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LR25 PIC report of a cabin pressurization problem. Either a malfunctioning system or someone overlooked the fact that the valve was shut off.
| Attributes | |
| ACN | 370729 |
| Time | |
| Date | 199705 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : gjt |
| State Reference | CO |
| Altitude | msl bound lower : 10000 msl bound upper : 41000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | general aviation : personal |
| Make Model Name | Learjet 25 |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 300 flight time total : 14000 flight time type : 30 |
| ASRS Report | 370729 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While climbing out of grand junction the pressurization valve was left off or switched off. Oxygen masks deployed, speed and altitude was a problem to maintain, initiated pressurization of cabin but had no luck. However, we maintained or were able to maintain the cabin around 11000-12000 ft. At times I had problems working the pressurization system and adhering to ATC directions. Finally managed to use the pressurization (emergency) system and bring the cabin down. The rest of the flight was uneventful.
Original NASA ASRS Text
Title: LR25 PIC RPT OF A CABIN PRESSURIZATION PROB. EITHER A MALFUNCTIONING SYS OR SOMEONE OVERLOOKED THE FACT THAT THE VALVE WAS SHUT OFF.
Narrative: WHILE CLBING OUT OF GRAND JUNCTION THE PRESSURIZATION VALVE WAS LEFT OFF OR SWITCHED OFF. OXYGEN MASKS DEPLOYED, SPD AND ALT WAS A PROB TO MAINTAIN, INITIATED PRESSURIZATION OF CABIN BUT HAD NO LUCK. HOWEVER, WE MAINTAINED OR WERE ABLE TO MAINTAIN THE CABIN AROUND 11000-12000 FT. AT TIMES I HAD PROBS WORKING THE PRESSURIZATION SYS AND ADHERING TO ATC DIRECTIONS. FINALLY MANAGED TO USE THE PRESSURIZATION (EMER) SYS AND BRING THE CABIN DOWN. THE REST OF THE FLT WAS UNEVENTFUL.
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.