SDR AALA202004069014

Service difficulty report · Fmc · Boeing 737823

Difficulty date: April 3, 2020
Submitted: April 6, 2020
Operation: Air carrier
Aircraft: N946AN
Make and model: Boeing 737823
Aircraft serial: 30600
Aircraft time: 59,079 hours, 24,390 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Faulty
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

AIRCRAFT WAS GROUNDED: DUAL FMC FAILURE-CRUISE SEGMENT DUAL VTK AND MAP FAILURE FLAGS. SYSTEM AUTO RESET SIX TIMES. FINAL TIME, RESET DUMPED ALL FLIGHTS DATA. MANUAL INPUT DATA BOTH FMC FUNCTION NORMAL ON APPROACH. ACCOMPLISHED FIM 34-61-00-810-801 RH FMC HAD MULTIPGM FAULTS. REPLACED RH FMC WIH COM5117 IAW IPC 34-61-02-02 ITEM 005M QUALIFIED I/W DATA ALL CKD GOOD REF AMM 34-61-02. ALSO SEE FIM 34-61-00-810-807 FMC HARDWARE - SOFTWARE FAULTS.