SDR ASAA2019052629524

Service difficulty report · Not Reported · Boeing 737990ER

Difficulty date: May 26, 2019
Submitted: July 5, 2019
Operation: Air carrier
Aircraft: N474AS
Make and model: Boeing 737990ER
Aircraft serial: 40715
Aircraft time: 15,513 hours, 5,079 cycles
System (JASC): 7722 · Engine EGT/TIT Indicating System
Part: Not Reported
Condition: Dirty
Location: Egt System
Stage of operation: IN
How discovered: O
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 (CDU FAULTS) FOUND FAULT 77-20862, BOTTOM LEFT EGT SIGNAL IS OUT OF RANGE ON #2 ENGINE. GROUNDED - YES. ACCOMPLISHED EGT SYSTEM CLEANING FOR NR 2 ENG REF AMM 77-21-00-140-801. ETOPS GROUND VERIFICATION TEST SUCCESSFUL REF EEC TEST AMM 73-21-00-700-804. PRE CLEANED EGT TEMPS FROM THE INPUT MONITORING CDU PAGE WERE S1-162, S2-123, S3-118, S4-154. POST CLEANED TEMPS WERE S1-38, S2-18, S3-20, S4-41. PLT CLEARED.