# SDR UALA2012123107461

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2012
- Submitted: February 1, 2013
- Operation: Air carrier
- Aircraft: [N786UA](https://openairdocs.org/aircraft/N786UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26938
- Aircraft time: 69,312 hours, 9,956 cycles
- Engine: Pwa PW40903
- System (JASC): [7797 · Engine Indicating System Wiring](https://openairdocs.org/jasc/7797)
- Part: Wire Harness
- Condition: Faulty
- Location: Egt
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012123107461

## Discrepancy

NR 1 ENGINE EGT INDICATION INOP.  ON TAXI EGT INDICATING 724.  AHM DOWN LOADED MM MSG 77-51101 (EGT PROBES (L ENG C H. B) SIGNAL IS OUT OF RANGE) REF FIM 77-21 TASK 802 FOR TROUBLESHOOTING, WORK WITH EM3740 (NR 1 ENG EGT IND TROUBLESHOOTING) SEE EM3740-1, HARNESS W634 EGT RAKE, RAN ENG SYS CHECKS GOOD.  REPLACED EGT RAKE HARNESS W635, RAN ENG, EGT CKS GOOD. PROBE RESISTANCE, CKS GOOD

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