A HS125-600A PIC exercises his emergency authority during a descent out of FL300 when the aircraft's pressurization sytem is accidentally turned off 30 south of yeg, ab.

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Attributes
ACN	524497
Time
Date	200109
Day	Tue
Place
Locale Reference	airport : cyeg.airport
State Reference	AB
Altitude	msl single value : 30000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : czeg.artcc
Operator	general aviation : corporate
Make Model Name	HS 125 Series 1-600
Operating Under FAR Part	Part 91
Navigation In Use	other other vortac
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute other
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 45 flight time total : 10677 flight time type : 650
ASRS Report	524497
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : exited adverse environment flight crew : overcame equipment problem flight crew : declared emergency other
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Climbing thru FL300 for FL330, I got out of the left seat to recover our enroute chart which had fallen into the aisle, upon reentering the cockpit, my head brushed the overhead panel and turned off the air valves. I got back in the seat and buckled in before the loss of pressure became noticeable. At the time we noticed the pressure loss the cabin was climbing thru 1200 ft. At the time I assumed control of the aircraft and instructed the first officer to squawk 7700. The reason for me taking control is that the transponder is located on the co-pilots side panel and I needed him to make the change as the frequency, was very congested. When we got below 10000 ft and leveled out, I had a chance to troubleshoot, and noticed both air valves in the off position. I turned them on and the aircraft re-pressurized. Later on the ground, we tried to duplicate the problem and found that when I enter the cockpit; my head is just below the air valves. As I don't get out of the cockpit that much, I have never had this problem before in this six years we have had this aircraft. When the aircraft re-pressurized, I cancelled the emergency and continued on our flight to cyoj.

Original NASA ASRS Text

Title: A HS125-600A PIC EXERCISES HIS EMER AUTHORITY DURING A DESCENT OUT OF FL300 WHEN THE ACFT'S PRESSURIZATION SYTEM IS ACCIDENTALLY TURNED OFF 30 SOUTH OF YEG, AB.

Narrative: CLBING THRU FL300 FOR FL330, I GOT OUT OF THE LEFT SEAT TO RECOVER OUR ENROUTE CHART WHICH HAD FALLEN INTO THE AISLE, UPON REENTERING THE COCKPIT, MY HEAD BRUSHED THE OVERHEAD PANEL AND TURNED OFF THE AIR VALVES. I GOT BACK IN THE SEAT AND BUCKLED IN BEFORE THE LOSS OF PRESSURE BECAME NOTICEABLE. AT THE TIME WE NOTICED THE PRESSURE LOSS THE CABIN WAS CLBING THRU 1200 FT. AT THE TIME I ASSUMED CTL OF THE ACFT AND INSTRUCTED THE FO TO SQUAWK 7700. THE REASON FOR ME TAKING CTL IS THAT THE TRANSPONDER IS LOCATED ON THE CO-PLTS SIDE PANEL AND I NEEDED HIM TO MAKE THE CHANGE AS THE FREQ, WAS VERY CONGESTED. WHEN WE GOT BELOW 10000 FT AND LEVELED OUT, I HAD A CHANCE TO TROUBLESHOOT, AND NOTICED BOTH AIR VALVES IN THE OFF POSITION. I TURNED THEM ON AND THE ACFT RE-PRESSURIZED. LATER ON THE GND, WE TRIED TO DUPLICATE THE PROBLEM AND FOUND THAT WHEN I ENTER THE COCKPIT; MY HEAD IS JUST BELOW THE AIR VALVES. AS I DON'T GET OUT OF THE COCKPIT THAT MUCH, I HAVE NEVER HAD THIS PROBLEM BEFORE IN THIS SIX YEARS WE HAVE HAD THIS ACFT. WHEN THE ACFT RE-PRESSURIZED, I CANCELLED THE EMER AND CONTINUED ON OUR FLT TO CYOJ.

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.