# SDR ASAA2019052429486

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 24, 2019
- Submitted: May 28, 2019
- Operation: Air carrier
- Aircraft: [N461AS](https://openairdocs.org/aircraft/N461AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36363
- Aircraft time: 20,665 hours, 6,712 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 632921461
- Part serial: 2072
- Condition: Failed
- Location: Bleed Air Sys
- Part time: 6,435 hours, 2,050 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/ASAA2019052429486

## Discrepancy

DUCT PRESSURE DURING T/O AND CLIMB, UNTIL LEVEL @ 32,000 RT 43 LEFT 20 PSI. AT CRUISE LEFT 30 RT 39. GROUNDED - YES. COMPLETED TASK CARD# NG-36WC-00001: NR 1 ENGINE BLEED AIR HEALTH CHECK STEPS 1-5. REMOVED AND REPLACED PRE-COOLER CONTROL VALVE REF AMM 36-12-02-000-801 AND AMM 36-12-02-400-801. BLEED CROSS OVER OPTS TEST REQUIRED. BLEED AIR HEALTH CHECK GOOD REF AMM 36-11-00-710-801. NO FURTHER DEFECTS NOTED.

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