SDR ASAA2015121214205

Service difficulty report · Fmc · Boeing 737890

Difficulty date: December 12, 2015
Submitted: December 16, 2015
Operation: Air carrier
Aircraft: N532AS
Make and model: Boeing 737890
Aircraft serial: 36346
Aircraft time: 21,422 hours, 6,477 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Multiple Fail
Stage of operation: CL
How discovered: O
Nature of condition: G, J
Precautionary procedure: O

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

What was found

ONCE ON CLIMBOUT AND TWICE ON DESCENT CAPTAINS F/D PITCH BAR DISAPPEARED, VNAV LOST AND WENT TO CWS PITCH. VNAV RESTORED EACH TIME. ACFT GROUNDED. DFCS FFR SHOWED A FAULT OF FMC DATA INVALID 22-11822. PERFORMED FIM 22-11, TASK 811. NO CURRENT STATUS FAULTS BITE NR 10 AND F/D BITE 12 GOOD. FMC INFLT FAULTS SHOW NO FAULTS ON EITHER FMC'S. IAW FIM, INTERMITTENT FAULT.