SDR UALA2012123107461

Service difficulty report · Wire Harness · Boeing 777222

Difficulty date: December 29, 2012
Submitted: February 1, 2013
Operation: Air carrier
Aircraft: N786UA
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
Part: Wire Harness
Condition: Faulty
Location: Egt
Stage of operation: TX
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

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