What was found
IN CRUISE, F/O MFD DISPLAYED "VTK" MESSAGE FOR APPROXIMATELY 20 SECONDS. ANP EXCEEDED RNP AND RETURNED TO NORMAL OPERATION. ACFT GROUNDED. ACCOMPLISHED FMC BITE REF FIM, TASK 34-61-801. NO FAULTS NOTED ON LT AND RT FMC'S.
- Difficulty date
- April 12, 2015
- Submitted
- April 15, 2015
- Operation
- Air carrier
- Aircraft
- N461AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 36363
- Aircraft time
- 4,053 hours, 1,348 cycles
- System (JASC)
- 3460 · Flight Management Computing Hardware System
- Part
- Warning Message
- Condition
- False Activation
- Location
- Fmc
- Stage of operation
- CR
- 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.