# SDR ASAA2021112136669

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 21, 2021
- Submitted: November 24, 2021
- Operation: Air carrier
- Aircraft: [N448AS](https://openairdocs.org/aircraft/N448AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36356
- Aircraft time: 19,633 hours, 6,251 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: ADD71701100
- Condition: Inoperative
- Location: Aft Cabin
- 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/ASAA2021112136669

## Discrepancy

BOTH AFT (L2 AND R2) EMERGENCY BATTERIES TEST BAD. GROUNDED - YES. REMOVED AND REPLACED LEFT AND RIGHT AFT BATTERY PACKS AND POWER SUPPLIES, S/N 414761 & S/N 412851. OPS CK GOOD IAW B737-900 AMM 33-57-06-960-805 STEPS 4.E(1-3(E))(4-6), F(4) AND AMM 33-51-06-960-806 STEP 5.E(1-3(E)), (4-5), F(4).

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