SDR ASAA2019051329315

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: May 13, 2019
Submitted: May 14, 2019
Operation: Air carrier
Aircraft: N467AS
Make and model: Boeing 737990ER
Aircraft serial: 36362
Aircraft time: 19,504 hours, 6,496 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
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

DURING CRUISE LEFT FMC FAILED. PERFORMED QRH PROCEDURE AND OPS RETURNED TO NORMAL. LATER IN FLIGHT LEFT FMC FAILED FOR A SECOND TIME. PERFORMED QRH PROCEDURE. POSITION REF PAGE SHOWS LEFT FMC RETURNED TO NORMAL OPERATIONS. TO PREVENT LOSS ON ARRIVAL FMC SELECT SWITCH WILL REMAIN IN RIGHT ONLY. GROUNDED - YES. LEFT FMC LOGGED PGM FAULT. RESET LEFT FMC. OP CK NORMAL. REF AMM 34-61-00-710-801 & FIM 34-61 TASK 837.