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Captain of unidentified aircraft type reports a gradual increase in cabin altitude during descent that is arrested by going to the manual pressurization mode.
| Attributes | |
| ACN | 802538 |
| Time | |
| Date | 200809 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : zzz.vor |
| State Reference | US |
| Altitude | msl single value : 19000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| 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 : 4000 flight time type : 1500 |
| ASRS Report | 802538 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : cabin alt warning other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On a descent from FL240 to 16000 ft; we got a cabin pressure master warning. I declared an emergency and ATC gave us 13500 ft for an altitude. The cabin pressure got to 12000 ft. It went below 10000 ft in a hurry because we got down in a hurry. The passenger never knew anything was wrong. From the time I got the light to after I ran the checklist; I never grabbed my mask because the cabin was pressurizing in manual mode. It wasn't a rapid depressurization.
Original NASA ASRS Text
Title: CAPTAIN OF UNIDENTIFIED ACFT TYPE REPORTS A GRADUAL INCREASE IN CABIN ALT DURING DESCENT THAT IS ARRESTED BY GOING TO THE MANUAL PRESSURIZATION MODE.
Narrative: ON A DSCNT FROM FL240 TO 16000 FT; WE GOT A CABIN PRESSURE MASTER WARNING. I DECLARED AN EMER AND ATC GAVE US 13500 FT FOR AN ALT. THE CABIN PRESSURE GOT TO 12000 FT. IT WENT BELOW 10000 FT IN A HURRY BECAUSE WE GOT DOWN IN A HURRY. THE PAX NEVER KNEW ANYTHING WAS WRONG. FROM THE TIME I GOT THE LIGHT TO AFTER I RAN THE CHKLIST; I NEVER GRABBED MY MASK BECAUSE THE CABIN WAS PRESSURIZING IN MANUAL MODE. IT WASN'T A RAPID DEPRESSURIZATION.
Data retrieved from NASA's ASRS site as of May 2009 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.