# SDR CALA2026012713339

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 24, 2026
- Submitted: January 27, 2026
- Operation: Air carrier
- Aircraft: [N769UA](https://openairdocs.org/aircraft/N769UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26921
- Aircraft time: 109,709 hours, 20,059 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: ADD71701100
- Condition: Discharged
- 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/CALA2026012713339

## Discrepancy

POWER SUPPLY - BATTERY PACK CAPACITY CHECK PROCEDURE - 4,   PROXIMITY LIGHTS LT & RT AND 4 MAIN AISLE RT SIDE SEAT ROWS 33 TO 36. AND 3 MAIN AISLE LIGHTS LEFT SIDE  IN FIRST CLASS DID NOT STAY ILLUMINATED AT LEAST 15 MIN DURING TEST.  REPLACED THE BATTERY PACK FOR POWER SUPPLY M33404 & BATTERY PACK AT POWER SUPPLY M33424 IAW AMM 33-51-06. OPS CHECKED GOOD.

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