# SDR FDEA202207231791

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 23, 2022
- Submitted: July 25, 2022
- Operation: Air carrier
- Aircraft: [N947FD](https://openairdocs.org/aircraft/N947FD), registered now
- Make and model: Boeing 757
- Aircraft serial: 24882
- Aircraft time: 59,818 hours, 30,092 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Duct
- Condition: Failed
- Component: None
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA202207231791

## Discrepancy

PDIS  947     21-30  0875     22JUL22  PHL  FACT  U  CABIN ALT MASTER WARNING AT FL350. C/W QRH  CONTINUED CRUISE AT FL250 WITH CABIN ALT AT 8500.  EMER DECL, ALSO TRIED ALT AUTO MODE WITH NO CHANGE  ***EMERGENCY DECLARED***   FACT 23JUL22 15:06   PHL U  REPLACED LEFT PACK WATER SEPERATOR DUCT IAW AMM  21-51-04-4. RAN ENGINE IAW B757 QRH/ MM  71-00-00-865    PERFORMED PRESSURIZATION TEST IAW  AMM 21-31-00-5 SYSTEM TEST NORMAL NO FAULTS, A/C OK  FOR SERVICE

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