SDR ASAA2013121696898

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: December 16, 2013
Submitted: January 9, 2014
Operation: Air carrier
Aircraft: N409AS
Make and model: Boeing 737990ER
Aircraft serial: 41733
Aircraft time: 3,346 hours, 1,072 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Part number: 1762000101
Part serial: 007225
Condition: Failed
Location: Nr 1
Part time: 3,621 hours, 1,158 cycles
Stage of operation: NR
How discovered: O
Nature of condition: N
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING FLIGHT, CART VTK FOLLOWED BY MAP ILLUMINATED. FOLLOWED QRH FOR LT FMC FAIL, CONTINUED ON SINGLE FMC OPS. ACFT GROUNDED. CYCLED FMC NR 1 CIRCUIT BREAKERS. OPS CHECKED NORMAL REF FIM 34-61, TASK 836 & 801. NO FAULTS LOGGED, GROUND VERIFICATION GOOD. REPLACED FMC NR 1. OPS TEST PASSED. SOFTWARE CROSSLOADED. IAW AMM 34-61-02-400-801.