# SDR SWAA2018082324548

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 21, 2018
- Submitted: August 23, 2018
- Operation: Air carrier
- Aircraft: N747SA
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 29799
- Aircraft time: 67,468 hours, 39,785 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator
- Part number: 1074847
- Part serial: 2760C
- Condition: Faulty
- Location: Bleed Air Sys
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2018082324548

## Discrepancy

AIR TURNBACK, DURING CLIMB OUT AT APPROXIMATELY 21,000 CABIN WARNING HORN CAME ON-CABIN APPROXIMATELY 10-11000FT.  DESCENDED AND RETURNED TO PHX.  R&R NR 1 ENGINE HIGH STAGE REGULATOR PER MM.

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