SDR ASAA2016112918886

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: November 29, 2016
Submitted: December 1, 2016
Operation: Air carrier
Aircraft: N472AS
Make and model: Boeing 737990ER
Aircraft serial: 60580
Aircraft time: 6,661 hours, 2,140 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Right
Stage of operation: CR
How discovered: 9
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

ENROUTE FL320 MACH .80 RIGHT FMC FAILED. RIGHT VTK ON F/O MAP APPEARED. LNAV-VNAV DISENGAGED, A/P WENT TO CWS ROLL, ALTITUDE HOLD. AFTER 20 SECONDS THE RIGHT FMC RESTORED ITSELF, LNAV-VNAV FUNCTION NORMAL. GROUNDED - YES. PERFORMED FMCS BITE PER B737-900 FIM 34-661 TASK 801. CURRENTLY NO SENSOR FAULTS. LEFT FMC SHOWED INFLIGHT FAULT FOR RIGHT FMC AS INTERMITTENT, MESSAGE " FMC-R DATE RATE I." PERFORMED B737-900 FIM 34-61-TASK 807, BOTH FMC PASSED. CHECKS GOOD FOR SERVICE.