SDR ASAA2016060917004

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: June 9, 2016
Submitted: June 13, 2016
Operation: Air carrier
Aircraft: N428AS
Make and model: Boeing 737990ER
Aircraft serial: 36353
Aircraft time: 986 hours, 315 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Left
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

LEFT FMC FAILED DURING CRUISE. LT FMC RESTORED TO NORMAL USING QRH PROCEDURES. ACFT GROUNDED. PERFORMED LT FMC BITE FAULT REVIEW TO VERIFY FMC FAULT OCCURRENCE. LT FMC FAULT SHOWS 1 SINGLE TIME ON INFLIGHT HISTORY. PERFORMED LT FMC OPS TEST AND SYS TEST, REF AMM 34-61-00. NO FAULTS FOUND. ALL SOFTWARE IS CORRECT AND EFFECTIVE. ETOPS SIGNIFICANT SYS GROUND VERIFICATION SUCCESSFUL.