SDR ASAA2019050429242

Service difficulty report · Unknown · Boeing 737990ER

Difficulty date: May 4, 2019
Submitted: May 6, 2019
Operation: Air carrier
Aircraft: N471AS
Make and model: Boeing 737990ER
Aircraft serial: 41703
Aircraft time: 18,341 hours, 5,988 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Unknown
Condition: Malfunctioned
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

APPROX 40 MIN INTO FLIGHT, L FMC FAILED, BUT CAME BACK ONLINE BEFORE QRH WAS RUN. APPROX 30 MIN LATER, BOTH FMCS FAILED COMPLETELY. RAN QRH AND PROCEEDED W/O FMC'S. THEY APPEARED TO COME BACK ONLINE BUT WE DID NOT USE FMC'S. GROUNDED - YES. NR 1 AND 2 FMC COMPUTER OPS CHECK GOOD. REF AMM 34-61 TASK 836. NO HISTORY 30 DAYS.