What was found
WHILE PERFORMING EMERGENCY LIGHTING SYSTEM TEST TASK CARD. FOUND 4R EMR LIGTHS INOP. NEED TO R&R WCU BATTERY @ 4R. GROUNDED - YES. REMOVED AND REPLACED 4R WBU PER AMM 33-51-07. OPS CHECK GOOD. OK FOR SVC.
- Difficulty date
- November 19, 2025
- Submitted
- November 20, 2025
- Operation
- Air carrier
- Aircraft
- N781HA
- Make and model
- Boeing 7879
- Aircraft serial
- 66429
- Aircraft time
- 6,300 hours, 1,160 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- 100260201
- Part serial
- ST23039780
- Condition
- Inoperative
- Location
- Wells Unit
- Part time
- 6,294 hours, 1,159 cycles
- 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.