# SDR ASAA2017011919485

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2017
- Submitted: January 23, 2017
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 15,243 hours, 4,989 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Control Valve
- Part number: 1074926
- Part serial: 15313
- Condition: Failed
- Location: Bleed Air Sys
- Part time: 15,237 hours, 4,987 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017011919485

## Discrepancy

DUCT PRESS SPLIT IN CLIMB AND CRUISE 18L 42 R. GROUNDED - YES. ACCOMPLISHED NR 1 ENG BLEED AIR SYSTEM HEALTH CHECK REF T/C NG-36WC-00001. REMOVED & REPLACED NR 1 ENG PRECOOLER CTRL VALVE & NR 1 ENG BAR REF MM 36-12-02 & 36-11-03. LEAK & OPS CHECKED GOOD REF MM 36-11-00-710-801.

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