# SDR ASAA2017030220016

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 2, 2017
- Submitted: March 6, 2017
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 32,892 hours, 9,904 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 32144464
- Part serial: 10904
- Condition: Failed
- Location: Nr 1 Engine
- Part time: 22,899 hours, 9,170 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017030220016

## Discrepancy

LEFT BLEED TRIP OFF ILLUMINATED. QRH ACCOMPLISHED. RESET SUCCESSFUL AT FL380.  ACFT GROUNDED. ACCOMPLISHED WRENCH CHECK OF ALL VALVES. NO FAULTS FOUND, IAW AMM 36-00-00.  REMOVED AND REPLACED PRE-COOLER CONTROL VALVE IAW AMM 36-12-12.  REMOVED AND REPLACED HIGH STAGE VALVE. LEAK CHECKED GOOD IAW AMM 36-11-06.  ALSO REMOVED AND REPLACED PRE-COOLER CONTROL VALVE SENSOR. LEAK CHECKED GOOD IAW AMM 36-12-03.  RAN ENGINE AT IDLE, ALL LEAK AND OPS CHECKED GOOD. FOUND LOOSE SENSE LINE ON THE HIGH PRESSURE REGULATOR. SECURED SENSE LINE. LEAK AND OPS GOOD.

---
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.