A BE1900 developed a pressurization problem approaching its cruise altitude of FL220. A descent to 1...

Attributes
ACN	862014
Time
Date	200911
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	Climb Cruise Descent
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 1600 Flight Crew Type 700
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 201 Flight Crew Total 2638 Flight Crew Type 2100
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural FAR

Narrative:

During climb out we experienced a failure of part of the environmental system. After performing the memory items and the emergency checklist we decided that it was safe to continue to our destination. As we were climbing through FL200 we began experiencing a loss of cabin pressure. Once we leveled off at our assigned altitude of FL220; we requested lower. After conferring with our company dispatcher via our departure station we elected to return to our departure airport. Since we had already requested a lower altitude by the time the cabin altitude had exceeded 10;000 ft we invoked our emergency authority granted to us by the cfrs not to use supplemental oxygen as we were in a descent to a lower altitude. The passengers (4) were kept informed of our situation. ATC cleared us back to our departure airport and gave us 13;000. Shortly after we began descending the cabin altitude returned a lower value. Priority handling was not requested. All passengers and crew were safe.

Original NASA ASRS Text

Title: A BE1900 developed a pressurization problem approaching its cruise altitude of FL220. A descent to 10;000 FT was begun and the aircraft returned to the departure airport.

Narrative: During climb out we experienced a failure of part of the environmental system. After performing the memory items and the emergency checklist we decided that it was safe to continue to our destination. As we were climbing through FL200 we began experiencing a loss of cabin pressure. Once we leveled off at our assigned altitude of FL220; we requested lower. After conferring with our Company Dispatcher via our departure station we elected to return to our departure airport. Since we had already requested a lower altitude by the time the Cabin Altitude had exceeded 10;000 FT we invoked our emergency authority granted to us by the CFRs not to use supplemental oxygen as we were in a descent to a lower altitude. The passengers (4) were kept informed of our situation. ATC cleared us back to our departure airport and gave us 13;000. Shortly after we began descending the cabin altitude returned a lower value. Priority handling was not requested. All passengers and crew were safe.

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.

A BE1900 developed a pressurization problem approaching its cruise altitude of FL220. A descent to 10;000 ft was begun and the aircraft returned to the departure airport.