SDR ASAA2019032428747

Service difficulty report · Warning System · Boeing 737990ER

Difficulty date: March 24, 2019
Submitted: March 25, 2019
Operation: Air carrier
Aircraft: N462AS
Make and model: Boeing 737990ER
Aircraft serial: 36362
Aircraft time: 19,456 hours, 6,430 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: CR
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

DURING CRUISE, MCDU NR 2 SCREEN BLANKED, THEN MCDU "CALL, FAIL, MSG, OFST, EXEC "LIGHTS ILLUMINATED. AFTER APPROXIMATELY ONE MINUTE, MCDU NR 2 RESUMED NORMAL OPS. DURING EVENT, "FMC RST" LIGHT AND ND "MAP FLAG" & "VTK FLAG" DID NOT ILLUMINATE. "SINGLE FMC OPS" WAS NOT ANNOUNCED. NO FMC INFO WAS LOST. GROUNDED - YES. FOUND MCDU NR 2 OPERATING NORMALLY ACCOMPLISHED FIM 34-61 TASK 801, CDU-R-B, INFLT FAULT FLIGHT 1. INTERMITTENT FAULT, OK FOR SERVICE.