# SDR 99UAL900542

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N7278U
- Make and model: Boeing 727222
- Aircraft serial: 21425
- Engine: Pwa JT8D15
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Warning Horn
- Condition: Activated
- Location: Cockpit
- Stage of operation: CR
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900542

## Discrepancy

FLIGHT HAD ALTITUDE WARNING HORN.  MADE AN EMERGENCY DESCENT TO 10,000  FEET.  STANDBY CABIN PRESSURE WAS SELECTED.  FLIGHT CONTINUED ON TO JAX.  *S/D*  NO PROBABLE CAUSE WAS DETECTED.  A PRESSURIZATION CONTROL TEST WAS ACCOMPLISHED AND SYSTEM CHECKED OUT OK.

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