SDR ASAA2015100513375

Service difficulty report · Warning Message · Boeing 737990ER

Difficulty date: October 5, 2015
Submitted: October 9, 2015
Operation: Air carrier
Aircraft: N481AS
Make and model: Boeing 737990ER
Aircraft serial: 44106
Aircraft time: 391 hours, 126 cycles
Engine: Cfmint CFM567B27E
System (JASC): 7700 · Engine Indicating System
Part: Warning Message
Condition: False Indication
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

WHILE PERFORMING AN INSPECTION, FOUND FAULT ON NR 1 ENGINE. SHORT TIME, MESSAGE 73-30311, THE START SWITCH SIGNAL AND BUS DATA DISAGREE 1ST FLIGHT LEG. ACFT GROUNDED. ACCOMPLISHED REPAIR CONFIRMATION, ELECTRONIC ENGINE CONTROL TESTS WITH NR 1 ENGINE START SWITCH IN ALL POSITIONS. ALL TESTS PASS, REF FIM 73-24/813.