SDR ASAA2015093013289

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: September 30, 2015
Submitted: October 2, 2015
Operation: Air carrier
Aircraft: N423AS
Make and model: Boeing 737990ER
Aircraft serial: 35206
Aircraft time: 9,672 hours, 3,099 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Nr 1
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

APPROXIMATELY 2 HOURS AFTER DEPARTURE, HAD "VTK" FOLLOWER BY "MAP" FLAGS ON CAPTS NAV DISPLAY AS WELL AS NO FMC DATA ON BOTH CDU. COMPLETED QRH CHECKLIST. UNABLE TO RESTORE DUAL FMC OPERATIONS. CONTINUED WITH FMC SWITCH ON "BOTH ON R". ACFT GROUNDED. MOVED FMC SWITCH TO NORMAL, VERIFIED "VTK & MAP". ACCOMPLISHED FIM 34-61, TASK 807, CYCLED FMC COMPUTER 1 C/B, FMC RESTORED TO NORMAL. NO HISTORY FOR LT FMC 30 DAYS, FMC GROUND TEST NORMAL.