SDR ASAA2022122041204

Service difficulty report · Fmc · Boeing 737890

Difficulty date: December 20, 2022
Submitted: December 22, 2022
Operation: Air carrier
Aircraft: N536AS
Make and model: Boeing 737890
Aircraft serial: 35203
Aircraft time: 40,036 hours, 11,414 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Faulted
Location: Left
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

BETWEEN HALLI AND HELOP WAYPOINTS AT FL350, BOTH FMCS FAILED. VTK DISPLAYED ON BOTH ND SCREENS, BOTH MAPS DISAPPEARED FROM BOTH MCDU MENU PAGES. EVERYTHING RETURNED TO NORMAL OPERATIONS AFTER APPROX. 2 MINUTES. GROUNDED - YES. BITE CHECKED BOTH FMC'S IAW FIM 34-61 TASK 801. LT FAULTED PGM FAULT. RT - NO FAULTS. PERFORMED FIM 34-61 TASK 836, NO DEFECTS NOTED. 1 EA C/B ON P6-1 OPENED, RESET FOR FIM PROCEDURE.