What was found
ON CLIMBOUT - FMC MESSAGE "VNAV INVALID PERF". FMC HAD DROPPED THE COST INDEX OUT. AFTER REINSTALLING COST INDEX NORMAL OPS. GROUNDED - YES. PERFORMED FIM 34-61 TASK 807 AFTER RESET BOTH FMC'S CAME UP NORMAL.
- Difficulty date
- January 5, 2019
- Submitted
- January 8, 2019
- Operation
- Air carrier
- Aircraft
- N597AS
- Make and model
- Boeing 737890
- Aircraft serial
- 35689
- Aircraft time
- 40,885 hours, 12,459 cycles
- System (JASC)
- 3460 · Flight Management Computing Hardware System
- Part
- Unknown
- Condition
- Malfunctioned
- Location
- Cockpit
- Stage of operation
- CL
- How discovered
- O
- Nature of condition
- N
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.