# SDR CALA2025052604944

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2025
- Submitted: May 27, 2025
- Operation: Air carrier
- Aircraft: [N472UA](https://openairdocs.org/aircraft/N472UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 1435
- Aircraft time: 73,151 hours, 30,797 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32145410
- Part serial: 008237
- Condition: Faulted
- Location: Zone 200
- Part time: 773,133 hours, 730,790 cycles
- 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/CALA2025052604944

## Discrepancy

EMERGENCY LIGHT SWITCH (4WL) ON FWD OVERHEAD PANEL MALFUCTIONING. REPLACED EMERGENCY LIGHT SWITCH (4WL) REF AWM 33-51-01 PG 01. OPS CHECKED GOOD.PARTS USED:  EMERGENCY LIGHT TEST FAILED EPSU INT LOAD EMER L SEE PIC. R/R POWER SUPPLY UNIT(11WL) REF AMM 33-51-38. OPC GOOD. NO FURTHER DEFECTS NOTED.PARTS USED:  31-3350-9-9001, QTY :1 ROTABLE PARTS CHG:TT # 1559485 SN OFF 4172 PN OFF 31-3350-9-9001 IPC REFERENCE # MFG SN OFF NOT ON AC.POWER SUPPLY, P  OFF 31-3350-9-9001 8237 ON 31-3350-9-9001 1217,QTY :1

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