# SDR ASAA2026010763648

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 2026
- Submitted: January 9, 2026
- Operation: Air carrier
- Aircraft: [N273AK](https://openairdocs.org/aircraft/N273AK), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 61554
- Aircraft time: 29,652 hours, 9,591 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: ADD71701100
- Condition: Intermittent
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2026010763648

## Discrepancy

FORWARD THREE INTERIOR EMERGENCY LIGHTS LOCATED AIRCRAFT LEFT TURN ON AND OFF INTERMITTENTLY IN FLIGHT. LIGHTS REMAINED ON EVEN WITH THE EMERGENCY LIGHT SWITCH IN THE OFF POSITION. GROUNDED - YES. REMOVED & REPLACED M2335 POWER SUPPLY/BATTERY PACK. OPS CK GOOD. REF WDM 33-51-11-4, WDM 33-51-12-5, AMM 33-51-06.

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