# SDR 99UAL900220

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N7285U
- Make and model: Boeing 727222
- Aircraft serial: 21563
- Engine: Pwa JT8D15
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Panel
- Condition: Malfunctioned
- Location: Cockpit
- Component: Hamilton Sta, 7110024
- Stage of operation: CR
- Nature of condition: O
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900220

## Discrepancy

CREW REPORTS AT 33,000 FEET THE CABIN PRESSURE BEGAN TO CLIMB TO 11,000 FEET.  MADE AN EMERGENCY DESCENT TO 24,000 FEET.  STANDBY OPERATION OK.  *SD*  REPLACED PRESSURE CONTROL PANEL.

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