SDR ASAA2018091226102

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: September 11, 2018
Submitted: September 12, 2018
Operation: Air carrier
Aircraft: N423AS
Make and model: Boeing 737990ER
Aircraft serial: 35206
Aircraft time: 21,566 hours, 7,126 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: Cockpit
Stage of operation: LD
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

AFTER LANDING & DURING APU START, YELLOW "FMC P/RST" LIGHT ILLUMINATED. YELLOW "VTK" FLAG APPEARED ON CAPT MAP DISPLAY AND BOTH FMC CDU'S REVERTED TO "MENU" PAGE W/NO "FMC" SELECTION AVAILABLE AT 1L OF MENU PAGE. PROBLEM CLEARED ON ITS OWN MOMENTARILY & REOCCURRED MULTIPLE TIMES TO INCLUDE AFTER BOTH ENGINES SHUTDOWN AT GATE. GROUNDED - YES. RESET BOTH FMC & OPS NML PER FIM 34-61 TASK 836. ETOPS SIGNIFICANT SYSTEM, GROUND VERIFICATION SUCCESSFUL.