A BAE125-800 at FL248 declared an emergency and diverted due to loss of cabin pressure.

Attributes
ACN	619774
Time
Date	200405
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : psp.airport
State Reference	CA
Altitude	msl single value : 24800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc tower : zzz.tower
Operator	general aviation : personal
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : atp pilot : instrument pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 5000 flight time type : 2000
ASRS Report	619774
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude
Independent Detector	aircraft equipment other aircraft equipment : cabin press indicator other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

During en route climb through FL248 from psp, the cabin altitude climb rate increased to 3000 FPM then to 5000 FPM. Rapidly approaching maximum cabin differential, the PF (sic) executed an emergency descent (we declared with ATC). We donned the oxygen mask and descended to 12000 ft. The PNF (PIC) called ZLA and declared an emergency. Upon descent, reaching 12000 ft, the PIC gave ATC the pertinent information required by ATC and returned to psp. No injuries to the crew, and no damage to the aircraft that can be determined by crew. All other system on the aircraft worked normal. Callback conversation with reporter revealed the following information: the reporter stated after arrival at the diversion station, passenger and crew were switched to another airplane and no maintenance data was available.

Original NASA ASRS Text

Title: A BAE125-800 AT FL248 DECLARED AN EMER AND DIVERTED DUE TO LOSS OF CABIN PRESSURE.

Narrative: DURING ENRTE CLB THROUGH FL248 FROM PSP, THE CABIN ALT CLB RATE INCREASED TO 3000 FPM THEN TO 5000 FPM. RAPIDLY APCHING MAX CABIN DIFFERENTIAL, THE PF (SIC) EXECUTED AN EMER DSCNT (WE DECLARED WITH ATC). WE DONNED THE OXYGEN MASK AND DSNDED TO 12000 FT. THE PNF (PIC) CALLED ZLA AND DECLARED AN EMER. UPON DSCNT, REACHING 12000 FT, THE PIC GAVE ATC THE PERTINENT INFO REQUIRED BY ATC AND RETURNED TO PSP. NO INJURIES TO THE CREW, AND NO DAMAGE TO THE ACFT THAT CAN BE DETERMINED BY CREW. ALL OTHER SYS ON THE ACFT WORKED NORMAL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED AFTER ARR AT THE DIVERSION STATION, PAX AND CREW WERE SWITCHED TO ANOTHER AIRPLANE AND NO MAINT DATA WAS AVAILABLE.

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.