What was found
ALL FOUR UPPER DECK EMERGENCY EXIT SIGNS IN CENTER CEILING MOMENTARILY ILLUMINATED AND THEN EXSTINGUISH DURING EMERGENCY LIGHT TEST. REPLACED THE BATTERY PACK IAW MM 33-51-04. EMERGENCY LIGHTS CHECKED GOOD.
- Difficulty date
- February 18, 2017
- Submitted
- February 20, 2017
- Operation
- Air carrier
- Aircraft
- N174UA
- Make and model
- Boeing 747422
- Aircraft serial
- 24381
- Aircraft time
- 104,303 hours, 11,419 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery Pack
- Condition
- Faulted
- 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.