# SDR ASAA2022041638044

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 16, 2022
- Submitted: April 18, 2022
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737
- Aircraft serial: 44106
- Aircraft time: 24,883 hours, 7,846 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Unknown
- Part number: 32144464
- Part serial: 17109
- Condition: Stuck
- Location: #1 Engine
- Part time: 24,882 hours, 7,845 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022041638044

## Discrepancy

SPLIT IN DUCT PRESSURE BETWEEN LEFT AND RIGHT DUCT. GROUNDED - YES. CREW OBSERVATION LH 5PSI AND RH 20PSI. IAW B737-900 FIM 36-10 TASK 804 FOUND HIGH STAGE VALVE VALVE STICKING. REMOVED AND REPLACED ENG #1 HIGH STAGE VALVE IAW B737-900 AMM 36-11-06. NO LEAK CHECKS NOTED DURING LEAK CHECK. RAN BOTH ENGINES, NO DUCT SPLIT NOTED.

---
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.