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A C525 climbed through FL180 when the cabin altitude warning alerted the cabin above 10;000 ft because after maintenance the engine bleed valves were not opened. An emergency was declared and a descent accomplished during which he found the oxygen masks disconnected.
| Attributes | |
| ACN | 952732 |
| Time | |
| Date | 201105 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citationjet (C525/C526) - CJ I / II / III / IV |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pneumatic Valve/Bleed Valve |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 35 Flight Crew Total 7000 Flight Crew Type 5000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Other / Unknown |
Narrative:
I was returning after maintenance. As I climbed through 18;000 ft the red cabin pressure greater than 10;000 ft warning light came on. I declared emergency descent and was cleared without apparent conflict. On checking; found the repair facility had turned air intake from 'both' to 'off.' also discovered they had detached oxygen masks from oxygen outlet. I thought I had checked everything; but now I will be more vigilant. Door seals must be very tight as pressure only rose to 11;000 ft in aircraft.
Original NASA ASRS Text
Title: A C525 climbed through FL180 when the Cabin Altitude Warning alerted the cabin above 10;000 FT because after maintenance the engine bleed valves were not opened. An emergency was declared and a descent accomplished during which he found the oxygen masks disconnected.
Narrative: I was returning after maintenance. As I climbed through 18;000 FT the red cabin pressure greater than 10;000 FT warning light came on. I declared emergency descent and was cleared without apparent conflict. On checking; found the repair facility had turned air intake from 'BOTH' to 'OFF.' Also discovered they had detached oxygen masks from oxygen outlet. I thought I had checked everything; but now I will be more vigilant. Door seals must be very tight as pressure only rose to 11;000 FT in aircraft.
Data retrieved from NASA's ASRS site as of April 2012 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.