SDR ASAA2018080225628

Service difficulty report · Sensor · Boeing 737890

Difficulty date: July 29, 2018
Submitted: September 11, 2018
Operation: Air carrier
Aircraft: N557AS
Make and model: Boeing 737890
Aircraft serial: 35176
Aircraft time: 46,398 hours, 13,678 cycles
System (JASC): 7722 · Engine EGT/TIT Indicating System
Part: Sensor
Condition: Dirty
Location: Nr 2 Engine
Stage of operation: IN
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

FOUND NR 2 ENGINE ECONOMIC FAULT 77-20862 "THE BOTTOM LEFT EGT SIGNAL IS OUT OF RANGE". GROUNDED - YES. ACCOMPLISHED EGT CLEANING PROCEDURES, BEFORE CLEAN TEMP READS: S1- 126.50, S2- 70.25, S3, S4- 123.12. AFTER CLEAN, TEMPERATURES READS: S1- 65.37, S2- 35.00, S3- 34.62, S4- 63.00, REF AMM 77-21-00-140-801. EEC BITE TEST OPS NML REF AMM 73-21-00-700-804-F00.