# SDR ASAA2026021064254

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2026
- Submitted: February 11, 2026
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 37,980 hours, 11,721 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/ASAA2026021064254

## Discrepancy

WHILE WORKING T/C 78233001, FOUND FLIGHT DECK DOME EMERGENCY LIGHT INOPERATIVE,  EMERGENCY EXIT SIGN AT 16ABC WITH INOPERATIVE LAMPS, & M1672 EMERGENCY EXIT LIGHT BATTERY PACK FAILED A CAPACITANCE CHECK. GROUNDED - YES.  REPLACED SECONDARY LAMP OF DOME LIGHT ASSY IAW AMM 33-14-00-960-804.  OP CHECKS NORMAL. REPLACED 16ABC EXIT SIGN LAMPS & REPLACED THE SIGN COVER WITH NEW IAW AMM 33-51-01.  M1672 BATTERY PACK WAS REMOVED & REPLACED IAW AMM 33-51-06-960-805.

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