SDR ASAA2018042124344

Service difficulty report · Connector · Boeing 737990ER

Difficulty date: April 21, 2018
Submitted: April 23, 2018
Operation: Air carrier
Aircraft: N419AS
Make and model: Boeing 737990ER
Aircraft serial: 41734
Aircraft time: 20,364 hours, 6,702 cycles
Engine: Cfmint CFM567B27E
System (JASC): 7797 · Engine Indicating System Wiring
Part: Connector
Condition: Dirty
Location: Nr 1 Engine
Stage of operation: NR
How discovered: 9
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

GE DIAGNOSTICS REPORTED THE NR 1 ENGINE TREND DATA SHOWS A SHIFT IN EGT HOT DAY MARGIN, ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECT PRI: 2 ETOPS SIGNIFICANT SYSTEM. ACFT GROUNDED. ACCOMPLISHED EGT INDICATION SYSTEM TROUBLESHOOTING AND CONNECTOR CLEANING IAW AMM 77-21-00-140-801. NO DEFECT NOTED. INITIAL S1-S4 TEMPERATURES ARE S1-61.95, S2-35.79, S3-30.61, S4-79.00. RESULTING, CLEANED S1-S4 TEMPERATURES ARE S1-36.84, S2-21.70, S3-16.67, S4-40.16. RESULTS ARE WITHIN LIMITS.