SDR AALA202011189019

Service difficulty report · Fmc · Boeing 777223

Difficulty date: November 16, 2020
Submitted: November 18, 2020
Operation: Air carrier
Aircraft: N766AN
Make and model: Boeing 777223
Aircraft serial: 32880
Aircraft time: 68,242 hours, 8,390 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Faulted
Location: Cockpit
Stage of operation: CR
How discovered: O
Nature of condition: O
Precautionary procedure: A

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

What was found

AIRCRAFT WAS NOT GROUNDED. FLIGHT DIVERTED TO TUL FOR SUSPECTED FUEL LEAK OR INDICATION PROBLEM. RT ENGINE BURNED 1000 LBS MORE FUEL, NO IMBALANCE, FMC SHOWED LOSING 8000 LBS MINIMUM AT DBQ CHECKPOINT. ACCOMPLISHED WALKAROUND GVI WITH NO FUEL LEAKS NOTED. MANUALLY MEASURED FUEL TANKS, IAW AMM 12-11-05, ALL INDICATIONS MATCH. ACCOMPLISHED FMC OPERATIONAL TEST, IAW AMM 34-61-00, OPERATIONS CHECK GOOD.