C550 crew had a cabin depressurization in cyyz class a.

Attributes
ACN	521816
Time
Date	200108
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : czyz.artcc
State Reference	ON
Altitude	msl bound lower : 31400 msl bound upper : 33000
Environment
Flight Conditions	VMC
Weather Elements	Ice
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : czyz.artcc artcc : zob.artcc tower : zzz.tower
Operator	general aviation : corporate
Make Model Name	Citation I/SP
Operating Under FAR Part	Part 91
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 110 flight time total : 5100 flight time type : 200
ASRS Report	521816
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : company policies non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : overrode automation flight crew : landed in emergency condition flight crew : declared emergency none taken : detected after the fact other
Factors
Maintenance	performance deficiency : non compliance with legal requirements performance deficiency : inspection
Supplementary
Problem Areas	Aircraft Company ATC Human Performance
Primary Problem	Company
Air Traffic Incident	Inter Facility Coordination Failure

Narrative:

On climb to FL330 at 31400 ft had loud pop and very loud air pressure noise from rear cabin area. Was reading back amended route clearance to toronto center at that time. Told center to standby, put on oxygen mask and asked for descent, 'emergency pressure' light on, ran checklist and followed items, got emergency pressure valve closed and remained at 15000 ft which was out of ice conditions. Continued to destination for customs. Next center asked if we were going to ashen intersection which was our amended clearance. We advised we were still direct to yxq, which we advised toronto center at the time of the problem we wanted to do (original clearance) until we had the problem fixed. Toronto must not have advised cleveland we had to track our present course as we didn't have time to re-navigation to new fix. Problem turned out to be a clogged acm due to paint chips (aircraft was being ferried from paint shop). Corrective action is better communication between center controllers and better vent covering during paint/strip process.

Original NASA ASRS Text

Title: C550 CREW HAD A CABIN DEPRESSURIZATION IN CYYZ CLASS A.

Narrative: ON CLB TO FL330 AT 31400 FT HAD LOUD POP AND VERY LOUD AIR PRESSURE NOISE FROM REAR CABIN AREA. WAS READING BACK AMENDED RTE CLRNC TO TORONTO CTR AT THAT TIME. TOLD CTR TO STANDBY, PUT ON OXYGEN MASK AND ASKED FOR DSCNT, 'EMER PRESSURE' LIGHT ON, RAN CHKLIST AND FOLLOWED ITEMS, GOT EMER PRESSURE VALVE CLOSED AND REMAINED AT 15000 FT WHICH WAS OUT OF ICE CONDITIONS. CONTINUED TO DEST FOR CUSTOMS. NEXT CTR ASKED IF WE WERE GOING TO ASHEN INTXN WHICH WAS OUR AMENDED CLRNC. WE ADVISED WE WERE STILL DIRECT TO YXQ, WHICH WE ADVISED TORONTO CTR AT THE TIME OF THE PROB WE WANTED TO DO (ORIGINAL CLRNC) UNTIL WE HAD THE PROB FIXED. TORONTO MUST NOT HAVE ADVISED CLEVELAND WE HAD TO TRACK OUR PRESENT COURSE AS WE DIDN'T HAVE TIME TO RE-NAV TO NEW FIX. PROB TURNED OUT TO BE A CLOGGED ACM DUE TO PAINT CHIPS (ACFT WAS BEING FERRIED FROM PAINT SHOP). CORRECTIVE ACTION IS BETTER COM BTWN CTR CTLRS AND BETTER VENT COVERING DURING PAINT/STRIP PROCESS.

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.