- Difficulty date
- March 28, 2021
- Submitted
- April 1, 2021
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 43255
- Aircraft time
- 27,777 hours, 8,965 cycles
- Part
- Computer
- Part number
- 8221604102
- Part serial
- 41GV2G
- Condition
- Faulty
- Location
- Ee Rack, E1
- Part time
- 27,777 hours, 8,965 cycles
- Stage of operation
- NR
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NEITHER LNAV OR VNAV WOULD ENGAGE. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 22-11 TASKS 830 AND 831 ALSO FIM 34-61 TASK 801 FMC BITE. FOUND FAULT MSG 22-11360 (CONDITIONS INHIBIT BITE ENTRY FOR FCC-A) THEN ACCOMPLISHED FIM 22-11 TASK 801 DFCS BITE. FOUND FAULT MSG 22-11303 (FCC-A HAS INTERNAL FAULT). REMOVED & REPLACED FCC-A IAW B737-900 22-11-33/401. FCC OP CK NORMAL. REF TASK CARD 78222000. VERIFIED FCC A&B SOFTWARE 2270-COL-AC2-22 INSTALLED.