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SDR ASAA2019092530823

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Service difficulty report · Warning System · Boeing 737890

FAA SDR system

Difficulty date
September 25, 2019
Submitted
September 26, 2019
Operation
Air carrier
Aircraft
N584AS
Make and model
Boeing 737890
Aircraft serial
35682
Aircraft time
45,903 hours, 13,597 cycles
System (JASC)
2425 · AC Indicating System
Part
Warning System
Condition
False Activation
Location
Cockpit
Stage of operation
DE
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

TRANSFER BUS OFF LIGHT #2 BEGAN TO FLICKER JUST AFTER TOP OF DESCENT TO JFK, IT WAS ALWAYS A VERY QUICK FLASH AND CAUSED THE MASTER CAUTION TO FLASH AS WELL. NO OTHER SYSTEMS SEEMED TO BE AFFECTED AND THE BUS SEEMED TO REMAINED POWERED CONTINUOUSLY. THE INTERMITTENT FLICKERING CONTINUED UNTIL ABOUT 17,000' MSC OR ABOUT 10 MINUTES. GROUNDED - YES. ACCOMPLISHED FIM TASK 24-21 TASK 819. FLICKERING WAS AN INTERMITTENT FAULT. ALL CHECKS NORMAL. NO DEFECTS NOTED AT THIS TIME. CREW RAN BOTH ENGS AND GROUND VERIFICATION WAS SUCCESSFUL. REF FIM 24-21-TASK 819.