SDR ASAA2015082512908

Service difficulty report · Fmc · Boeing 737890

Difficulty date: August 25, 2015
Submitted: August 27, 2015
Operation: Air carrier
Aircraft: N560AS
Make and model: Boeing 737890
Aircraft serial: 35179
Aircraft time: 34,689 hours, 10,533 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
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

MID PACIFIC -TEMPORARY LOSS OF ALL FMC DATA WITH VTK FLAGS LT IRS SHOWING 3 MILE DEVIATION AND INCREASING. ACFT GROUNDED. LT FMC SHOWS AN INFLIGHT FAULT THAT CAUSED MULTIPLE FLAGS. REBOOTED LT FMC COMPUTER & BITE TEST OK REF FIM TASK 34-61, TASK 801, VERIFIED NO FAULTS CURRENT OR INFLIGHT ON IRS. NO HISTORY 90 DAYS. LT FMC HAD A TEMP LOCK-UP. OPS OK. ETOPS GROUND VERIFICATION COMPLETE.