SDR ASAA2012092792953

Service difficulty report · Wire Harness · Boeing 737890

Difficulty date: September 1, 2012
Submitted: September 27, 2012
Operation: Air carrier
Aircraft: N596AS
Make and model: Boeing 737890
Aircraft serial: 35688
Aircraft time: 16,864 hours, 5,374 cycles
Engine: Cfmint CFM567B273
System (JASC): 7797 · Engine Indicating System Wiring
Part: Wire Harness
Part number: 3250254010
Condition: Damaged
Location: Nr 1 Engine
Stage of operation: IN
How discovered: 9
Nature of condition: O
Precautionary procedure: K

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

What was found

NR 1 ENGINE TREND DATA CONTINUES TO SHOW ERRORS INDICATIVE OF EGT INDICATION SYS ANOMALIES. FOUND AT PINS 3 & 4 A RESISTANCE READING OF 7 OHMS ONE WAY, LEADS SWAPPED, OPEN READING OTHER WAY. READ OUT S1 AND S4 PROBES REF. SAME MM, WITH IN TOL. REF. MM 73-21-06, R & R CORE ENGINE HARNESS.