SDR ASAA2017032020207

Service difficulty report · Fmc · Boeing 737890

Difficulty date: March 20, 2017
Submitted: March 21, 2017
Operation: Air carrier
Aircraft: N577AS
Make and model: Boeing 737890
Aircraft serial: 35186
Aircraft time: 38,121 hours, 11,304 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Intermittent
Location: First Officer'S
Stage of operation: NR
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

FIRST OFFICER`S FMC FAILED. RAN THE CHECKLIST AND OPERATIONS WERE RESTORED TO NORMAL. ACFT GROUNDED. PERFORMED RIGHT FMC BITE IAW FIM 34-61 TASK 801. FOUND INTERMITTENT FAULT LOGGED; RESYNC AND FMC ALREADY SINGLEA. ACCOMPLISHED RESYNC FAIL IAW FIM 34-61 TASK 832. BOTH FMCS OPS CHECKED NORMAL. ACCOMPLISHED DFCS LRU REPLACEMENT FOR BOTH FMCS. ALL TESTS PASSED IAW FIM 22-11 TASK 801. ACCOMPLISHED BOTH FMC OPS TEST, IAW AMM 34-61-00. SYSTEM CHECKS NORMAL.