# SDR ASAA2019102863114

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 26, 2019
- Submitted: October 28, 2019
- Operation: Air carrier
- Aircraft: [N596AS](https://openairdocs.org/aircraft/N596AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35688
- Aircraft time: 43,691 hours, 13,198 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator
- Part number: 1074847
- Part serial: 17393
- Condition: Intermittent
- Location: Nr 1 Engine
- Part time: 11,429 hours, 3,592 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019102863114

## Discrepancy

ON GROUND @ IDLE LEFT DUCT PRESSURE IS LOW AND FLUCTUATING BETWEEN 7 & 12 PSI. GROUNDED - YES. REMOVED & REPLACED HIGH STAGE VALVE PER B737-800 AMM 36-11-06 PB 401. OPS AND LEAK CHECK GOOD. REMOVED AND REPLACED HIGH STAGE REGULATOR PER AMM 36-11-07 PB 401. OPS & LEAK CHECK GOOD, NO FAULTS FOUND.

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