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Flight crew of an medium large transport air carrier aircraft made an emergency descent due to cabin pressurization loss.
| Attributes | |
| ACN | 253791 |
| Time | |
| Date | 199310 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : emg |
| State Reference | LA |
| Altitude | msl bound lower : 14000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 4000 flight time type : 140 |
| ASRS Report | 253791 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| 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:
Emergency descent following rapid cabin depressurization. At FL370 in cruise outside air temperature approximately minus 23 (ram) in light icing conditions, engine and wing (tail) anti-ice in use. Heard 2 aircraft ahead (medium large transport's) discuss pressure problems with ATC. Soon after our flow light illuminated, pack flow gauges indicated low flow, cabin was at 9000 ft and climbing 400-500 FPM. We donned oxygen mask and started emergency descent from FL370. Cabin altitude warning light illuminated shortly thereafter, followed by master warning lights. At FL180 aircraft broke out of IMC into VMC and cabin altitude started to descend again. We leveled at 14000 ft and continued flight with no further incident. Flight was (flight number). The two medium large transport's ahead with same problem were other air carrier's.
Original NASA ASRS Text
Title: FLC OF AN MLG ACR ACFT MADE AN EMER DSCNT DUE TO CABIN PRESSURIZATION LOSS.
Narrative: EMER DSCNT FOLLOWING RAPID CABIN DEPRESSURIZATION. AT FL370 IN CRUISE OUTSIDE AIR TEMP APPROX MINUS 23 (RAM) IN LIGHT ICING CONDITIONS, ENG AND WING (TAIL) ANTI-ICE IN USE. HEARD 2 ACFT AHEAD (MLG'S) DISCUSS PRESSURE PROBS WITH ATC. SOON AFTER OUR FLOW LIGHT ILLUMINATED, PACK FLOW GAUGES INDICATED LOW FLOW, CABIN WAS AT 9000 FT AND CLBING 400-500 FPM. WE DONNED OXYGEN MASK AND STARTED EMER DSCNT FROM FL370. CABIN ALT WARNING LIGHT ILLUMINATED SHORTLY THEREAFTER, FOLLOWED BY MASTER WARNING LIGHTS. AT FL180 ACFT BROKE OUT OF IMC INTO VMC AND CABIN ALT STARTED TO DSND AGAIN. WE LEVELED AT 14000 FT AND CONTINUED FLT WITH NO FURTHER INCIDENT. FLT WAS (FLT NUMBER). THE TWO MLG'S AHEAD WITH SAME PROB WERE OTHER ACR'S.
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.