# SDR ASAA2023042242992

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 22, 2023
- Submitted: April 25, 2023
- Operation: Air carrier
- Aircraft: [N453AS](https://openairdocs.org/aircraft/N453AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36354
- Aircraft time: 34,713 hours, 10,922 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702001
- Condition: Inoperative
- Location: Main Cabin
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023042242992

## Discrepancy

EMERGENCY LIGHT SYSTEM OPERATIONAL CHECK FAILED FOR ALL LIGHTS ASSOCIATED WITH BATTERY PACKS M1676 & M1672. GROUNDED - YES. REMOVED AND REPLACED SERVICEABLE EMERGENCY POWER SUPPLY S/N 112118 AT M1676 AND S/N 112185 AT M1672 IAW B737-NG AMM 33-51-06-960-806 PERFORMED EMERGENCY LIGHT OPERATIONAL CHECK. OPS-CHECK GOOD. IAW B737-NG AMM 33-51-00-720-801.

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