# SDR CALA2024070500145

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2024
- Submitted: July 5, 2024
- Operation: Air carrier
- Aircraft: [N478UA](https://openairdocs.org/aircraft/N478UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 1533
- Aircraft time: 65,281 hours, 28,327 cycles
- System (JASC): [7500 · Engine Bleed Air System](https://openairdocs.org/jasc/7500)
- Part: Thermostat
- Part number: 341E030000
- Part serial: 02325
- Condition: Intermittent
- Location: Nr 2 Engine
- Part time: 722,569 hours, 709,981 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2024070500145

## Discrepancy

AIR ENG2 BLEED ABNORM PR PFR AND BMC 2 BITE SHOWING: PRESS REG-V 4001HA2 OR SOL 10HA2 OR SENSE LINE. T/S REF TSM 36-11-00-810-810-A. PERFORMED LEAK CHECK ON THE #2 ENG PRV BRAIDED SENSE LINE AND RIGID LINES. NO LEAKS NOTED. PERFORMED HEALTH CHECK ON PRV 4001HA2. HEALTH CHECK FAILED.   BENCH CHECKED NEW PRV. NEW VALVE OPENS AT 8 PSI.  REMOVED AND REPLACED ENGINE #2 BLEED PRV REF AMM 36-11-52,   PERFORMED #2 ENG POWER RUN, FOUND PRV CLOSES A FEW SECONDS AFTER ENG BLEED TRANSITIONS FROM HP CLOSED TO IP APPRX 60% N1. DUPLICATED THREE TIMES. R&R PRV CONTROL SOLENOID REF AMM 36-11-55-400-001-A. PERFORMED POWER RUN AGAIN. HP/PRV VALVES OPERATE NORMAL WITH NORMAL PRESSURES.

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