SDR ASAA2017112422707

Service difficulty report · Connector · Boeing 737890

Difficulty date: November 24, 2017
Submitted: December 26, 2017
Operation: Air carrier
Aircraft: N506AS
Make and model: Boeing 737890
Aircraft serial: 35690
Aircraft time: 35,945 hours, 11,030 cycles
Engine: Cfmint CFM567B27
System (JASC): 7797 · Engine Indicating System Wiring
Part: Connector
Part number: 00
Condition: Dirty
Location: Egt
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

WHILE PERFORMING T/C 78273000, FOUND THE NR 1 ENGINE ECONOMIC FAULT. MESSAGE 77-20861, THE BOTTOM LEFT EGT SIGNAL T495S3 IS OUT OF RANGE. ACFT GROUNDED. FAULT 77-20861 LOGGED ON LEGS 0 THRU 10. FOUND S3 VALUE READS HIGH. ACCOMPLISHED EGT CONNECTOR CLEANING IAW AMM 77-21-00, EEC TEST PASSED, ALL 4 S1 THRU S4 VALUE WITHIN LIMITS. PRE CLEANING: S1-34.62, S2-15.44, S3-874.36, S4-49.94. POST CLEANING: S1-25.92, S2-9.91, S3-11.86, S4-27.84. OPS TEST PASSED.