# SDR COZA20200730131

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2020
- Submitted: July 30, 2020
- Operation: Air carrier
- Aircraft: N732KA
- Make and model: Boeing 737-59D
- Registry model: [Boeing 737-59D](https://openairdocs.org/model/boeing-737-59d) (OpenAirDocs)
- Aircraft serial: 25065
- Aircraft time: 46,023 hours, 39,505 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Check Valve
- Part number: 32022221
- Condition: Corroded
- Location: Engine
- Stage of operation: IN
- 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/COZA20200730131

## Discrepancy

ENGINE BLEED AIR 5TH STAGE CHECK VALVES ON BOTH ENGINES INSPECTED FOR EMERGENCY AD 2020-16-51.  BOTH CHECK VALVES SHOW SIGNS OF CORRODED FLAPPER PLATES, BUSHINGS AND WILL BE REPLACED.

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