SDR ASAA2014120809899

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: December 8, 2014
Submitted: December 10, 2014
Operation: Air carrier
Aircraft: N585AS
Make and model: Boeing 737890
Aircraft serial: 35683
Aircraft time: 27,856 hours, 8,409 cycles
Engine: Cfmint CFM567B27B3
System (JASC): 7330 · Engine Fuel Indicating System
Part: Warning Light
Condition: False Activation
Location: Nr 1 Engine
Part time: 4,520 hours, 1,317 cycles
Stage of operation: TX
How discovered: O
Nature of condition: N
Precautionary procedure: D

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

What was found

NR 1 FILTER BYPASS LIGHT ON AFTER TAXI FOR TAKE OFF, WENT OUT 30 SECONDS LATER. ACFT GROUNDED. PERFORMED FIM TASK 73-05, TASK 801, STEP E. FILTER BYPASS STATE SHOWS "NOT CLOGGED" WITH MESSAGE 73-31071. PERFORMED FIM 73-05, TASK 801, STEP H. NO CONTAMINATION FOUND ON FILTER. PERFORMED FIM 73-31, TASK 802, NO DEFECTS FOUND. REPLACED THE FUEL FILTER DIFFERENTIAL SWITCH AS A PRECAUTION IAW AMM 73-21-06-400-801-F00.