SDR ASAA2017122523026

Service difficulty report · Warning Message · Boeing 737890

Difficulty date: December 25, 2017
Submitted: February 12, 2018
Operation: Air carrier
Aircraft: N558AS
Make and model: Boeing 737890
Aircraft serial: 35177
Aircraft time: 43,656 hours, 12,851 cycles
System (JASC): 7720 · Engine Temperature Indicating System
Part: Warning Message
Condition: False Activation
Location: Nr 1 Engine
Stage of operation: IN
How discovered: 9
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

NR 1 ENGINE ECONOMIC FAULT 73-11371, UPPER EGT SECTORS READING HIGH. ACFT GROUNDED. PERFORMED EEC BITE IAW FIM 73-00, TASK 801. FAULT 73-11371 IS NOT ACTIVE IN RECENT FAULTS. PERFORMED FIM 73-11, TASK 801 WITH ENGINE RUNNING, T49.5 PARAMETERS ARE S1 413, S2 433, S3 417, AND S4 403. THERE IS A 30 DEG SPREAD BETWEEN SECTORS 1 - 4 AND 2 - 3. IAW FIM IT IS LESS THAN 100 DEG. MAINT MESSAGE 73-11371 IS STILL NOT ACTIVE IN RECENT FAULTS. ACFT RELEASED.