# SDR ASAA2017111422581

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 14, 2017
- Submitted: November 16, 2017
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 35,658 hours, 10,723 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Line
- Part number: 332A235014
- Condition: Broken
- Location: Nr 1 Engine
- Stage of operation: CR
- 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/ASAA2017111422581

## Discrepancy

LEFT PACK DUCT PRESSURE 5 PSI. RIGHT PACK DUCT PRESSURE  45 PSI.  ACFT GROUNDED.   FOUND THE NR 1 ENGINE PRECOOLER CONTROL VALVE SUPPLY PRESSURE SENSE LINE BROKEN.  REMOVED AND REPLACED THE SENSE LINE IAW AMM 36-12-400-801, STEP 3. F. (9), AND (10).  ACCOMPLISHED INSTALLATION TEST IAW AMM 36-12-02-400-801 3. G THROUGH H (2). OPS AND LEAK CHECKED GOOD.  BOTH LEFT AND RIGHT PACK DUCT PRESSURE ARE NORMAL.

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