HS800 flight crew has cabin depressurize while climbing. Declares an emergency and descends.

Attributes
ACN	689011
Time
Date	200602
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	general aviation : corporate
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Route In Use	departure sid : n/s
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 4500 flight time type : 2200
ASRS Report	689011
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin warning light other flight crewa
Resolutory Action	controller : provided flight assist flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Aircraft depressurized at FL220. Non explosive system failure. No definitive system failure noted in climb. At FL270; cabin light/horn came on. Started the emergency descent. ATC was notified of the emergency. By declaring the emergency; ATC stepped us down. We restated emergency aircraft identify -- they still stepped us down to 10000 ft. ATC very unwilling to assist in letting us down after declaring the emergency. It was a step descent.

Original NASA ASRS Text

Title: HS800 FLT CREW HAS CABIN DEPRESSURIZE WHILE CLBING. DECLARES AN EMER AND DSNDS.

Narrative: ACFT DEPRESSURIZED AT FL220. NON EXPLOSIVE SYS FAILURE. NO DEFINITIVE SYS FAILURE NOTED IN CLB. AT FL270; CABIN LIGHT/HORN CAME ON. STARTED THE EMER DSCNT. ATC WAS NOTIFIED OF THE EMER. BY DECLARING THE EMER; ATC STEPPED US DOWN. WE RESTATED EMER ACFT IDENT -- THEY STILL STEPPED US DOWN TO 10000 FT. ATC VERY UNWILLING TO ASSIST IN LETTING US DOWN AFTER DECLARING THE EMER. IT WAS A STEP DSCNT.

Data retrieved from NASA's ASRS site as of January 2009 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.