SDR ASAA2017081621652

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: August 16, 2017
Submitted: August 17, 2017
Operation: Air carrier
Aircraft: N453AS
Make and model: Boeing 737990ER
Aircraft serial: 36354
Aircraft time: 14,246 hours, 4,687 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Nr 2
Stage of operation: NR
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

NR 2 FMC INOPERATIVE. FMC CAUTION LIGHT ILLUMINATED ON AUTOPILOT ANNUNCIATOR PANEL THEN RETURNS TO NORMAL APPROXIMATELY EVERY 30 SECONDS. ACFT GROUNDED. ATTEMPTED TO RESET NR 2 FMC, NO HELP. REMOVED AND REPLACED THE NR 2 FMC. REMOVED NEW FMC AND INSTALLED THE ORIGINAL UNIT IAW AMM 34-61-02. ON INSTALLATION OF ORIGINAL UNIT NR 2 FMC OPERATES NORMALLY. ALL SOFTWARE CHECKS EFFECTIVE. ALL TESTS GOOD.