# SDR CALA2021102201942

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 20, 2021
- Submitted: October 22, 2021
- Operation: Air carrier
- Aircraft: [N436UA](https://openairdocs.org/aircraft/N436UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 638
- Aircraft time: 77,218 hours, 30,071 cycles
- System (JASC): [3300 · Lighting System](https://openairdocs.org/jasc/3300)
- Part: None
- Part number: AD321431
- Part serial: 234107
- Condition: Weak
- Location: 12wl
- Stage of operation: UK
- How discovered: O
- Nature of condition: L
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2021102201942

## Discrepancy

EMERGENCY LIGHTS FAIL TO ILLUMINATE FOR THE BATTERY PACKS AT THE BATTERY PACKS AT THE L/H AND R/H OVERWING (11WL & 12WL) WITH THE CONTROL SWITCH IN ARMED AND THE C/B''S PULLED - SUPPORT TASK - N R 9294239 (28239) GENERATED BY V061627 AT HAECO LCQ. REMOVED AND REPLACED 11WL & 12WL EPSU BATTERIES AND OP CHECKS GO OD IAW A320 AMM 33-51-38-000-002-A, 33-51-38-400-002-A AND 33-51 -00-710-001-A. ACCOMPLISHED BY V061637, INSP BY N078570.

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