAL (T495S3) IS OUT OF RANGE. S3 BOTTOM LT PROBE PREVIOUSLY REPLACED. GIVEN PREVIOUS HISTORY & EGC ON L/P 9520053, R & R CJ10 HARNESS. IAW  AMM 73-21-06.  ENGINE EXPERIENCING AN INTERMITTENT EGT INDICATION ISSUE. R & R ENGINE 1 CJ10 HARNESS. IAW AMM 73-21-06.  VERIFIED INSTALL OF NR 1 ENG EEC J10 WIRE HARNESS IAW 73-21-06-400-802-F00. STILL FADEC SYSTEM TEST, TASK 73-21-00-700-802-F00. R & R J10 HARNESS IAW AMM 73-21-06-400-802-F00, R & R THERMOCOUPLE IAW AMM

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.