SDR ASAA201805214702

Service difficulty report · Fmc · Boeing 737890

Difficulty date: May 20, 2018
Submitted: May 21, 2018
Operation: Air carrier
Aircraft: N562AS
Make and model: Boeing 737890
Aircraft serial: 35091
Aircraft time: 44,910 hours, 13,362 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Nr 1
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

POSSIBLE BRIEF FMC FAILURE NR 1 FMC ALERT LIGHT 2, VTK CAPT SIDE 3 BOTH CDU MENU PAGE DISPLAYED W/O FMC FOUR LOSS OF LNAV VNAV DISINGAGED WITHIN 25 SEC BOTH FMCS RESTORED. ACFT GROUNDED. PERFORMED FMCS BITE TEST IAW FIM 34-61, TASK 801, NO CURRENT FAULTS FOUND. FOUND FAULT LFMC PRES POS LAT RATE INFLIGHT FAULTS. PERFORMED FIM 34-61 TASK 824, NO CURRENT FAULTS. PERFORMED ADIRS BITE IAW FIM 34-21 TASK 801 NO FAULTS LEGS 01-09. FOUND TO BE AN INTERMITTENT FAULT.