What was found
ALTITUDE WINDOW LOCKS UP. UNABLE TO CHANGE SELECTED WINDOW. ACFT GROUNDED. REBOOTED AIRCRAFT POWER. PERFORMED FIM 22-11, TASK 803 FOR MODE CONTROL FAILURE. ROTATED SELECTOR THAT IS ABLE TO CHANGE SELECTED WINDOW. OPS NORMAL.
- Difficulty date
- June 22, 2017
- Submitted
- June 23, 2017
- Operation
- Air carrier
- Aircraft
- N407AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41731
- Aircraft time
- 18,188 hours, 5,862 cycles
- System (JASC)
- 2210 · Autopilot System
- Part
- Indicator
- Condition
- Locked
- Location
- Altitude
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.