# SDR ASAA2026092868982

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 28, 2026
- Submitted: October 1, 2026
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44106
- Aircraft time: 40,597 hours, 12,626 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: ADD71701100
- 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/ASAA2026092868982

## Discrepancy

WHILE PERFORMING T/C 78233001 EMERGENCY BATTERY PACK CAPACITY FUNCTIONAL CHECK, M1673 AFT GALLEY LEFT OVHD BATTERY PACK FAILED. GROUNDED - YES. REMOVED AND REPLACED M1673 BATTERY PACK REF. AMM 33-51-06.OPS. CK. GOOD, OK FOR SVC.

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