SDR ASAA2018042024331

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: April 20, 2018
Submitted: April 23, 2018
Operation: Air carrier
Aircraft: N442AS
Make and model: Boeing 737990ER
Aircraft serial: 43293
Aircraft time: 17,532 hours, 5,825 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Location: First Officer'S
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

FIRST OFFICER`S FMC SHOWS MAP. ACFT GROUNDED. ACCOMPLISHED FMCS BITE OF BOTH LEFT AND RIGHT SENSORS, PAGE LOGGED MISMATCH FOR BOTH RIGHT AND LEFT FMC IAW FIM 34-61, TASK 801. ACCOMPLISHED PERFORMANCE FACTORS ADJUSTMENT IAW AMM 34-61-00 ,SET DRAG FACTORS TO -1.2, FIRST OFFICER'S MAP FLAG, VSPEED AND LDG ALT FLAGS NO LONGER DISPLAYED. ACCOMPLISHED FMCS BITE, FMCS BOTH OK UNDER SENSORS PAGE. ALL GROUND TESTS PASSED.