SDR AALA202001189009

Service difficulty report · Fmc · Boeing 737823

Difficulty date: January 16, 2020
Submitted: January 18, 2020
Operation: Air carrier
Aircraft: N858NN
Make and model: Boeing 737823
Aircraft serial: 30904
Aircraft time: 29,105 hours, 11,871 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Defective
Location: Cockpit
Stage of operation: TO
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

AIRCRAFT WAS NOT GROUNDED: TAKEOFF WITH NR 1 F/D ENGAGED - AUTOTHROTTLE SET T/O POWER WHEN TO/GA WAS SELECTED BUT TO/GA WOULD NOT DESELECT WHEN VNAV LVL CHG OR VERT SPEED MODES WERE SELECTED CONTINUED. CA FMA PITCH MODE BLANKED AND A YELLOW PITCH MODE WARNING DISPLAYED ON CAPT NAVDISP. NR 1 F/DSELECTED OFF NR 2 F/D A/P SELECTED ON AND ALL PITCH FUNCTIONS WORKED. REPLACED REPLACED RIGHT FLIGHT MANAGEMENT COMPUTER PER AMM 34-61-02. FLIGHT MANAGEMENT COMPUTER OPERATIONAL TEST NORMAL.