SDR ASAA2015041211318

Service difficulty report · Warning Message · Boeing 737990ER

Difficulty date: April 12, 2015
Submitted: April 15, 2015
Operation: Air carrier
Aircraft: N459AS
Make and model: Boeing 737990ER
Aircraft serial: 36352
Aircraft time: 4,181 hours, 1,385 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Message
Condition: False Activation
Stage of operation: DE
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

AT 22K FT DESCENDING CAPT SIDE MFD LOST NAV DATA AND SIGNALED VTK LOST DATA ON BOTH CDUS FO MFD HAD FULL NAV DATA LNAV/VNAV DISENGAGED RESTORED NORMAL OPERATION IN 30-40 SECONDS. ACFT GROUNDED. DFCS BITE LOGGED FMC CHANNEL A FAULT FMC BITE IAW 34-61 TASK 801. SHOWS NO CURRENT FAULTS. NO CURRENT DISCREPANCIES NOTED.