# SDR HAEA20180102001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 5, 2018
- Submitted: January 2, 2019
- Operation: Air carrier
- Aircraft: [N221TW](https://openairdocs.org/aircraft/N221TW), registered now
- Make and model: Amd FALCON20
- Aircraft serial: 221
- Aircraft time: 26,278 hours, 20,046 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Line
- Condition: Cracked
- Location: Outflow Vavle
- 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/HAEA20180102001

## Discrepancy

SUPPLEMENTAL INFORMATION. AIRCRAFT DEPARTED KFNT-KSHV AND WAS @ FL280 WHEN THE CABIN ALT WARNING HORN AND LIGHT ACTIVATED THE CREW STARTED THE CHECKLIST AND SELECTED CABIN PRESSURIZATION MANUAL MODE AND ATTEMPTED TO LOWER THE CABIN ALTITUDE WITH NO SUCCESS, AN EMERGENCY WAS DECLARED AND THEY DIVERTED TO KSBN. 2 LINES GOING TO THE PRESSURIZATION OUT FLOW VALVES WERE FOUND CRACKED, LINES HAVE BEEN REPLACED AND THE CABIN PRESSURIZATION SYSTEM HAS PASSED OPS CHECKS PER THE AMM.

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