SDR ASAA2020101133328

Service difficulty report · Fmc · Boeing 737990ER

Difficulty date: October 11, 2020
Submitted: October 12, 2020
Operation: Air carrier
Aircraft: N402AS
Make and model: Boeing 737990ER
Aircraft serial: 41189
Aircraft time: 29,612 hours, 9,593 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
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

VTK ON CAPTAIN'S ND AND LDG ACT FLAG ON CAPTAIN'S PFD. ACCOMPLISHED FMC FAIL CHECKLIST ON P6.11.3. FMC SWITCH BACK TO NORMAL ON STEP 6. HOWEVER VTK & LDG ACT FLAGS BECAME INTERMITTENT. DECIDED TO PUT FMC SWITCH BACK TO BOTH ON RT. VTK & LDG ACT FLAGS NO LONGER DISPLAYED ON CAPTAIN'S SIDE. GROUNDED-YES. PERFORMED FMC RESET, PER B737-900 FIM 34-61 TASK 836. OPERATIONS CHECKED NORMAL.