# SDR UIEA2022042200370

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 29, 2022
- Submitted: May 3, 2022
- Operation: Air carrier
- Aircraft: [N473MC](https://openairdocs.org/aircraft/N473MC), registered now
- Make and model: Boeing 747
- Aircraft serial: 27174
- Aircraft time: 111,020 hours, 19,942 cycles
- System (JASC): [3300 · Lighting System](https://openairdocs.org/jasc/3300)
- Part: None
- Part number: BPS73
- Part serial: 39938
- Condition: None
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2022042200370

## Discrepancy

U/D EXIT SIGN R/H FOUND WENT OFF IN LESS THAN 15 MINS, M5057 PWR SUPPLY BATTERY NEED REPLACEMENT.(<P>EMERGENCY BATTERY PWR SUPPLY ASSY M5057 REPLACED AND INSTALLATION TEST CARRIED OUT RESULT NORMAL IAW AMM 33-51-04 REV 104, 15MAR2022.</P>)

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