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Loss of the pressurization system forced the aircraft to descend. During the descent the aircraft was below the minimum en route altitude for AR7.
| Attributes | |
| ACN | 429735 |
| Time | |
| Date | 199902 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : panal |
| State Reference | US |
| Altitude | msl bound lower : 12000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | general aviation : corporate |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 3000 flight time type : 2000 |
| ASRS Report | 429735 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On feb/xa/99 at approximately XX30Z above a warning area near panal intersection off the east coast of united states, our aircraft started to develop a pressurization problem. We were told to change our transponder code to 7700, which we did and descended to 12000 ft. Soon thereafter, the aircraft's pressurization problem started to work normally so we elected to climb up to our normal altitude for the remainder of the flight. Due to our cabin's altitude rising slowly, we had to descend into the warning area. We did our emergency checklist on descent and had no problems for the rest of the flight.
Original NASA ASRS Text
Title: LOSS OF THE PRESSURIZATION SYS FORCED THE ACFT TO DSND. DURING THE DSCNT THE ACFT WAS BELOW THE MINIMUM ENRTE ALT FOR AR7.
Narrative: ON FEB/XA/99 AT APPROX XX30Z ABOVE A WARNING AREA NEAR PANAL INTXN OFF THE EAST COAST OF UNITED STATES, OUR ACFT STARTED TO DEVELOP A PRESSURIZATION PROB. WE WERE TOLD TO CHANGE OUR XPONDER CODE TO 7700, WHICH WE DID AND DSNDED TO 12000 FT. SOON THEREAFTER, THE ACFT'S PRESSURIZATION PROB STARTED TO WORK NORMALLY SO WE ELECTED TO CLB UP TO OUR NORMAL ALT FOR THE REMAINDER OF THE FLT. DUE TO OUR CABIN'S ALT RISING SLOWLY, WE HAD TO DSND INTO THE WARNING AREA. WE DID OUR EMER CHKLIST ON DSCNT AND HAD NO PROBS FOR THE REST OF THE FLT.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.