What was found
AIRCRAFT WAS GROUNDED: DURING ACCOMPLISHMENT OF WORK CARD 78T21033001, FAULT CODE 33-12131 SHOWS. REMOVED AND REPLACED WELS CONTROL UNIT NUMBER 31 PER AMM 33-51-07. WELS CONTROL UNIT 31 GROUND TEST NORMAL. NO FAULTS FOUND.
- Difficulty date
- April 12, 2022
- Submitted
- April 14, 2022
- Operation
- Air carrier
- Aircraft
- N836AA
- Make and model
- Boeing 737
- Aircraft serial
- 40654
- Aircraft time
- 14,805 hours, 1,790 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Control Unit
- Condition
- None
- Location
- Zone 200 - Fuse
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.