What was found
DURING CRUISE AT 360 NEAR MISSULA MT FMC'S BLANKED A/P REVERTED TO CWS P/R MAGENTA LINE ON ND BLANKED A/P DID NOT DISENGAGE. ENTIRE EPISODE LASTED APPROX 2 MIN. GROUNDED-YES. LT FMC 4 INFLIGHT FAULTS, SYSTEM OPERATIONS OK.
- Difficulty date
- October 31, 2020
- Submitted
- November 3, 2020
- Operation
- Air carrier
- Aircraft
- N491AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44109
- Aircraft time
- 18,913 hours, 6,050 cycles
- System (JASC)
- 3460 · Flight Management Computing Hardware System
- Part
- Fmc
- Condition
- Malfunctioned
- Stage of operation
- CR
- How discovered
- O
- Nature of condition
- P
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.