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Flight crew of an large transport air carrier aircraft made an emergency descent due to a loss of aircraft pressurization.
| Attributes | |
| ACN | 253977 |
| Time | |
| Date | 199310 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 26000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent 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 : 200 flight time total : 17500 flight time type : 1100 |
| ASRS Report | 253977 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
The aircraft had 1 air conditioning pack on mco and 1 automatic pressure controller on mco. Flight was normal at 31000 ft in cruise. On descent at about 26000 ft, the cabin pressure warning light and horn sounded and we noticed the cabin had gone to 12000 ft and was slowly climbing. As PF, I accelerated the descent and got ATC clearance to 10000 ft. The cabin was run down by the copilot using manual system. The descent was smooth and at 10000 the cabin stabilized and the approach and landing at den were normal. Apparent problem was failure of the remaining automatic-pressure controller coupled with the 1 of 2 air conditioning packs being inoperative not being able to either control or maintain normal cabin pressure.
Original NASA ASRS Text
Title: FLC OF AN LGT ACR ACFT MADE AN EMER DSCNT DUE TO A LOSS OF ACFT PRESSURIZATION.
Narrative: THE ACFT HAD 1 AIR CONDITIONING PACK ON MCO AND 1 AUTO PRESSURE CTLR ON MCO. FLT WAS NORMAL AT 31000 FT IN CRUISE. ON DSCNT AT ABOUT 26000 FT, THE CABIN PRESSURE WARNING LIGHT AND HORN SOUNDED AND WE NOTICED THE CABIN HAD GONE TO 12000 FT AND WAS SLOWLY CLBING. AS PF, I ACCELERATED THE DSCNT AND GOT ATC CLRNC TO 10000 FT. THE CABIN WAS RUN DOWN BY THE COPLT USING MANUAL SYS. THE DSCNT WAS SMOOTH AND AT 10000 THE CABIN STABILIZED AND THE APCH AND LNDG AT DEN WERE NORMAL. APPARENT PROB WAS FAILURE OF THE REMAINING AUTO-PRESSURE CTLR COUPLED WITH THE 1 OF 2 AIR CONDITIONING PACKS BEING INOP NOT BEING ABLE TO EITHER CTL OR MAINTAIN NORMAL CABIN PRESSURE.
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.