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A CE550 flight crew making an emergency descent after suffering a loss of pressurization then--when they felt they had lost communication with ATC--compounded their problems by squawking the emergency transponder code instead of the lost com code.
| Attributes | |
| ACN | 920262 |
| Time | |
| Date | 201011 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Citation II S2/Bravo (C550) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Commercial |
| Experience | Flight Crew Last 90 Days 12 Flight Crew Total 810 Flight Crew Type 5 |
| Person 2 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 125 Flight Crew Total 7410 Flight Crew Type 30 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy |
Narrative:
While climbing through FL280 after being cleared to FL350 we had a loss of cabin pressure and started down prior to receiving an ATC clearance. I thought we had been cleared down and were cleared shortly after I initiated the descent. I misunderstood the other pilot while trying to address the situation. The number one com also malfunctioned and blocked out the controller right before pressurization problem and I accidentally used the hi-jack code instead of the lost communications code in the transponder. The original code for our IFR flight plan was reinitialized and we continued the flight.
Original NASA ASRS Text
Title: A CE550 Flight Crew making an emergency descent after suffering a loss of pressurization then--when they felt they had lost communication with ATC--compounded their problems by squawking the emergency transponder code instead of the lost com code.
Narrative: While climbing through FL280 after being cleared to FL350 we had a loss of cabin pressure and started down prior to receiving an ATC Clearance. I thought we had been cleared down and were cleared shortly after I initiated the descent. I misunderstood the other pilot while trying to address the situation. The Number One Com also malfunctioned and blocked out the Controller right before pressurization problem and I accidentally used the hi-jack code instead of the lost communications code in the transponder. The original code for our IFR flight plan was reinitialized and we continued the flight.
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.