SDR ASAA2020122633756

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: December 26, 2020
Submitted: December 29, 2020
Operation: Air carrier
Aircraft: N469AS
Make and model: Boeing 737990ER
Aircraft serial: 41702
Aircraft time: 24,308 hours, 7,835 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Nr 2
Stage of operation: AP
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

ON DOWNWIND OGG, GOT F/O FMC FAIL WITH VTK, CAPTAINS FMC NORMAL, SELF RESTORED ON FINAL NOTICED COURSE ON RNAV WAS OFFSET LEFT THEN RECEIVED FMC VERIFY POSITION-FMC-FMC F/O GUIDANCE WOULD HAVE TAKEN US NORTH OF COURSE INTO TERRAIN, ILS MONITORING BACK TO CORRECT PATH. GROUNDED-YES. RESET CB FMC 2, IAW B737-900 FIM 34-01 TASK 836, ALL INDICATIONS NORMAL. OK FOR SERVICE.