# SDR ASAA2023031042307

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 10, 2023
- Submitted: March 13, 2023
- Operation: Air carrier
- Aircraft: [N403AS](https://openairdocs.org/aircraft/N403AS), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 41730
- Aircraft time: 38,421 hours, 12,264 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702001
- Condition: Failed
- Location: Mid Cabin
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023031042307

## Discrepancy

REF TC 78233001 - R AFT OVERWING ESCAPE LT, & AISLE LTS L1507, L1513, & L1517 FAIL CAPACITY CHECK - EMERGENCY BATTERY. GROUNDED - YES. REPLACED EMERGENCY EXIT POWER SUPPLY M1671 WITH SERVICEABLE UNIT OPS CHECKS OK. REF B737-900 AMM 33-51-06-960-806.

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