# SDR DALA2015042902961

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2015
- Submitted: April 29, 2015
- Operation: Air carrier
- Aircraft: [N661US](https://openairdocs.org/aircraft/N661US), registered now
- Make and model: Boeing 747451
- Aircraft serial: 23719
- Aircraft time: 106,353 hours, 13,951 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Condition: Inoperative
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2015042902961

## Discrepancy

EMERGENCY LIGHT IN UPPER DECK FWD HALF SECTION INOPERATIVE.  REPLACED EMERGENCY LIGHT BATTERY PACK WITH KNOWN GOOD UNIT  FOR POS UNIT M335, M312 AND M7052. REF AMM 33-50.  7047826.

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