# SDR ASAA2026080667833

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2026
- Submitted: August 7, 2026
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 67,226 hours, 20,577 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: D71702001
- Condition: No Test
- Location: Zone 200
- 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/ASAA2026080667833

## Discrepancy

WHILE PERFORMING T/C 78233001 FOUND BATTERY PACK M1673 FAILING CAPACITANCE CHECK. GROUNDED - YES. REMOVED AND REPLACED BATTERY PACK M1673 REF SMM 33-51-14-103 AND AMM 33-51-06. INSTALL TEST OK.

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