SDR ASAA2019020528056

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: February 5, 2019
Submitted: February 6, 2019
Operation: Air carrier
Aircraft: N492AS
Make and model: Boeing 737990ER
Aircraft serial: 44110
Aircraft time: 12,810 hours, 4,297 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Cockpit
Stage of operation: CR
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

ENROUTE AT FL380 LEFT FMC FAILED. NO MAP DATA ON CAPT DISPLAY, NO FMC ON BOTH CDU'S, VTK DISPLAYED CAPT SIDE FMC FAIL. QRC COMPLETED. FIRST TIME AROUND RESET TO FMC-NORMAL, HOWEVER VTK RETURNED ON CAPT SIDE INDICATING LEFT FMC FAILURE. REMAIN WITH FMC BOTH ON RIGHT TO LANDING. FAULT-VTK FLAG SHOWS- CAPTAINS-34620031. GROUNDED - YES. L FMC LOGGED PGM FAULT. RESET BOTH FMC'S. OP CK NORMAL. REF FIM 34-61 TASK 836 & 801.