SDR ASAA2013082095854

Service difficulty report · Fmc · Boeing 737890

Difficulty date: August 20, 2013
Submitted: August 22, 2013
Operation: Air carrier
Aircraft: N566AS
Make and model: Boeing 737890
Aircraft serial: 35182
Aircraft time: 25,489 hours, 7,742 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Stage of operation: TX
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

FMC ENTER IRS POSITION MESSAGE, DISPLAYED WITH IRS POSITION ENTERED. ALIGN LIGHTS CONTINUE TO FLASH. ACFT GROUNDED. ENTERED IRS POSITION IN FMC CDU SCRATCH PAD, BUT SYS WASN`T ACCEPTING IT AND GAVE ERROR MESSAGE, CYCLED BREAKERS FOR FMCS 1 & 2 AND SYSTEM WORKED NORMALLY, AMM REF 34-61-00, GROUND FUNCTIONAL TEST GOOD, NO HISTORY LAST 30 DAYS.