SDR ASAA2014120309850

Service difficulty report · Warning Message · Boeing 737990ER

Difficulty date: December 3, 2014
Submitted: December 6, 2014
Operation: Air carrier
Aircraft: N407AS
Make and model: Boeing 737990ER
Aircraft serial: 41731
Aircraft time: 7,942 hours, 2,504 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning Message
Condition: False Activation
Location: Fmc
Stage of operation: NR
How discovered: 9
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

VTK DISPLAY ON CAPTAIN`S ND, BOTH FMC`S FAILED. SYSTEM RESET AUTOMATICALLY BY ITSELF. ACFT GROUNDED. ACCOMPLISHED FIM 34-61-00-810-801, FMCS BITE SENSORS, OK, INFLIGHT FAULTS LEG NR 1 FMC-R HAS FAULTS, CDS-R, CP-L 272 DISCR RATE AND (FMC-L) PRES POS LAT RATE. FMC-L HAS INFLIGHT FAULT LEG 1: (CDS-R) CP-L 272 DISCR RATE. INFLIGHT FAULTS ARE INTERMITTENT. ACCOMPLISHED FIM 34-61 TASK 824 AND FIM 34-61 TASK 827. NO CURRENT FAULTS, BITE TESTS NORMAL. NO RESENT HISTORY. ALSO ACCOMPLISHED FIM 34-61 TASK 807, NO FAULTS.