F100 crew was unable to pressurize the cabin in D01 class B airspace.

Attributes
ACN	501262
Time
Date	200102
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dal.airport
State Reference	TX
Altitude	msl single value : 9000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	other
Route In Use	departure sid : dal
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	501262
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin rate of climb. eicas warning msgs. other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Unable to pressurize on climb. On climb out we received cabin pressure control channel 1 message. Several mins later, we received cabin pressure control channel 2 message, followed by cabin pressure control channel message. We followed checklist procedures and tried to apply manual pressurization procedures. The cabin continued to climb about 850 FPM. We leveled the aircraft at 9000 ft. Contacted dal operations and dispatch and were instructed to return to dal. We declared an emergency and slowly descended for approach and landing. A normal landing at dal was made with a landing weight of about 72000 pounds.

Original NASA ASRS Text

Title: F100 CREW WAS UNABLE TO PRESSURIZE THE CABIN IN D01 CLASS B AIRSPACE.

Narrative: UNABLE TO PRESSURIZE ON CLB. ON CLBOUT WE RECEIVED CABIN PRESSURE CTL CHANNEL 1 MESSAGE. SEVERAL MINS LATER, WE RECEIVED CABIN PRESSURE CTL CHANNEL 2 MESSAGE, FOLLOWED BY CABIN PRESSURE CTL CHANNEL MESSAGE. WE FOLLOWED CHKLIST PROCS AND TRIED TO APPLY MANUAL PRESSURIZATION PROCS. THE CABIN CONTINUED TO CLB ABOUT 850 FPM. WE LEVELED THE ACFT AT 9000 FT. CONTACTED DAL OPS AND DISPATCH AND WERE INSTRUCTED TO RETURN TO DAL. WE DECLARED AN EMER AND SLOWLY DSNDED FOR APCH AND LNDG. A NORMAL LNDG AT DAL WAS MADE WITH A LNDG WT OF ABOUT 72000 LBS.

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.