What was found
AIRCRAFT WAS NOT GROUNDED: DURING EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK, WELLS CONTROL UNIT LH1 NOT COMMUNICATING WITH WELS BATTERY UNITS. REPLACED WELS CONTROL UNIT LH1 PER AMM 33-51-07.
- Difficulty date
- July 19, 2021
- Submitted
- July 20, 2021
- Operation
- Air carrier
- Aircraft
- N800AN
- Make and model
- Boeing 7878
- Aircraft serial
- 40618
- Aircraft time
- 23,245 hours, 3,649 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Control Unit
- Condition
- No Test
- Location
- Emergency Lights
- Stage of operation
- IN
- How discovered
- C
- Nature of condition
- L
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.