An air carrier F 100 crew lost their pressurization.

Attributes
ACN	261715
Time
Date	199401
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dbq
State Reference	IA
Altitude	msl bound lower : 10000 msl bound upper : 26000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8000 flight time type : 380
ASRS Report	261715
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 1900 flight time type : 300
ASRS Report	261708
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Climbing out of ord through FL260 for FL280 experienced a rapid depressurization. Immediately asked ZAU for 10000 ft. Their reply was to stand by. Once we stopped the climb and started a descent after approximately 10 seconds the controller cleared us to 10000 ft. TCASII was operating normally. Supplemental information from acn 261708: conditions when we departed ord were -15 degrees F in clear skies. Our ear's attempts at pressure equalization alerted us to a possible pressurization problem. The cabin was climbing at 1000 FPM with pressure surges both visible on the gauge and felt physically in the ears. I believe the extreme cold in chicago may have caused the cabin outflow valves to freeze contributing to the pressurization problem.

Original NASA ASRS Text

Title: AN ACR F 100 CREW LOST THEIR PRESSURIZATION.

Narrative: CLBING OUT OF ORD THROUGH FL260 FOR FL280 EXPERIENCED A RAPID DEPRESSURIZATION. IMMEDIATELY ASKED ZAU FOR 10000 FT. THEIR REPLY WAS TO STAND BY. ONCE WE STOPPED THE CLB AND STARTED A DSCNT AFTER APPROX 10 SECONDS THE CTLR CLRED US TO 10000 FT. TCASII WAS OPERATING NORMALLY. SUPPLEMENTAL INFO FROM ACN 261708: CONDITIONS WHEN WE DEPARTED ORD WERE -15 DEGS F IN CLR SKIES. OUR EAR'S ATTEMPTS AT PRESSURE EQUALIZATION ALERTED US TO A POSSIBLE PRESSURIZATION PROB. THE CABIN WAS CLBING AT 1000 FPM WITH PRESSURE SURGES BOTH VISIBLE ON THE GAUGE AND FELT PHYSICALLY IN THE EARS. I BELIEVE THE EXTREME COLD IN CHICAGO MAY HAVE CAUSED THE CABIN OUTFLOW VALVES TO FREEZE CONTRIBUTING TO THE PRESSURIZATION PROB.

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.