 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier medium large transport developed pressurization control problem at cruise altitude. Emergency declared.
| Attributes | |
| ACN | 102951 |
| Time | |
| Date | 198901 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : orl |
| State Reference | FL |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 15000 flight time type : 6000 |
| ASRS Report | 102951 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : overcame equipment problem flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
As we approached our cruising altitude of 33000' the cabin altitude warning horn sounded. The cabin altitude was 10000'+, both packs were operating in a normal confign. We declared an emergency (squawked 7700) and started our descent. The F/a's and passenger were briefed. Using both the manual and standby systems, we regained control of the system. A VFR approach and landing were made at mco. The pressurization controller (plus one other part) were replaced.
Original NASA ASRS Text
Title: ACR MLG DEVELOPED PRESSURIZATION CONTROL PROBLEM AT CRUISE ALT. EMERGENCY DECLARED.
Narrative: AS WE APCHED OUR CRUISING ALT OF 33000' THE CABIN ALT WARNING HORN SOUNDED. THE CABIN ALT WAS 10000'+, BOTH PACKS WERE OPERATING IN A NORMAL CONFIGN. WE DECLARED AN EMER (SQUAWKED 7700) AND STARTED OUR DSCNT. THE F/A'S AND PAX WERE BRIEFED. USING BOTH THE MANUAL AND STANDBY SYSTEMS, WE REGAINED CONTROL OF THE SYSTEM. A VFR APCH AND LNDG WERE MADE AT MCO. THE PRESSURIZATION CTLR (PLUS ONE OTHER PART) WERE REPLACED.
Data retrieved from NASA's ASRS site as of August 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.