SDR ASAA2018040524158

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: April 5, 2018
Submitted: April 9, 2018
Operation: Air carrier
Aircraft: N440AS
Make and model: Boeing 737990ER
Aircraft serial: 41705
Aircraft time: 17,749 hours, 5,915 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Right
Stage of operation: NR
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

F/O FLIGHT DIRECTOR DISENGAGED, WOULD NOT REENGAGE. ACFT GROUNDED. FLIGHT FAULT REVIEW, FCC B FAULTS FMC DATA INV, F/D BIAS OUT OF VIEW. FCC A, NO FAULTS. RT FMC BITE, IN FLT FLTS IAW FIM 34-61/801. FAULTS RT FMC. PERFORMED FIM 34-61/ 836 - BOTH FMC OPS NORMAL. ETOPS GND VERIFICATION SUCCESSFUL. DFCS LRU REPLACED, TESTED FMC, GOOD IAW AMM 22-11-00.