SDR ASAA2023012531642

Service difficulty report · Fmc · Boeing 737890

Difficulty date: January 23, 2023
Submitted: January 25, 2023
Operation: Air carrier
Aircraft: N581AS
Make and model: Boeing 737890
Aircraft serial: 35188
Aircraft time: 55,289 hours, 16,431 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Faulted
Location: Right
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

VTK ON RT NAV DISPLAY FOLLOWED BY LOSS OF LNAV/VNAV ASSOCIATED WITH A RIGHT FMC FAILURE 2 HOURS INTO FLIGHT. FMC SUBSEQUENTLY RECOVERED ON ITS OWN BEFORE QRH CHECKLIST WAS INITIATED. GROUNDED - YES. ACCOMPLISHED B737-800 FIM TASK 34-61 TASK 804, NO FAULTS, CONFIRMATION TEST OPS NML. ACCOMPLISHED FMC SYSTEM OPERATIONAL TEST, OPS NML REF B737-800 AMM 34-61-00-710-801. NO HISTORY LAST 30 DAYS.