# SDR CALA2025021902368

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 16, 2025
- Submitted: February 19, 2025
- Operation: Air carrier
- Aircraft: [N452UA](https://openairdocs.org/aircraft/N452UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 955
- Aircraft time: 78,770 hours, 33,379 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Butterfly Valve
- Part number: V2T152D
- Part serial: 3299
- Condition: Faulted
- Location: Zone 100
- Part time: 78,757 hours, 33,374 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025021902368

## Discrepancy

VENT EXTRACT FAULT, WITH CORRELATED FAULT ISOL V 24HQ WHEN EXTRACT PB/SW SET TO OVRD. REMOVED AND REPLACED AVIONICS VENTILATION SKIN EXCHANGER ISOLATION VALVE. REF AMM TASK 21-26-55-000-002-A. OPS CHECK PERFORMED IN REF TO AMM TASK 21-26-00-710-001-A. OPS CHECK GOOD.PARTS USED:  31-2125-9-9002,QTY :1  40-0597-3-0410,QTY :1  1419649,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1419649 SN OFF 3299 IPC REFERENCE # AIPC 21-26-01-17 VALVE, PNEU BUT OFF 31-2125-9-9002 3299 ON 31-2125-9-9002 5509

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.